KR102336536B1 - Reuse System of Wastewater - Google Patents

Abstract

The present invention relates to a system for treating and reusing wastewater, and more specifically, to a system for treating and reusing wastewater, in which when the wastewater is difficult to decompose, an installation area of the system is narrow, or a rapid wastewater treatment is required, raw water flowing from an inflow water tank to a circulation tank is electrocoagulated and treated water is recycled to pass through a pH adjustment tank, a settling tank, an outflow tank, and a filtration tank, an efficiency of removing contaminants is increased by forming a powder electrode with zero-valent iron that causes oxidation and reduction reactions without applying electric energy, a specific surface area relative to a volume is maximized to ensure rapid cohesive reactivity even with low energy use, the contaminants is removed from an organic matter to a heavy metal in one process, and also the wastewater is treated in an environmentally and friendly way without adding additional chemicals for pH correction.

Description

Reuse System of Wastewater

The present invention relates to a wastewater treatment and reuse system, and more particularly, when difficult to decompose, a microbial method is difficult to apply, a small installation area, or a rapid wastewater treatment is required, the raw water introduced from the influent tank to the circulation tank is electrically coagulated and treated water By recirculating and passing through the PH control tank, settling tank, outflow tank and filtration tank, zero-valent iron that induces oxidation and reduction reactions without electric energy is formed as a powder electrode, increasing the efficiency of pollutant removal and specific surface area to volume A wastewater treatment reuse system that not only removes contaminants from organic matter to heavy metals in a single process, but also treats wastewater in an environmentally friendly way without adding additional chemicals for pH correction. is about

In general, water treatment technology is divided into physical, chemical, and biological treatment according to the treatment method. Primary treatment refers to physical treatment, and secondary treatment refers to chemical treatment and biological treatment. And tertiary treatment refers to all of the physical, chemical, and biological treatment in a high-level treatment method.

For each contaminant, natural separated substances are removed by physical treatment, water-soluble contaminants and colloidal particles are removed by chemical and biological treatment, and nitrogen, phosphorus, trace organic and inorganic substances are removed by biological treatment or advanced treatment such as separation membrane. do.

In domestic sewage, nitrogen, phosphorus, and organic matter are removed by the activated sludge method by microorganisms, and in industrial wastewater, a water-soluble metal salt is added to heavy metal-containing wastewater to adjust the pH using caustic soda or slaked lime, and a polymer coagulant is added to remove metals. Hydroxide is formed and it is removed by flotation or sedimentation to form sludge.

This water treatment method requires a large facility area to secure the treatment time (around 15 hours), and the flexible response is limited when the amount of wastewater increases or decreases intermittently. there is

Such a water treatment method has been converted from a chemical treatment method to a biological treatment method that can reduce the use of chemicals, but in the case of hard-to-decompose wastewater, a physicochemical pretreatment process is required. .

The method used to increase oxidative power compared to general chemical treatment is the Advanced Oxidation Process (AOP), which oxidizes organic substances and difficult-to-decompose substances, which are pollutants in water, by generating OH radicals with strong oxidizing power in water. It is an advanced chemical treatment method, and if we look at the advanced oxidation methods that have been widely used in Korea, there are Fenton oxidation method, ozone oxidation method, photocatalytic oxidation method, electron beam oxidation method, etc.

These advanced oxidation methods are very effective in oxidizing organic matter because they use OH radicals with strong oxidizing power as an oxidizing agent compared to conventional chemical treatment methods, but each method has many disadvantages compared to its own performance.

For example, the Fenton oxidation method using chemicals has concerns about maintenance costs and secondary pollution sources due to the use of chemicals. There is the problem of risk in management.

The development of a technology that can overcome these problems as much as possible and completely treat organic matter and difficult-to-decompose substances is an essential research task for the protection of water resources, which is rapidly deteriorating due to rapid industrialization. There is a need for economical wastewater treatment technology that has no concerns and is easy to maintain.

On the other hand, in the electrocoagulation method, when an electric current is supplied, metal ions are eluted from the electrode plate, aggregated and adsorbed with contaminants in wastewater, and the contaminants are removed by floating or precipitating by hydrogen and chlorine gas.

In the electrocoagulation principle, oxygen is generated at the anode and the anode electrode, and various oxidation reactions such as the indirect oxidation of nitrous acid and nitric acid become active due to the oxidation of organic substances such as SS, TDS, and TOC, oxidation of nitrogen compounds, and the generation of hypochlorous acid depending on the water quality. , the reduction electrode generates hydrogen and converts the ammonia component to the form of nitrous acid and nitric acid by producing hydroxyl radicals, and reduces heavy metal ions and phosphorus compounds to precipitate and remove them in the form of hydroxides. Iron ions attach to the fine particles and lose charge and are neutralized, while giving polarity to the fine particles and causing the particles to grow, causing agglomeration effect. )3, heavy metals, or phosphorus compounds are combined to form harmless hydroxides.

This electrocoagulation method has the advantages of a wide range of applications for the removal of various contaminants such as heavy metals in addition to organic matter, a fast processing speed, excellent processing efficiency, a small installation area, and a simple process.

However, since the conventional electrocoagulation method is a method of simply arranging a plurality of electrodes and then passing the treated water, there is a problem in that the overall water treatment efficiency is lowered.

In order to solve this problem, a wastewater treatment apparatus using Korean Patent No. 10-1221565 electrocoagulation is introduced by injecting a certain amount of an inorganic or organic coagulant into the wastewater flowing into the reaction chamber, or by mixing an inorganic coagulant and an organic coagulant. Thus, the formation of flocs was improved to further improve the flocculation rate, but by injecting chemicals, it is difficult to reuse the sediment, so it cannot be discharged, and the sediment has to be disposed of.

In addition, in the conventional wastewater treatment device using electrocoagulation, the efficiency of the electrode deteriorates the more it is used, and the efficiency is lowered due to the hard material sticking to the anode. There is a downside to growing.

On the other hand, in the case of electrocoagulation, when the fixing device for fixing the electrode is installed in the reaction tank, first, the raw water flowing through the outer interface of the electrode installed at the both ends of the fixing device goes to the next process without the electrocoagulation process, and secondly, between the fixing device If there is a tolerance, the raw water is not treated in the electrocoagulation process but goes directly to the next process, and the quality of the treated water deteriorates. have.

KR 10-1221565 (registration number) 2013.01.07. KR 10-1144857 (registration number) 2012.05.03. KR 10-1008400 (registration number) 2011.01.07.

The present invention is to solve the conventional problems as described above,

When the microbial method is difficult to apply, the installation area is narrow, or a rapid wastewater treatment is required, the raw water flowing from the influent tank to the circulation tank is electrocoagulated and the treated water is recirculated. , it increases the efficiency of removing contaminants by forming a powder electrode that causes oxidation and reduction reactions without applying electric energy. It aims to provide a wastewater treatment reuse system that not only removes contaminants up to heavy metals in one process but also treats wastewater in an environmentally friendly way without adding additional chemicals for pH correction.

It is an object of the present invention to widely remove organic and inorganic pollutants, separate them into non-toxic metal oxides, reduce installation and operating costs, as well as increase the removal rate of pollutants from specific wastewater, and provide electricity from water at the electrode interface. An object of the present invention is to provide a wastewater treatment reuse system that produces OH radicals through decomposition and has a sterilizing effect.

Another object of the present invention is to eliminate the need for chemical addition other than pH correction, which is rarely selected to remove trace amounts of residual iron ions that may exist in treated water, to reduce production through sludge optimization, and to simultaneously treat various contaminants. It is to provide a wastewater treatment reuse system.

Another object of the present invention is that raw water flowing from the influent tank to the circulation tank moves from the bottom to the top, passes through the electrocoagulation section where the electrocoagulation occurs between the powder electrodes, and moves to the circulation section, but the scum floating on the top is transferred to the scum chamber The sediment sinking to the bottom is discharged to the sediment outlet, and the treated water that has not been transferred to the supernatant inlet is sucked by the circulation pump and transferred back to the electric coagulation section. The goal is to provide a wastewater treatment reuse system that can mix water and wastewater evenly, as well as increase energy efficiency and lifespan of electrodes.

Another object of the present invention is a powder electrode that is formed in a rectangular parallelepiped shape by pressing porous powdered iron, and is dissolved by aggregating contaminants contained in influent water supplied from the outside using the principle of electrical coagulation, and electricity is applied to the powder electrode. The electrode terminal connecting rod for supplying is inserted and fixed, and an inflow groove is formed so that the inflow water passes between the powder electrodes from the lower surface, and the electrode terminal connecting rod is installed to be positioned higher than the powder electrode, and contaminants from the powder electrode are removed from the powder electrode on the upper side. An object of the present invention is to provide a wastewater treatment reuse system that uniformly treats inflow water and increases water treatment efficiency by inserting a powder electrode fixing device comprising a holder having a treated water discharge groove through which the removed treated water is discharged into the electrical coagulation section of the circulation tank.

