KR20050093725A - An oxidizing pressurized uprising apparatus - Google Patents

Abstract

The present invention relates to a pressurized flotation tank for purifying raw water by using an inlet gas during pretreatment or post-treatment of raw water in wastewater or water treatment. More specifically, ozone bubbles are introduced by introducing ozone as an oxidizing gas together with incoming raw water. The present invention relates to an oxidative pressurized flotation device for simultaneously treating organic matter remaining at the same time with the rise of organic matter and hardly decomposable substances, odorous substances, viruses and bacteria.

Oxidation pressurized flotation device according to the present invention is installed a hopper-shaped partition with an upper opening to the bottom of the pressurized flotation tank equipped with an ozone gas collecting device at the top and pressurized tank and pressurized to inject ozone into the pressurized flotation tank through the partition wall. It comprises a ozone liquefied water generator composed of a pump and an ozone generator.

In addition, in order to widen the oxidizing zone where ozone is in contact with the raw water, ozone is partially introduced into the raw water inlet pipe, and a large number of ozone is introduced into the lower portion of the pressurized flotation tank. The treatment water outlet pipe is configured to be positioned below the pressure flotation tank so as to be far from the circulation pipe for transporting the treated water circulated.

The present invention configured as described above uses a strong oxidizing ozone generated in the ozone generator to oxidize and decompose by contacting with raw water in a pressure flotation tank, and at the same time, floats organic flocs aggregated in raw water using ozone bubbles. In the flotation tank, the treatment water rises and the oxidation occurs simultaneously.

In addition, widening the oxidizing zone extends the residence time for the contact between ozone and raw water to increase the treatment efficiency, and reuses the ozone collected through the gas collection device, and reduces the cost of the treatment facility by automating the ozone production by identifying the residual ozone amount. There is no need to install a separate odor prevention facility.

Description

An oxidizing Pressurized Uprising Apparatus}

The present invention relates to a pressurized flotation tank for purifying raw water by using an inlet gas during pretreatment or post-treatment of raw water in wastewater or water treatment, and more particularly, ozone as an oxidant gas together with raw water introduced by reacting with a flocculant. The present invention relates to an oxidative pressurized flotation device which simultaneously handles the treatment of residual organic materials, hardly decomposable substances, odorous substances, viruses, and bacteria by injecting ozone bubbles.

Dissolved Air Flotation (DAF) uses compressed air as a very fine bubble in the liquid in a pressurized flotation tank, which attaches to the organic flocs and floats upwards. The scum skimmer is removed by flotation, and the flotation concentrate is effectively used to concentrate the waste sludge discharged from activated sludge method, aerobic digestion tank and suspended growth nitrification process.

However, the pressurized flotation tank as described above has a problem in that a separate removal facility has to be installed in order to remove odors and viruses and bacteria caused by hardly decomposable substances in wastewater or water purification process.

As a method for solving the above problems, there is a dissolved ozone concentration using ozone (Dissolved Ozone Flotation, DOF). The dissolved floating concentration (DOF) as described above adds ozone having a strong oxidizing power instead of air.

Ozone can easily make the required amount with air and power, and it has a strong sterilization effect regardless of the pH change. In addition, there is no secondary pollution such as an increase in inorganic salt concentration, sludge generation, and formation of carcinogenic trihalomethane (THM), and it oxidizes materials that other oxidants cannot handle and the processing time is very short.

Referring to FIGS. 1 and 2, a conventional flotation apparatus using ozone is as follows.

As shown in the drawing, the conventional pressure flotation device 1 using ozone constitutes a cylindrical pressure flotation tank 10 and an inner reaction tank 11 inside the pressure flotation tank 10, and air or ozone. And an ozone generator 21 for generating water, and a pressurized water generator 20 for circulating the treated water circulated including ozone into the inner reaction tank 11 of the floating pressurized tank 10 again.

The pressurized water generator 20 is composed of a pressurized tank 23, a pressurized pump 22, and a pressurized water pipe 24, and ozone generated in the ozone generator 21 is circulated through the circulation pipe 13 together with the treated water. The pressurized pump 22 is introduced into the pressurized tank 23 and again communicated with the inlet pipe 12 through which the raw water is introduced through the pressurized water pipe 24 to be introduced into the inner reaction tank 11 of the pressurized flotation tank 10. do.