Another object of the present invention is to ensure the stability of the reaction by supplying the diluted treated water through the electrocoagulation section first in the circulation tank to the electrocoagulation section in which raw water is introduced, so as to have sufficient contact time with the powder electrode, , to provide a wastewater treatment reuse system that can more efficiently mix raw water and treated water by controlling the flow rate of treated water discharged from the recirculation suction pipe to the electrocoagulation section according to the quality of the raw water.

Another object of the present invention is to provide a wastewater treatment reuse system capable of continuously treating sewage and wastewater by adjusting the number of powder electrodes, applied current, and flow rate per minute according to the daily treatment capacity.

Another object of the present invention is to insert the powder electrode fixing device into the electric coagulation section of the circulation tank, and to arrange and combine other powder electrode fixing devices and other powder electrode fixing devices in front and back faces to contact each other, and to put a plurality of powder electrode fixing devices in the upper part of the plurality of powder electrode fixing devices arranged in parallel. It is to provide a wastewater treatment reuse system that can treat a large amount of sewage and wastewater by controlling the size of a circulation tank that is connected to the electrode terminal of the bus bar and supplies electricity from the bus bar to collect electricity.

Another object of the present invention is to provide a wastewater treatment reuse system that can maintain the same distance between powder electrodes even when a plurality of powder electrode fixing devices are arranged side by side in the electrocoagulation section of a circulation tank so that the electrocoagulation reaction is uniformly performed is doing

Another object of the present invention is that the inflow water flowing through the inflow grooves formed at regular intervals on the lower surface of the powder electrode fixing device rises along the stacked-accommodated powder electrode, the powder electrode is uniformly dissolved, and the distance between the powder electrodes is increased. It is to provide a wastewater treatment reuse system that can easily know when to replace the powder electrode so that the voltage is high and the powder electrode can be replaced.

Another object of the present invention is that a powder electrode is stacked and inserted into the holder into which the electrode terminal connection rod is inserted, and a spacer is inserted so that the powder electrode contacts the electrode rod of the electrode terminal connection rod, thereby stably supplying electricity from the electrode terminal connection rod to the powder electrode. To provide a wastewater treatment reuse system in which the lower surface of the holder is slidably and detachably installed from both sides to facilitate replacement of the powder electrode.

Another object of the present invention is that it is possible to reuse the treated water to industrial water, agricultural water, or raw water by not using chemicals, and the use of the powder electrode reduces electricity consumption and lengthens the life of the powder electrode and eliminates the need for electrode cleaning. In addition, it is to provide a wastewater treatment reuse system with excellent coagulation effect.

Another object of the present invention is a powder electrode To provide a wastewater treatment reuse system that can be managed easily and cleanly by periodically switching the cathode and anode of the electrode terminal connector that supplies electricity to generate hydrogen gas on the surface of the powder electrode and to prevent sticking.

The present invention includes an influent tank 100 in which raw water is stored, the raw water supply pipe 110 is coupled, and the raw water supply pump 111 is connected to the raw water supply pipe 110 to supply raw water to the next processing process; a circulation tank 200 provided as a reaction tank in which electrical coagulation of raw water supplied through the raw water supply pipe 110 and circulation of treated water are made; a PH adjusting tank 300 connected to the circulation tank 200 and the supernatant water discharge pipe 310 to adjust the pH of the supernatant water; a sedimentation tank 400 in which sludge is precipitated from the treated water transferred from the PH adjustment tank 300; an outlet tank 500 comprising a discharge tank into which the supernatant water transferred from the settling tank 400 flows; a filtration tank 600 for filtering the effluent discharged from the outlet tank 500 with a filter; and a sludge tank 700 into which the sludge transferred from the circulation tank 200 and the settling tank 400 is introduced and concentrated.

The circulation tank 200 of the present invention has an open top, and a raw water supply pipe 110 is connected to the upper side of one side to form a raw water inlet 201 through which raw water is introduced, and a supernatant water discharge pipe 310 is formed on the opposite side. ) and the supernatant water outlet 202 connected to is formed of a reaction tank; The raw water is introduced from the lower part by the first partition wall 203 spaced apart from the raw water inlet 201, the powder electrode fixing device 210 is inserted and mounted, and the electric coagulation section is performed by the supply of electricity ( 220) and; The treated water that has passed through the electrical coagulation section 220 is transferred from the upper part of the second bulkhead 204, the scum floats at the upper part, and the sediment is discharged to the lower sediment outlet 205, and the treated water is recycled. a circulation section 230 consisting of a ration tank; A scum chamber 130 provided with a plate in the front in the upper part of the circulation section 120, having a higher height than the plate in the rear, and preventing supernatant water from being discharged by the clogged diaphragm 141; a supernatant water inlet 250 separated by the scum chamber 240 and the diaphragm 251 and discharged to the supernatant water outlet 202 by introducing supernatant water into a supernatant water inlet formed at the lower portion; A recirculation suction pipe 260 to which a circulation pump 261 is connected and installed for recirculating by sucking the treated water that has not been moved to the supernatant water inlet 250 from the lower portion of the supernatant water inlet 250 and transferring it to the electrical coagulation section 220 for recirculation. includes

In the present invention, the electrical aggregation in the circulation tank 200 is made through a powder electrode, and the powder electrode fixing device 210 for fixing the powder electrode is formed in a rectangular parallelepiped shape by pressing porous null iron. a powder electrode 211 that agglomerates and dissolves contaminants contained in the supplied influent; Supplying electricity to a plurality of powder electrodes 211 a pair of electrode terminal connecting rods 212 including electrode rods 212a and protruding higher than the powder electrodes 211 disposed with a plurality of powder electrodes 211 interposed therebetween; The front and rear surfaces and the upper surface are opened, the powder electrode 211 and the electrode terminal connecting rod 212 are inserted inside, and the inflow groove 213a through which the inflow water passes between the powder electrodes 211 on the lower surface is spaced apart by a predetermined interval. The holder 213 is formed, on both sides of which an insertion groove is formed into which the electrode rod 212a of the electrode terminal connecting rod 212 is inserted in the longitudinal direction, and a treated water discharge groove is formed in the upper side of the side surface for discharging the treated water from which the contaminants are removed. including; The central width of the holder 213 is narrower than the width of both sides, and the front and rear surfaces of the holder 213 are half of the inlet groove 213a on the lower surface. It is provided to be spaced apart from the powder electrode 211 of the holder 213 at the same distance.

In the raw water supply pipe 110 of the present invention, hydrochloric acid and brine are supplied from the hydrochloric acid tank 120 and the brine tank 130 by the hydrochloric acid supply pump 121 and the brine supply tank 131, and the PH adjustment tank 300 In the sodium hydroxide tank 320 and the auxiliary coagulant tank 330, sodium hydroxide and the auxiliary coagulant are supplied by the sodium hydroxide supply pump 321 and the auxiliary coagulant supply pump 331, and are transferred from the supernatant water discharge pipe 310. Stir the water.

The circulation pump 261 of the present invention adjusts the flow rate of the treated water discharged from the recirculation suction pipe 260 to the branch pipe 262 connected to the electrical coagulation section 220 according to the quality of the raw water, and the electrical coagulation section A sludge outlet 206 through which the coagulated sludge is discharged is formed in the lower portion (220).

The powder electrode 211 of the present invention is made by pressing porous zero-ferrous powder, and the powder electrode 211 is stacked and inserted into the holder 213 in which the electrode terminal connecting rod 212 is inserted, and the powder electrode 211 ) is inserted into the insertion groove 213b so that the spacer 214 is in contact with the electrode rod 212a of the electrode terminal connecting rod 212, and the holder 213 is arranged and coupled to the other holder 213 in front and rear abutment, and , a plurality of electrode terminal connecting rods 212 are connected to the bus bar 222 on the top of the plurality of holders 213 to receive electricity.

In the present invention, the sludge pump 711 connected to the sludge supply pipe 710 connecting the settling tank 400 and the sludge tank 700 increases the amount of sludge accumulated in the settling tank 400 to the outflow tank 500. It is pumped to the sludge tank 700 before being carried over, and the sludge deposited in the circulation tank 200 is removed.

In the present invention, the discharge pump 511 installed in the discharge water discharge pipe 510 connected to the discharge tank 500 is controlled by a water level sensor installed in the discharge tank 500, and operates when the water level reaches a first set value. , stops when it is below the second set value, and when it is above the third set value, the raw water supply pump 111, hydrochloric acid supply pump 121, brine supply pump 131, sodium hydroxide supply pump 321, and auxiliary coagulant supply pump 331 are operated. Stop and the power supply is cut off.

In the filtration tank 600 of the present invention, coal-based or palm-based powdered activated carbon and ultra-high molecular weight polyethylene (UHMW PE) are stirred, the mixture is put in a mold, compressed, fired, and cut to a desired size. is installed

In the present invention, the lower ends of the scum chamber 130 and the supernatant water inlet 250 have the same height, so that only the treated water passing through the lower part of the scum chamber 130 flows into the supernatant water inlet 250 .

Therefore, the wastewater treatment reuse system of the present invention electrically coagulates the raw water flowing into the circulation tank from the inflow water tank and recirculates the treated water when it is difficult to decompose the microbial method, has a narrow installation area, or requires rapid wastewater treatment. , through the sedimentation tank, the outflow tank, and the filtration tank to form a powder electrode that induces oxidation and reduction reactions without applying electrical energy to increase the efficiency of pollutant removal, and to maximize the specific surface area to volume, so low energy consumption It also secures rapid cohesive reactivity, removes contaminants from organic matter to heavy metals in one process, and has the effect of treating wastewater in an environmentally friendly manner without adding additional chemicals for pH correction.

In addition, the present invention widely removes organic and inorganic pollutants, separates them in the form of non-toxic metal oxides, reduces installation and operating costs, as well as high pollutant removal rate in specific wastewater, produces OH radicals, , has a sterilizing effect.

In addition, the present invention does not require addition of chemicals other than pH correction, which is rarely selected to remove trace amounts of residual iron ions that may exist in treated water, reduces production through sludge optimization, and can simultaneously treat various contaminants. It works.

And, in the present invention, raw water flowing from the influent tank to the circulation tank moves from the bottom to the top, passes through the electrocoagulation section where the electrocoagulation occurs between the powder electrodes, and moves to the circulation section, but the scum floating on the top is transferred to the scum chamber, , the sediment sinking to the bottom is discharged to the sediment outlet, and the treated water that has not been transferred to the supernatant inlet is sucked in by the circulation pump and transferred back to the electric coagulation section. Not only can the treated water be mixed evenly, but it also has the effect of increasing energy efficiency and electrode lifespan.

In addition, the present invention provides a powder electrode that is formed in a rectangular parallelepiped shape by pressing porous powdered null iron and is dissolved by aggregating contaminants contained in influent water supplied from the outside using the principle of electrical coagulation, and electricity is supplied to the powder electrode The electrode terminal connecting rod is inserted and fixed for this purpose, and an inflow groove is formed so that the inflow water passes between the powder electrodes from the lower surface, and the electrode terminal connecting rod is installed to be positioned higher than the powder electrode, and contaminants are removed from the powder electrode on the upper side There is an advantage in that the inflow water is uniformly treated and the water treatment efficiency is increased by inserting a powder electrode fixing device comprising a holder having a treated water discharge groove through which the treated water is discharged into the electrocoagulation section of the circulation tank.

On the other hand, the present invention secures the stability of the reaction by supplying the diluted treated water through the electrocoagulation section in the circulation tank first to the electrocoagulation section where the raw water is introduced, so as to have sufficient contact time with the powder electrode, According to the quality of the raw water, the flow rate of the treated water discharged from the recirculation suction pipe to the electric coagulation section is adjusted, so that the raw water and the treated water can be mixed more efficiently.

In addition, the present invention has the advantage of continuously treating the sewage and wastewater by controlling the number of powder electrodes, the applied current, and the flow rate per minute according to the daily treatment capacity.

In addition, the present invention inserts the powder electrode fixing device into the electrical coagulation section of the circulation tank, arranges and combines it with other powder electrode fixing devices in front and rear to abut against each other, and places a plurality of powder electrode fixing devices on top There is also an advantage in that a large amount of sewage and wastewater can be treated by adjusting the size of the circulation tank where the electrode terminal connector is connected and electricity is supplied from the bus bar for electrical coagulation.

The present invention also has an advantage in that even when a plurality of powder electrode fixing devices are arranged side by side in the electrocoagulation section of the circulation tank, the distance between the powder electrodes can be maintained the same, so that the electrocoagulation reaction can be uniformly performed.

In the present invention, the inflow water flowing through the inflow grooves formed at regular intervals on the lower surface of the powder electrode fixing device rises along the stacked-accommodated powder electrode, the powder electrode is uniformly dissolved, and the voltage increases as the distance between the powder electrodes increases. There is also the advantage of being able to easily know when to replace the powder electrode so that the powder electrode can be replaced.

In the present invention, a powder electrode is stacked and inserted into the holder into which the electrode terminal connection rod is inserted, and a spacer is inserted so that the powder electrode contacts the electrode rod of the electrode terminal connection rod, so that electricity is stably supplied from the electrode terminal connection rod to the powder electrode, The lower surface of the holder is slidably and detachably installed from both sides, so that it is easy to replace the powder electrode.

And, in the present invention, it is possible to reuse the treated water to industrial water, agricultural water, or raw water without using chemicals, and the use of the powder electrode reduces electricity consumption and lengthens the life of the electrode, and does not require electrode cleaning as well as agglomeration. The effect is excellent.

In addition, the present invention can easily and cleanly manage the electrode terminal connecting rod by periodically switching the negative electrode and the positive electrode so that hydrogen gas is generated on the surface of the powder electrode and sticking is removed.

1 is a schematic perspective view of a wastewater treatment reuse system according to an embodiment of the present invention;
2 is a plan view of a wastewater treatment reuse system according to an embodiment of the present invention;
3 is a side view of a wastewater treatment reuse system according to an embodiment of the present invention;
4 is a rear view of a wastewater treatment reuse system according to an embodiment of the present invention;
5 is an overall configuration diagram of a wastewater treatment reuse system according to an embodiment of the present invention;
6 is a perspective view of a circulation tank in a wastewater treatment reuse system according to an embodiment of the present invention;
7 is a cross-sectional view of a circulation tank in a wastewater treatment reuse system according to an embodiment of the present invention;
8 is an enlarged view of an electric coagulation section in a circulation tank according to an embodiment of the present invention;
9 is a perspective view of a powder electrode fixing device inserted into an electric coagulation section of a circulation tank according to an embodiment of the present invention;
10 is a plan view and a cross-sectional view of a powder electrode fixing device inserted into an electric coagulation section of a circulation tank according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them.

The present invention is a wastewater treatment reuse system for wastewater treatment when it is difficult to apply a microbial method, is difficult to decompose, has a small installation area, or when rapid wastewater treatment is required. As shown in FIGS. 1 to 5,

An inflow water tank 100 in which raw water is stored, the raw water supply pipe 110 is coupled, and the raw water supply pump 111 is connected to the raw water supply pipe 110 to supply raw water to the next treatment process;

a circulation tank 200 provided as a reaction tank in which electrical coagulation of raw water supplied through the raw water supply pipe 110 and circulation of treated water are made;

The circulation tank 200 and the supernatant water discharge pipe 310 are connected, and the sodium hydroxide tank 320 and the auxiliary coagulant tank 330 are connected to the treated water transferred from the supernatant water discharge pipe 310. Sodium hydroxide and auxiliary coagulant A PH adjusting tank 300 that is injected and stirred to adjust the PH, and

A sedimentation tank 400 in which sludge is precipitated from the treated water transferred from the PH adjustment tank 300;

an outlet tank 500 comprising a discharge tank into which the supernatant water transferred from the settling tank 400 flows;

A hollow cylinder-shaped compressed carbon obtained by stirring the effluent discharged from the effluent tank 500 with coal-based or palm-based powdered activated carbon and ultra-high molecular weight polyethylene (UHMW PE), putting the mixture into a mold, compressing and calcining, and cutting to a desired size A filtration tank 600 for filtering with a block filter, and

and a sludge tank 700 into which the sludge transferred from the circulation tank 200 and the settling tank 400 is introduced and concentrated.

The wastewater treatment reuse system supplies raw water to the influent tank 100, and then transfers the raw water to the circulation tank 200 by the raw water supply pump 111 installed in the raw water supply pipe 110 connected to the circulation tank 200. .

The raw water supply pump 111 is controlled by the first flow meter 114 . For automatic control, 4-20 mA output of the first flow meter 114 is required, and this is to control the shift frequency for operating the raw water supply pump 111 . The flow range must be adjustable according to the site conditions, and when the water level in the influent tank 100 drops below 10% or the water level in the outflow tank 500 rises to 95% or higher, the power of the raw water supply pump 111 is cut off. .

On the other hand, in the raw water supply pipe 110, hydrochloric acid or brine is supplied to the supply pipe to adjust pH or electrical conductivity according to the raw water quality, or to remove chromaticity or hard-to-decompose contaminants. A tank 120 and a brine tank 130, a hydrochloric acid supply pump 121 and a brine supply pump 131 are provided, and hydrochloric acid and brine are supplied with a hydrochloric acid supply pump 121 in the hydrochloric acid tank 120 and the brine tank 130. ) and the brine supply tank 131 to be supplied to the raw water supply pipe 110 .