The raw water introduced through the raw water inlet pipe 12 is introduced into the inner reaction tank 11 together with the coagulant in the reaction agglomeration tank (not shown), which is a pre-process, and is included in the circulating water that is introduced into the circulating treated water ( 22) and the ozone liquefied by the pressure difference in the pressure tank 23 is changed from the liquefied state to the vaporized state, that is, microbubbles by the pressure difference, adheres to the flocculated organic flocs and floats the floc, By causing oxidation reaction to remove sterilization and odor.

However, the conventional oxidative pressure flotation device 1 configured as described above is directly connected to the pressurized water pipe 24 to the inlet pipe 12 of the pressure flotation tank 10 to form a bubble so that the inlet pipe 12 Combination between the air bubbles is made while passing through the problem of low air bubble formation efficiency.

In addition, the incoming raw water is preferably treated in contact with ozone for a suitable residence time, but a part of the storage tank 15 formed above the pressurized flotation tank 10 is discharged to the outside through the treated water outlet pipe 14. Since some circulate through the circulation pipe 13, there is a problem in that the oxidation zone A in which the raw water contacts ozone in the pressurized flotation tank 10 is short and the contact residence time is short, thereby significantly lowering the treatment efficiency.

This is because the contaminated raw water in contact with ozone in the flotation tank 10 is discharged to the outside through the treated water outlet pipe 14 without being in contact with ozone again.

Therefore, it is necessary to lengthen the time for the incoming raw water to come into contact with ozone and to improve the location of the discharged raw water through the oxidation / injury process.

The present invention is to solve the above problems, in contact with the coagulated raw water and ozone in one oxidizing pressure flotation tank to cause the injury and oxidation at the same time to remove the hardly decomposable substances, bacteria and odors with organic materials It is aimed at processing.

In addition, the oxidized pressurized flotation device has a structure in which a part of the circulated treated water containing ozone flows through the inflow pipe and a majority flows directly into the bottom of the pressure flotation tank so that the raw water flowing in contact with ozone is long. The purpose is to.

In addition, an object of the present invention is to provide an oxidative pressurized flotation device that forms a hopper-shaped partition wall at a lower portion so that an oxidation zone in which raw water comes into contact with the introduced ozone and a treated water outlet pipe through which treated water is discharged is provided. .

In order to achieve the above object, the oxidative pressure flotation device according to the present invention is a pressure flotation device that floats and removes organic flocs in raw water using microbubbles. The ozone liquefied water generating apparatus for mixing a predetermined size of the pressure flotation tank, the circulated circulating treated water and the oxidizing gas to be introduced into the pressure flotation tank, and the oxidized gas flowing out of the pressure flotation tank to collect the ozone liquefied water. It is composed of a gas collecting device to be transferred back to the generator to be reused.

The pressurized floatation tank has a tubular shape of a predetermined size, and constitutes a motor installed on an upper portion of the upper cover capable of completely sealing the pressurized floatation tank and a rotating shaft rotating through the center of the pressurized flotation tank, and the raw water is moved to the inner center. It is configured to include an inner reaction tank of a predetermined size in communication with the incoming raw water inlet pipe.

In addition, the supernatant filtered by the scum is once again formed by the one side baffle to form a reservoir of a predetermined size to be stored, the circulation pipe is connected to one side of the reservoir to circulate the supernatant, that is, the treated water.

In addition, a scum skimmer is installed on the top of the rotating shaft to collect and remove scum, which is an organic mass, floated on the upper part of the pressure flotation tank, and the scum is pushed to the scum discharge container formed on one side by using the force of the motor and the rotating shaft. The scum is discharged to the outside through the scum discharge pipe, and the scraper is collected by scraping the sludge that has sunk to the lower side and then sent to the sludge outflow pipe.