The hydrochloric acid supply pump 121 is controlled by the pH sensor 113 installed on the influent tank 100 or the raw water supply pipe 110. For automatic control, when the signal of the pH sensor 113 is sent to the pH control device, The control device controls the hydrochloric acid supply pump (121).

At this time, the preferred raw water pH should be 8 or less, and if the raw water has a pH of 8 or less, the hydrochloric acid supply pump 121 is not required. If the pH is 8 or higher, the hydrochloric acid supply pump 121 operates to adjust the pH. However, the use may be changed to a pump and tank for supplying chlorine dioxide or hydrogen peroxide for color removal of wastewater and oxidation of difficult-to-decomposable substances. It works as a metering method with a range. When the water level in the influent tank 100 goes down to 10% or the water level in the outflow tank 500 is 95% or more, the power of the hydrochloric acid supply pump 121 is cut off.

The brine supply pump 131 is controlled by an electrical conductivity sensor 112 installed on the influent tank 100 or the raw water supply pipe 110 . Preferably, the set value of the conductivity is about 2,000 μs/cm2, and the normal set value can be reduced to about 1,500 μs/cm2. When the water level in the inflow water tank 100 drops below 10% or the water level in the outflow tank 500 becomes 95% or more, the power of the brine supply pump 131 is cut off like the hydrochloric acid supply pump 121 .

On the other hand, in the present invention, raw water whose pH and electrical conductivity are adjusted moves from the influent tank 100 to the circulation tank 200 and passes through an electrocoagulation reactor, and in the anode (anode, anode), iron ions (Fe ²⁺ , Fe ³⁺ ) is dissolved to neutralize the colloidal or particulate organic compound and SS (suspended solid) whose surface is charged with anions in raw water for coagulation, and H ₂ O (water) at the electrode interface ) is electrolyzed, O ₂ is released, and H ⁺ (hydrogen ions) and OH ^- (OH radicals) are generated to oxidize organic materials, and at the cathode (cathode, reduction electrode), H ₂ O (water) is electricity ^{It decomposes and combines with H +} (hydrogen ion) generated at the anode to _{release two H 2} (hydrogen), and at the same time OH ^- (OH radical) is generated to form iron ions (Fe ²⁺ , Fe ³⁺ ) combined with organic compounds. is reduced to harmless iron hydroxide form.

The present invention destroys the molecular bonding force of organic compounds in raw water and nitrate nitrogen or nitrite nitrogen with the strong oxidizing power of ^{OH -} (OH radical) generated at the electrode interface of the anode and the cathode. It releases gas (N2) to decompose total nitrogen.

In the present invention, iron ions (Fe ²⁺ , Fe ³⁺ ) dissolved in the anode are easily precipitated in the form of iron phosphate (FePO4) by combining with phosphorus compounds in raw water to remove total phosphorus.

The present invention combines heavy metals such as lead, mercury, cadmium, aluminum, and copper, which behave in a cationic form, with OH ^- (OH radicals) generated at the electrode interface of the anode (anode) and cathode (cathode, cathode) to harmless hydroxide ^{H +} (hydrogen ion) generated at the interface of iron ions (Fe ²⁺ , Fe ³⁺ ) and anode (anode, anode) and OH ^- (OH radical) to remove precipitation in the form of iron hydroxide compounds or metal hydroxides.

In the present invention, hydrochloric acid (HCl) and brine (NaCl) added to correct pH or increase electrical conductivity are decomposed at the electrode interface, _{emit chlorine gas (Cl 2} ), and generate hypochlorous acid (HOCl) to indirectly oxidize organic compounds to decompose and break through the molecular bonds of ammonia nitrogen _{to release nitrogen gas (N 2} ) and reduce total nitrogen.

As shown in FIGS. 6 to 8 , the circulation tank 200 receiving raw water by the raw water supply pipe 110 is formed to have an open upper part, and the raw water supply pipe 110 is connected to the upper part of one side. The raw water inlet 201 through which raw water is introduced is formed, and it consists of a reaction tank in which the supernatant water outlet 202 connected to the supernatant water outlet pipe 310 is formed on the opposite side, and is spaced apart from the raw water inlet 201. The first An electric coagulation section 220 in which raw water is introduced from the bottom by a partition wall 203, a plurality of powder electrode fixing devices 210 are inserted and mounted, and electric coagulation occurs when electricity is supplied, and the electric coagulation section 220 Circulation section ( 230) and a scum chamber 130 having a plate provided at the front in the upper part of the circulation section 120, having a higher height than the plate at the rear, and preventing supernatant water from being discharged by the clogged diaphragm 141; The supernatant water inlet 250 is separated by the scum chamber 240 and the diaphragm 251 and supernatant water is introduced into the supernatant water inlet hole formed in the lower part and discharged to the supernatant water outlet 202, and the supernatant water inlet 250 from the lower part It includes a recirculation suction pipe 260 to which a circulation pump 261 for sucking the treated water that has not moved to the supernatant inlet 250 and transferring it to the electric coagulation section 220 for recirculation is connected and installed.

In this way, the circulation tank 200 is configured with an electric coagulation section 220 in which the electrical coagulation of raw water is made and a circulation section 230 comprising a recirculation tank that recirculates the treated water.

In the circulation tank 200 , raw water introduced through the raw water inlet 201 coupled to the raw water supply pipe 110 is transferred to the lower part by the first bulkhead 103 with an open lower part and moves to the electric coagulation section 220 . do. A plurality of powder electrode fixing devices 210 are mounted in the electric coagulation section 220, and the raw water moved to the electrical coagulation section 220 moves from the lower part to the upper part of the powder electrode fixing device 210 so that electrical coagulation is performed. do.

At this time, the raw water is electrocoagulated to generate sludge, and the coagulated sludge is discharged through the sludge outlet 206 formed in the lower part of the electrocoagulation section 220 .

The sludge discharged from the sludge outlet 206 is sediment generated during the raw water treatment process in the electric coagulation section 220, and the treated water is transferred from the circulation section 230 and the sediment discharged from the sediment outlet 205 through which the precipitated sediment is discharged. It is provided to move to the sludge tank 700 along with the sludge supply pipe 710 and to be reprocessed.

In the present invention, the water flowing in from the raw water inlet 201 is raw water, and the water that moves to the next stage through the supernatant water outlet 202 from the water firstly treated in the electric coagulation section 220 is supernatant water, and the recirculation suction pipe ( 260) and recirculated to the electrical coagulation section 220 is treated water.

In the present invention, the circulation pump 261 adjusts the flow rate of the treated water discharged from the recirculation suction pipe 260 to the electric coagulation section 220 according to the quality of the raw water, so that the raw water and the treated water can be effectively mixed.

At this time, the flow rate varies depending on whether there are many or few hardness substances in the raw water, and in general, it should be discharged 2 to 4 times higher than the inflow of the raw water.

In the electrocoagulation section 220, zero iron is used to decompose (oxidize), coagulate (reduce), and remove phosphorus.

A powder electrode 211 made of zero ferrous iron is inserted into the powder electrode fixing device 210 inserted into the electric aggregation section 220, and the null ferrous iron reacts with a nitrogen compound and water to be oxidized to divalent iron to generate a hydroxyl group, Nitrogen compounds are reduced and removed with nitrogen gas through selective catalytic oxidation/reduction. Divalent iron generated from zero-valent iron generates hydroxyl radicals from the electrode interface and is oxidized to trivalent iron, promoting sludge co-precipitation (precipitation). At this time, the generated hydroxyl radical decomposes organic matter to make organic radical, and trivalent iron is reduced back to divalent iron by this organic radical, and the organic radical is eventually oxidatively decomposed.

As shown in FIGS. 9 and 10, the powder electrode fixing device 210 is formed in a rectangular parallelepiped shape by pressing porous zero-valent iron having a valence of 0, and contaminants contained in the influent supplied from the outside are aggregated. It includes a powder electrode 211 that is melted and an electrode electrode 212a formed to be spaced apart from each other by a predetermined interval at the bottom, and the powder electrode 211 is interposed therebetween. A pair of electrode terminal connecting rods 212 that protrude higher than the powder electrode 211, the front and rear surfaces and the upper surface are opened, and the powder electrode 211 and the electrode terminal connecting rod 212 are inserted inside, and a plurality of The inflow grooves 213a through which the inflow water passes between the powder electrodes 211 of and a holder 213 having a treated water discharge groove 213c through which the treated water from which the contaminants are removed is formed on both sides of the upper portion.

And, as shown in FIG. 8, the electrode terminal connecting rod 212 includes a bus bar 222 and an electric wire ( 223) to supply the electrode to the powder electrode 211 so that the powder electrode 211 is electrically agglomerated.

On the other hand, the central width of the holder 213 is narrower than the width of both sides of the lower surface, and the front and rear surfaces of the holder 213 are half of the inlet groove 213a on the lower surface. It is provided to be spaced apart at the same distance from the powder electrodes 211 of the other holder 213 so that the raw water flowing in from the bottom is treated uniformly.

The raw water flowing in from the inflow groove 213a formed in the lower surface (bottom surface) of the holder 213 flows into the powder electrode fixing device 210 in a state in which heavy sediment is excluded from the waste water, and the powder electrode 211 ), the contaminants are removed, and the treated water is discharged from the holder 213 through the treated water discharge groove 213c formed on the side.

The powder electrode 211 is made of zero-valent iron, which is first put iron ore together with limestone and coal and melted to obtain porous iron, and hydrogen is injected into the obtained porous iron through heat treatment and hydrogen reduction reaction.

The zero value iron is a porous powder, and when iron ore, limestone, and coal are filled in a mold, sealed, and heated to 1,200 degrees or more, carbon dioxide and carbon dioxide gas microbubbles generated from coal and limestone are mixed in the molten iron, and it is cooled After forming a porous iron ingot, hydrogen is injected into the mold again, sealed, and heat treated at 800 degrees for 40 minutes. After filling the mold with 150um porous zero-ferrous iron powder, it is compressed with a press to form a powder electrode. Porous null iron powder is also called sponge iron, and since it has inter-locking properties without adhesive when pressed, lubricant is applied to the mold and the null iron powder is compressed. When it is blown away, the powder electrode 211 in which the powder particles are tightly adhered and solidified to each other can be obtained.

As such, the powder electrode 211 in which the powder iron is sintered is formed to a thickness of 8.3 mm, and is spaced apart from the holder 213 at an interval of 6 mm from the other powder electrodes 211. dissolves

The powder electrode 211 is uniformly melted and dissolved in the influent supplied between the plurality of powder electrodes 211, and sinks as it aggregates with the contaminants in the influent.

On the other hand, the distance between the powder electrode 211 and the other powder electrodes 211 disposed on the front and rear surfaces of the powder electrode 211 is best performed at 5 mm, but in the present invention, the distance between the powder electrodes 211 is 6 mm, It is preferable that the thickness of the powder electrode 211 is 8.3 mm when the electrode replacement cycle is accelerated by increasing the flow rate. When the thickness of the powder electrode 211 is 8.3 mm, the removal of contaminants is most effective.

The powder electrode 211 is uniformly dissolved and thinned, and when the distance between the powder electrode 211 and the other powder electrode 211 is about 10 mm, the voltage increases. is approximately 3 to 6 months.

In this case, the number of the powder electrodes 211 installed in the holder 213 can be increased in order to increase the replacement cycle of the powder electrodes 211 .

In addition, the powder electrode 211 can manage the replacement cycle by periodically performing switching to replace the electrode of the electrode terminal connecting rod 212 so that hydrogen gas is generated on the surface and sticking is removed. And, the powder electrode 211 is naturally decomposed and consumed without any contaminants attached to it if the electrode is switched.

Such a powder electrode 211 consumes less electricity than other electrodes, has a long lifespan of the electrode, and dissolves itself, so it does not require electrode cleaning and has an excellent agglomeration effect.

As described above, the present invention increases the efficiency of removing contaminants by using as an electrode zero-valent iron that induces oxidation and reduction reactions without applying separate electrical energy, which does not exist in nature.

On the other hand, the electrode terminal connecting rod 212 is made of a metal structure provided with a bus bar 222 for providing electricity on the upper portion to supply electricity to the powder electrode 211. An electrode 212a is formed, and the electrode 212a is connected at an upper end.

The electrode rod 212a is formed to have a length longer than the length of the insertion groove 213b of the holder 213, and when the electrode terminal connecting rod 212 is installed in the holder 213, the upper end of the electrode rod 212a is 9, the same or higher than the treated water discharge groove 213c formed in the upper portion of the insertion groove 213b. Accordingly, the treated water is discharged through the gap between the electrode rods 212a and the treated water is moved through the treated water discharge groove 213c of the holder 213 . This is also related to the height with the treated water when electricity is provided, which will be described later.

In the drawings of the present invention, the electrode rods 212a are formed of three legs, but the number may be changed according to the size of the holder 213 . The upper end of the electrode terminal connecting rod 212 is bent at the electrode rod 212a and spaced apart from the holder 213 so that it can be easily inserted and removed from the holder 213 .

In addition, the electrode terminal connecting rod 212 is provided so that one side of the powder electrode 211 can be touched, and the electrode terminal connecting rod 212 is provided in a holder 213 in which a plurality of powder electrodes 211 are spaced apart from each other by a predetermined interval. ) is provided as a pair having an anode and a cathode electrode, that is, an anode electrode and a cathode electrode with the powder electrode 211 interposed therebetween.

Accordingly, when the powder electrode 211 having an anode and a cathode is alternately arranged and energized by the anode of the anode electrode and the cathode of the cathode electrode in the holder 213, where the influent, which is a conductive liquid, is introduced through the inlet groove 213a. The electrocoagulation reaction takes place to treat the water. In addition, the positive electrode and the negative electrode are alternately arranged in the insertion groove, so that the positive and negative electrodes do not contact each other in one powder electrode 211 .

At this time, the electrode terminal connecting rod 212 is provided to be positioned above the powder electrode 211 so that the upper end connected to the bus bar 222 providing electricity to the electrode terminal connecting rod 212 does not come into contact with the influent water.

On the other hand, the powder electrode 211 and the electrode terminal connecting rod 212 are inserted into the holder 213, the electrode terminal connecting rod 212 is first inserted and fixed in the holder 213, then the powder electrode 211 is Doedoe stacked insertion in multiple stages, the electrode terminal connecting rod 212 and the powder electrode 211 arranged to be spaced apart from the electrode terminal connecting rod 212 by a predetermined space for smooth insertion are in close contact with the electrode rod 212a of the electrode terminal connecting rod 212, the electrode terminal connecting rod 212 ) to the powder electrode 211, a spacer 214 is inserted and mounted from the powder electrode 211 to the opposite side not in contact with the electrode terminal connecting rod 212, and is provided to push the powder electrode 211 .

The spacer 214 is formed in a rod shape and is inserted into the insertion groove 213b of the holder 213 in which the electrode rod 212a of the electrode terminal connecting rod 212 is not inserted, and the upper side is bent so that it is easily inserted into the insertion groove 213b. ) and may be provided so that it can be inserted and removed.

As described above, the holder 213 is composed of a housing having an open front, rear, and upper surface, and the powder electrode 211 and the electrode terminal connecting rod 212 are inserted and fixed inside, and a plurality of powder electrodes 211 disposed on the lower surface. ), the inlet grooves 213a are formed to be spaced apart from each other by a predetermined interval so that the inflow water passes between them, and the electrode terminal connecting rod 212 or spacer composed of an electrode rod 212a that supplies electricity by contacting the powder electrode 211 on both sides in the longitudinal direction. An insertion groove 213b into which the 214 is inserted is formed, and a treated water discharge groove 213c through which the treated water from which the contaminants are removed is formed on both sides of the upper portion. An electrode 212a is disposed inside the treated water discharge groove 213c, and the treated water passes through a gap between the electrode rods 212a to move to the treated water discharge groove 213c.

A space is formed on the lower surface of the holder 213 so that 6 pieces of powder electrodes 211 can be arranged, and 6 sheets are stacked on top of the 6 sheets of powder electrodes 211 so that there is a total of 36 sheets in one holder 213 . The intestinal powder electrode 211 can be inserted and fixed.

The inflow grooves 213a have the same width as the interval between the powder electrodes 211, and the width of the portion where the powder electrodes 211 is disposed between the inflow grooves 213a is the thickness of the powder electrode 211. It is made of 8.3mm.

As shown in FIG. 10, five inlet grooves 213a are provided on the lower surface where six powder electrodes 211 are disposed, and the lower surface of the holder 213 has powder electrodes 211 on the front and rear surfaces. The outer surface of the portion to be disposed is formed in a concave shape.

As such, the central width of the lower surface of the holder 213 is narrower than the width of both sides, and the front and rear surfaces of the holder 213 are half of the inlet groove 213a on the lower surface, and the width is 6 mm between the powder electrodes 211. When a plurality of holders 213 are combined, the gap between the powder electrodes 211 disposed at both ends on the lower surface and the powder electrodes 211 of the other holder 213, the entire lower surface of the holder 213 is It is spaced apart from the rear surface of the lower surface of the other holder 213 so that a place where the inflow water flows between the holder 213 and the holder 213 is formed to be the same 6mm as the inflow groove 213a.

The treated water discharge groove 213c is formed of a portion from which the treated water is discharged through the powder electrode 211 at the upper portion of the holder 213 , and at the same time, a holder 213 for replacement of the powder electrode 211 . It becomes possible to act as a handle to pull the .

In addition, the lower surface of the holder 213 is slidably and detachably installed from both sides, so that the powder electrode 211 can be easily replaced. In addition, since the lower surface is continuously contaminated by the influent into the space into which the contaminated influent flows, it may be damaged in a short period of time, and thus the lower surface itself may be replaced.

At this time, coupling grooves are formed on the inner lower portions of both sides of the holder 213, and coupling protrusions inserted into the coupling grooves are formed on both sides of the lower surface. In addition, on the upper portions of both sides of the holder 213, supports for coupling and supporting both sides of the holder 213 are installed in parallel with each other.

As described above, the powder electrode fixing device 210 including the powder electrode 211, the electrode terminal connecting rod 212, and the holder 213 into which the spacer 214 is inserted is inserted into the electrical aggregation section 220 in order to perform the electrical aggregation. In the electrical cohesion section 220, the holder 213 is arranged and coupled to the other holder 213 in front and rear abutment, and a plurality of electrode terminal connecting rods 212 are connected to the electric wire 223 on the plurality of holders 213. It is provided to be connected to the bus bar 222 to receive electricity.

The bus bar 222 is installed to keep the distance between the bus bar 222 and the powder electrode 211 about 15 cm so that the scum does not come into contact with it. And when the voltage rises, it is possible to determine the replacement time.

The powder electrode 211 is uniformly consumed by the electrocoagulation reaction, and is agglomerated by adhering to the contaminants of the influent and falling to the bottom.

As described above, in the powder electrode fixing device 210 of the present invention, the inflow water is introduced from the bottom through the inflow groove 213a of the lower surface of the holder 213, passes between the stacked-coupled powder electrodes 211, and electrical aggregation occurs. The treated water from which the contaminants have been removed through the powder electrode 211 is discharged from the upper portion along the treated water discharge groove 213c at the upper portion and moves to the next treatment process.

In this way, raw water passes between the powder electrodes 211 and the electrocoagulation is made, and the treated water is discharged from the upper part of the holder 213, and in the electrocoagulation section 220, the lower part is opened into a plurality of spaces with the partition plate 221. The raw water separated and introduced from the lower part and the treated water discharged from the branch pipe 262 connected to the recirculation suction pipe 260 are evenly mixed and reacted to cause the sludge to be separated in the electric coagulation section at the upper part of the second bulkhead 204 It passes through 220 and is transferred to the circulation section 230 .

The scum floating on the upper part of the treated water introduced into the circulation section 230 is collected in the scum chamber 240 installed at the end of the treated water flowing direction, and the sediment sinking to the lower part is the sediment formed in the lower part of the circulation section 230 . The sludge tank 700 is discharged along the sludge supply pipe 710 through the outlet 205 .

The scum chamber 240 is provided with a plate having a plurality of projections 241 in the front to hold the scum, a bubble that collects dirty components on the surface of the treated water, and removes the scum by sucking the scum therein A tube 242 is provided.

The scum chamber 240 is formed to be separated into a supernatant water inlet 250 and a diaphragm 251, and the supernatant water inlet 250 has a supernatant water inlet hole formed in the lower portion. ) consists of a space in which the supernatant water discharged to the supernatant water outlet 202 formed on the opposite side is collected. The diaphragm 251 is formed higher than the protrusions 241 , so that the scum passing between the protrusions 241 does not pass through the diaphragm 251 . The supernatant water inlet 250 is formed with a supernatant water inlet hole in the lower part, flows into the lower part rather than the protrusion 241 side, and becomes the same height as the lower end of the scum chamber 240 in the drawing, and the lower end (or lower part) of the scum chamber 240 . ), only the treated water flows in.

The supernatant water outlet 202 is connected to the supernatant water outlet pipe 310 so that supernatant water is transferred to the PH control tank 300 which is the next step.

The recirculation suction pipe 260 provided in the lower portion of the supernatant water inlet 250 sucks the treated water that has not moved to the supernatant water inlet 250 because a plurality of through holes are formed on the outer circumferential surface to transfer it to the electrical coagulation section 220. .

The recirculation suction pipe 260 is connected to the circulation pump 261 outside the circulation tank 200 , and the circulation pump 261 is connected to the branch pipe 262 so that the branch pipe 262 is electrically coagulated section 220 . ) is branched into a plurality at the lower part to discharge the treated water from the lower part of the powder electrode fixing device 210 .

In the recirculation suction pipe 260, a plurality of through holes are formed on a partial outer circumferential surface located in the circulation section 230, and a plurality of through holes are also formed in the partial outer circumferential surface located in the electric coagulation section 220 in the branch pipe 262, so that the treated water It is provided so that suction and discharge of the

Such a circulation tank 200 has a raw water inlet 201 through which raw water is introduced on one side of the upper part, and raw water is introduced from the lower part by a first bulkhead 203 spaced apart from the raw water inlet 201. An electric coagulation section 220 is formed, and a plurality of powder electrode fixing devices 210 are inserted and mounted in the electrical aggregation section 220, and the powder electrode fixing device 210 is passed through the electric coagulation section 220 in the electric coagulation section 220. The second bulkhead 204 for transferring the treated water to the upper part is formed, the scum from the treated water passing through the electric coagulation section 220 is transferred to the upper part, and the sediment is transferred to the sediment outlet 205 at the lower part. A section 230 is formed, and a scum chamber 240 for filtering scum is installed on one side of the upper portion of the circulation section 230, and the scum chamber 240 and the diaphragm 251 are separated into the upper water inlet hole at the bottom. A supernatant water inlet 250 is provided through which supernatant water is introduced and discharged to the next treatment process, and a recirculation suction pipe ( 260) is installed, and the recirculation suction pipe 260 is connected to the circulation pump 261 to control the inflow of the treated water sucked in the circulation section 230 so that it is quickly discharged to the electrical coagulation section 220. It is formed so that the agglutination reaction is carried out efficiently.

In the circulation tank 200 , the recirculation suction pipe 260 is coupled to the recirculation suction pipe coupling part 207 , and the branch pipe 262 is coupled to the branch pipe coupling part 208 .

On the other hand, the electrical coagulation section 220 is designed so that the volume between the powder electrode 211 and the powder electrode 211 is 1:1 with the amount of treated water inflow, and the rectifier installed in the electrical coagulation section 220 is pilot tested. Determine the rated capacity of the supply current by referring to the current density obtained from , and include an auto polarity reversing function.

On the other hand, the circulation section 230 is installed for stability of the aggregation reaction and electrode scale removal, and is designed to be 10 to 30 times the volume of the influent, and the correct volume is calculated and formed through a test.

The power sent to the electrical coagulation section 220 is supplied by a DC power supply, and the amount of current supplied to the EC electrode depends on the concentration of contaminants, the current density for reducing agglomeration, and the hydraulic residence time. To make a decision, the optimum current density and quality of treated water must be confirmed through teaser and pilot tests.

The wastewater treatment reuse system of the present invention is operated in a constant current method, and the voltage is determined according to the strength of the current and the size of the resistance and is not a fixed value.

The area of the electrode used for the teaser is 0.005 m2, and the area of the electrode used for the pilot and full scale is 0.023 m2. The number of powder electrodes 211 used in the teaser is 2, and the number of pilots is 12. In the case of full scale, 576 sheets are used for 100 tons of processing capacity per day. The standard of the DC power supply to be installed in the daily processing capacity of 15 tons should be 200A, most preferably, 300A in consideration of the safety factor, and in the case of 300 tons, a 5,000A standard rectifier should be installed.

In addition, the circulation tank 200 should be provided with a cover 270 that can cover the open upper surface, which is to block this because the bus bar 222 and the like may be exposed and an electric shock accident may occur. In addition, a safety switch that can cut off electricity in the power supply should be installed. In addition, the circulation tank 200 is further formed with an external support 280 to be supported from the bottom, and an internal support 290 for supporting the internal space.

And when the water level in the influent tank 100 goes down to 10% or the water level in the outflow tank 500 is 95% or more, the DC power supply is cut off.

In addition, the circulation pump 261 mounted on the circulation tank 200 is controlled by visual inspection of the second flow meter 263 installed in the recirculation suction pipe 260, and the flow rate is manually adjusted using a valve.

The appropriate range of the flow rate of the circulation pump 261 is set to 0.75 to 4 times the inflow flow rate according to the quality of the raw water, and the purpose of the circulation tank 200 is to secure the stability of the reaction and remove the electrode scale, so that it can be operated flexibly. In addition, the circulation pump 261 is also cut off when the water level in the inlet tank 100 drops below 10% or when the water level in the outlet tank 500 is 95% or more.

The supernatant water that is treated in the circulation tank 200 and moves through the supernatant discharge pipe 310 adjusts the pH of the effluent in the PH adjusting tank 300 before moving to the settling tank 400 through the settling tank discharge pipe 340, or the reaction residual iron For the removal of ions, sodium hydroxide (caustic soda) is added from the sodium hydroxide tank 320 to the sodium hydroxide supply pump 321 to adjust the pH, and the auxiliary coagulant (polymer) is supplied from the auxiliary coagulant tank 330. It is possible to greatly improve the speed of sedimentation by transferring it to the pump 331 and inputting it.

The sodium hydroxide supply pump 321 is controlled through a pH sensor installed in the pH adjustment tank (300). The pH electrode sends a signal to the pH controller to control the sodium hydroxide supply pump 321 . A preferable value of the pH in the pH adjustment tank 300 is 7.5 to 8.5, and the most preferable value is 8.5. The sodium hydroxide (NaOH) injection position is the PH control tank 300, and the supernatant water and the stirrer 350 are used to rapidly stir. If the pH of the supernatant needs to be lowered depending on the quality of the supernatant, hydrogen chloride (HCl) may be injected. When the water level in the influent tank 100 goes down to 10% or the water level in the outflow tank 500 becomes 95% or more, the power of the sodium hydroxide supply pump 321 is cut off.

In addition, the auxiliary coagulant supply pump 331 is quantitatively adjusted according to the required amount of auxiliary coagulant (polymer) injected without being controlled by other devices, and a sludge sedimentation Jar test is performed to determine the optimal amount of polymer injected. The auxiliary coagulant supply pump 331 is also cut off when the water level in the inlet tank 100 drops below 10% or when the water level in the outlet tank 500 reaches 95% or more.

The sludge deposited in the circulation tank 200 and the settling tank 400 is periodically transferred to the sludge tank 700 using a sludge pump 711, and the supernatant of the settling tank 400 is a effluent tank, that is, an outflow tank 500. ), and from the outflow tank 500 through the discharge pump 511, the coal-based or palm-based activated carbon is compressed and fired to send the filtration tank 600 consisting of a carbon block filter in the form of a hollow cylinder column, which remains in the treated water. It should be discharged after final filtering of large particles of dust, rust, residual sludge, residual total organic carbon (TOC), odor, color, and THMs.

The sludge pump 711 can be controlled by visually observing the sludge in the settling tank 400 without being controlled by other devices. The amount of sludge accumulated in the settling tank 400 is too large to be pumped to the sludge tank 700 before being carried over to the outflow tank 500 . The frequency of sludge pumping is determined in consideration of the amount of sludge, and is usually carried out 2-3 times a day. The sludge pump 711 is also used to remove the sludge deposited in the circulation tank 200 .

A discharge tank discharge pipe 410 for discharging to the outflow tank 500 is connected and installed at the upper portion of the settling tank 400, and a sediment discharge unit 420 is provided at the lower portion of the settling tank 400 through a sludge supply pipe 710 It is connected to the sludge tank (700).

A water level sensor is installed in the outflow tank 500 including a discharge tank connected to the discharge tank discharge pipe 410 , and a discharge pump 511 is installed in the discharge water discharge pipe 510 coupled to the lower portion. The discharge pump 511 is controlled by a water level sensor installed in the discharge tank 500, and the water level sensor can measure 95%, 80%, and 25% position values, respectively, so that when the water level reaches 80%, the discharge pump 511 ), when it is less than 20%, the discharge pump 511 stops operating.

When the water level of the outlet tank 500 is 95% or more, the raw water supply pump 111 and the hydrochloric acid supply pump 121 . The brine supply pump 131 , the sodium hydroxide supply pump 321 , and the auxiliary coagulant supply pump 331 are stopped and the power supply of the power supply is cut off. At this time, the filter of the filtration tank 600 is replaced.

On the other hand, the sludge collected in the sludge tank 700 is discharged in the form of a cake with reduced moisture by the filter press 800 or a separate belt press or centrifuge through the sludge supply pump 712, and the sludge treated water generated at this time is It is returned through the sludge treated water transport pipe 810 with a separate pump and sent to the influent tank 100 for treatment.`

The front end of the influent tank 100 of the present invention is provided with a screen including a motor for removing the stencil, but since such a screen is generally applied, a description thereof is omitted. In addition, a TMS (Tele-Monitoring System) for measuring the water quality of the treated water passing through the inside of the influent tank 100 and the filtration tank 600 is provided, so that the water quality can be monitored remotely in real time.

The treatment range of the wastewater treatment reuse system of the present invention is heavy metal, organic material, TDS, hardness, ammonia, nitrogen and phosphorus compound, etc., and is designed to satisfy various effluent standards by treating contaminants contained in various water sources. It consists of electrocoagulation process, solid-liquid separation and filtration process, but the pretreatment process and solid-liquid separation and filtration process can be freely designed according to the conditions of the installation site.

Therefore, the wastewater treatment reuse system of the present invention is difficult to decompose or has a small installation area, or when rapid wastewater treatment within 1 hour is required. It electrocoagulates, recirculates the treated water, and passes through the PH control tank 300, the settling tank 400, the outflow tank 500 and the filtration tank 600, which causes oxidation and reduction reactions without applying electric energy to the powder electrode. to increase the efficiency of contaminant removal, maximize the specific surface area to volume, and secure rapid cohesive reactivity even with low energy use. It has the effect of treating wastewater in an environmentally friendly way without the input of chemicals.

In addition, the present invention widely removes organic and inorganic pollutants, separates them into non-toxic metal oxides, reduces installation and operating costs, as well as high pollutant removal rates in specific wastewater, and produces hydrogen peroxide and ozone and has a sterilizing effect.

In addition, in the present invention, there is no need to add chemicals in addition to pH correction, the production is reduced by optimizing the sludge in the sludge tank 700 , and various pollutants can be treated simultaneously.

And, in the present invention, the raw water introduced from the influent tank 100 to the circulation tank 200 moves from the bottom to the top and passes through the electrical coagulation section 220 where electrical coagulation is made between the powder electrodes 211, and the circulation section ( 230), but the scum floating on the upper part is transferred to the scum chamber 240, the sediment sinking to the lower part is discharged to the sediment outlet 205, and the treated water that has not been transferred to the supernatant inlet 250 is transferred to the circulating pump 261 ) is sucked in and transferred back to the electrical coagulation section 220, but by recirculating at a faster flow rate, it is possible to prevent scale in the powder electrode 211 and mix raw and treated water evenly, as well as energy efficiency and electrode life. heightening effect.

In addition, the present invention provides a powder electrode 211 that is formed in a rectangular parallelepiped shape by pressing porous null iron, and is dissolved by aggregating contaminants contained in influent water supplied from the outside using the principle of electrical coagulation, and the powder electrode 211 ), the electrode terminal connecting rod 212 for supplying electricity is inserted and fixed, and an inflow groove 213a is formed so that the inflow water passes between the powder electrodes 211 on the lower surface, and the electrode terminal connecting rod 212 is a powder electrode. A powder electrode fixing device 210 that is installed to be positioned higher than the 211 and includes a holder 213 having a treated water discharge groove 213c through which the treated water from which contaminants are removed from the powder electrode 211 is discharged on the upper side thereof. is inserted into the electric coagulation section 220 of the circulation tank 200 to uniformly treat the influent and increase the water treatment efficiency.

On the other hand, in the present invention, by supplying the diluted treated water first passing through the electrical coagulation section 220 in the circulation tank 200 to the electrical coagulation section 220 into which raw water flows, the contact time with the powder electrode 211 The stability of the reaction is ensured by having sufficient It works.

In addition, the present invention has the advantage of continuously treating sewage and wastewater by controlling the number of powder electrodes 211, applied current, and flow rate per minute according to the daily treatment capacity.

In addition, in the present invention, the powder electrode fixing device 210 is inserted into the electric coagulation section 220 of the circulation tank 200, and the other powder electrode fixing device 210 and the front and rear surfaces are arranged to abut against each other, and are arranged side by side. A plurality of electrode terminal connecting rods 212 are connected to the bus bar 222 at the top of the plurality of powder electrode fixing devices 210 arranged, and electricity is supplied from the bus bar 222 to the circulation tank 200 for electrical coagulation. There is also the advantage of being able to treat a large amount of sewage and wastewater by adjusting the size.

In the present invention, even when a plurality of powder electrode fixing devices 210 are arranged side by side in the electrical coagulation section 220 of the circulation tank 200, the distance between the powder electrodes 211 can be maintained equally, so that the electrocoagulation reaction can be uniformly performed. There are also advantages to making it happen.

In the present invention, the inflow water flowing in through the inflow grooves 213a formed at regular intervals on the lower surface of the powder electrode fixing device 210 rises along the powder electrode 211 in which the powder electrode 211 is stacked, and the powder electrode 211 is uniformly dissolved. There is also an advantage in that the replacement time of the powder electrode 211 can be easily known so that the powder electrode 211 can be replaced when the voltage increases as the distance between the powder electrodes 211 increases.

In the present invention, the powder electrode 211 is stacked and inserted into the holder 213 into which the electrode terminal connecting rod 212 is inserted, and the powder electrode 211 is placed in contact with the electrode 212a of the electrode terminal connecting rod 212. A spacer 214 is inserted so that electricity is stably supplied from the electrode terminal connecting rod 212 to the powder electrode 211, and the lower surface of the holder 213 is slidably and detachably installed from both sides of the powder electrode 211 ) has the advantage of being easy to replace.

And, in the present invention, it is possible to reuse the treated water to industrial water, agricultural water, or raw water by not using chemicals. It not only does not require cleaning, but also has an excellent cohesive effect.

In addition, in the present invention, hydrogen gas is generated on the surface of the powder electrode 211 by periodically switching the negative electrode and the positive electrode of the electrode terminal connecting rod 212, so that the powder electrode 211 can be easily and cleanly managed. have.

100: influent tank 110: raw water supply pipe
111: raw water supply tank 112: electrical conductivity sensor
113: pH sensor 114: first flow meter
120: hydrochloric acid tank 121: hydrochloric acid supply pump
130: brine tank 131: brine supply pump
200: circulation tank 201: raw water inlet
202: supernatant water outlet 203: first bulkhead
204: second bulkhead 205: sediment outlet
206: sludge outlet 207: recirculation suction pipe coupling part
208: branch pipe coupling part
210: powder electrode fixing device 211: powder electrode
212: electrode terminal connecting rod 212a: electrode rod
213: holder 213a: inlet groove
213b: insertion groove 213c: treated water discharge groove
214: spacer 220: electric coagulation section
221: partition plate 222: bus bar
223: electric wire 230: circulation section
240: scum chamber 241: projection
242: scum removal pipe 250: upper water inlet
251: diaphragm 260: recirculation suction pipe
261: circulation pump 262: branch pipe
263: second flow meter 270: cover
280: external support 290: internal support
300: PH adjustment tank 310: supernatant water discharge pipe
320: sodium hydroxide tank 321: sodium hydroxide supply pump
330: auxiliary coagulant tank 331: auxiliary coagulant supply pump
340: settling tank discharge pipe 350: agitator
400: sedimentation tank 410: discharge tank discharge pipe
420: sediment discharge part
500: outflow tank 510: discharge water discharge pipe
511: discharge pump
600: filtration tank
700: sludge tank 710: sludge supply pipe
711: sludge pump 712: sludge supply pump
800: filter press 810: sludge treated water transfer pipe

Claims (10)

an inflow water tank 100 in which raw water is stored, the raw water supply pipe 110 is coupled, and the raw water supply pump 111 is connected to the raw water supply pipe 110 to supply raw water to the next treatment process;
a circulation tank 200 provided as a reaction tank in which electrical coagulation of raw water supplied through the raw water supply pipe 110 and circulation of treated water are made;
a PH adjusting tank 300 connected to the circulation tank 200 and the supernatant water discharge pipe 310 to adjust the pH of the supernatant water;
a sedimentation tank 400 in which sludge is precipitated from the treated water transferred from the PH adjustment tank 300;
an outlet tank 500 comprising a discharge tank into which the supernatant water transferred from the settling tank 400 flows;
a filtration tank 600 for filtering the effluent discharged from the outlet tank 500 with a filter;
and a sludge tank 700 into which the sludge transferred from the circulation tank 200 and the settling tank 400 is introduced and concentrated;
The circulation tank 200,
The upper part is opened, and the raw water supply pipe 110 is connected to the upper part of one side to form a raw water inlet 201 through which raw water is introduced, and the supernatant water outlet 202 connected to the supernatant water outlet pipe 310 is formed on the opposite side. It consists of a reactor that becomes; The raw water is introduced from the lower part by the first partition wall 203 spaced apart from the raw water inlet 201, the powder electrode fixing device 210 is inserted and mounted, and the electric coagulation section is performed by the supply of electricity ( 220) and; The treated water that has passed through the electrical coagulation section 220 is transferred from the upper part of the second bulkhead 204, the scum floats at the upper part, and the sediment is discharged to the lower sediment outlet 205, and the treated water is recycled. a circulation section 230 consisting of a ration tank; a scum chamber 240 provided with a plate at the front in the upper part of the circulation section 230, having a higher height than the plate at the rear, and preventing supernatant water from being discharged by a blocked diaphragm 251; a supernatant water inlet 250 separated by the scum chamber 240 and the diaphragm 251 and discharged to the supernatant water outlet 202 by introducing supernatant water into a supernatant water inlet formed at the lower portion; A recirculation suction pipe 260 to which a circulation pump 261 is connected and installed for recirculating by sucking the treated water that has not moved to the supernatant water inlet 250 from the lower portion of the supernatant water inlet 250 and transferring it to the electric coagulation section 220 for recirculation. A wastewater treatment reuse system comprising a.
delete According to claim 1,
Electrocoagulation in the circulation tank 200 is made through a powder electrode,
The powder electrode fixing device 210 for fixing the powder electrode,
a powder electrode 211 that is formed by compressing porous null iron to form a rectangular parallelepiped shape, agglomerates and dissolves contaminants contained in influent water supplied from the outside;
A pair of electrode terminal connecting rods 212 including electrode rods 212a for supplying electricity to the plurality of powder electrodes 211 and protruding higher than the powder electrodes 211 disposed with the plurality of powder electrodes 211 interposed therebetween. )Wow;
The front and rear surfaces and the upper surface are opened, the powder electrode 211 and the electrode terminal connecting rod 212 are inserted inside, and the inflow groove 213a through which the inflow water passes between the powder electrodes 211 on the lower surface is spaced apart by a predetermined interval. The holder 213 is formed, on both sides of which an insertion groove is formed into which the electrode rod 212a of the electrode terminal connecting rod 212 is inserted in the longitudinal direction, and a treated water discharge groove is formed in the upper side of the side surface for discharging the treated water from which the contaminants are removed. including;
The central width of the holder 213 is narrower than the width of both sides, and the front and rear surfaces of the holder 213 are half of the inlet groove 213a on the lower surface. A wastewater treatment reuse system provided to be spaced apart from the powder electrode 211 of the holder 213 at the same distance.
According to claim 1,
Hydrochloric acid and brine from the hydrochloric acid tank 120 and the brine tank 130 are supplied to the raw water supply pipe 110 by the hydrochloric acid supply pump 121 and the brine supply tank 131,
The PH adjustment tank 300 is a sodium hydroxide tank 320 and an auxiliary coagulant tank 330 in which sodium hydroxide and an auxiliary coagulant are supplied by a sodium hydroxide supply pump 321 and an auxiliary coagulant supply pump 331, and a supernatant water discharge pipe ( 310), a wastewater treatment reuse system that agitates the treated water.
According to claim 1,
The circulation pump 261 adjusts the flow rate of the treated water discharged from the recirculation suction pipe 260 to the branch pipe 262 connected to the electrical coagulation section 220 according to the quality of the raw water,
A sludge discharge port 206 for discharging the coagulated sludge is formed in the lower portion of the electric coagulation section 220. A wastewater treatment reuse system.
4. The method of claim 3,
The powder electrode 211 is made by pressing the porous null iron powder,
A powder electrode 211 is stacked and inserted into the holder 213 into which the electrode terminal connecting rod 212 is inserted, and a spacer 214 so that the powder electrode 211 comes into contact with the electrode 212a of the electrode terminal connecting rod 212. is inserted into the insertion groove (213b),
The holder 213 is arranged and coupled to the other holder 213 in front and back surfaces, and a plurality of electrode terminal connecting rods 212 are connected to the bus bar 222 on the top of the plurality of holders 213 to receive electricity. Sewage water treatment reuse system.
The method of claim 1,
When the amount of sludge accumulated in the settling tank 400 increases, the sludge pump 711 connected to the sludge supply pipe 710 connecting the settling tank 400 and the sludge tank 700 is carried over to the outflow tank 500 before being carried over. A wastewater treatment reuse system that pumps the sludge tank (700) and removes the sludge deposited in the circulation tank (200).
5. The method of claim 4,
The discharge pump 511 installed in the discharge water discharge pipe 510 connected to the discharge tank 500 is controlled by a water level sensor installed in the discharge tank 500, and operates when the water level reaches a first set value, and the second If it is below the set value, it stops, and if it is above the third set value, stop the raw water supply pump 111, hydrochloric acid supply pump 121, brine supply pump 131, sodium hydroxide supply pump 321, and auxiliary coagulant supply pump 331 and turn on the power. A wastewater treatment reuse system in which the power supply is cut off.
According to claim 1,
The filtration tank 600 has a hollow cylinder-type compressed carbon block filter obtained by stirring coal-based or palm-based powdered activated carbon and ultra-high molecular weight polyethylene (UHMW PE), putting the mixture in a mold, compressing, firing, and cutting to a desired size. Sewage water treatment reuse system.
According to claim 1,
The scum chamber 240 and the supernatant water inlet 250 have the same height as the lower ends, and only the treated water passing the lower part of the scum chamber 240 flows into the supernatant water inlet 250. A wastewater treatment reuse system.

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