In addition, a lower portion of the pressurized flotation tank is provided with a hopper-type partition wall that is open to the upper part without being affected by the direction of movement of the scraper, and the treatment water outlet pipe is formed at the position lower than that of the hopper-shaped partition wall to be treated. Drain the water to the outside.

The treatment water outlet pipe is formed at a distance from the circulation pipe to prevent the treatment water to be circulated and to be discharged directly through the treatment water outlet pipe, and the hopper-shaped partition wall has ozone introduced from below. It is to prevent the ozone liquefied water from being discharged through the treated water outlet pipe and to increase the contact residence time by widening the oxidation zone where ozone and raw water contact each other.

The ozone liquefied water generator is an ozone generator that generates ozone, which is a strong oxidizing gas, and one or more ejectors supplied with the ozone into the circulation pipe and the pressurized water pipe as needed, and pressurized in communication with the ejector connected to the circulation pipe. It consists of a pump and a pressurized tank.

The ozone generator may be replaced with a gas generator that generates a gas such as plasma having strong oxidation power as well as ozone.

Then, the circulating treated water and ozone introduced into the pressurized tank through the circulation pipe and the like are ozone liquefied water in which ozone is liquefied by the pressure of the pressurized pump and the pressurized tank, and is introduced into the lower portion of the pressurized flotation tank through the pressurized water pipe.

The gas collecting device sends ozone collected through the upper portion of the pressurized flotation tank to the ejector through the gas transfer pipe, and makes ozone available again.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing an oxidative pressure floating apparatus according to the present invention, Figure 4 is a flow chart showing the flow of the oxidative pressure floating apparatus according to the present invention, Figure 5 is an oxidation zone of the oxidative pressure floating apparatus according to the present invention. Schematic shown.

As shown, the oxidative pressure flotation device 100 according to the present invention is a cylindrical pressure flotation tank 110 and the pressure flotation tank 110 to form a gas collecting device 120 for collecting ozone gas to the top. It consists of an ozone liquefied water generator 130 for supplying strong oxidizing ozone into the.

The cylindrical pressure floating tank 110 is a motor (M) installed on the top cover 114 of the floating tank, and the rotating shaft 112 is installed in the motor (M) to rotate in a state penetrating the center of the floating tank 110. ), And install the scum skimmer 111 so as to push the floc floating by the ozone bubbles generated by being connected to the rotary shaft 112 to the scum discharge container 113 formed integrally on the upper one side, without going injured It comprises a scraper 118 to collect the sludge from the lower portion sent to the sludge outflow pipe 119 and discharged.

In addition, a hopper-shaped partition wall 200 having an upper opening is integrally formed at the lower portion of the floating tank without affecting the activity of the scraper 118.

And, forming a reservoir 115 for collecting the supernatant water flowed through the weir formed on the baffle 116 to the upper side and connected to the circulation pipe 40 to communicate with one side of the reservoir 115, that is, the circulation process The water is sent to the ozone liquefied water generator 130.

In addition, the inner upper center is configured to include an inner reaction tank 117 to a predetermined size so as to communicate with the raw water inlet pipe 30 for introducing raw water from the outside, the lower portion than the height of the hopper-shaped partition wall 200 The treatment water outlet pipe 300 for discharging the treatment water to the outside of the pressure flotation tank 110 is configured to be located farthest from the circulation pipe 40. The treatment water outlet pipe 300 is formed to penetrate the treatment water tank 310 formed on one side of the pressure floating tank 110 up and down, and the amount of treated water naturally discharged using the water level control valve 320 at the top. Adjust

The pressurized ozone liquefied water generator 130 is formed outside the pressurized flotation tank 110 to form an ozone generator 134, a pressurized tank 131, and a pressurized pump 132 and an ejector 133 that generate ozone. It is configured to include.

The pressurization tank 131 is a tank having a predetermined size to oxidize and circulate the treated water and ozone introduced through the pressurization pump 132 by pressurization.

In addition, the ozone liquefied water generating device 130 is communicated through the pressure flotation tank 110 and the pressurized water pipe 60 and the circulation pipe 40, formed on one side of the storage tank 115 of the flotation tank 110. Through the circulation pipe 40, the circulating treated water is transferred by the suction force of the pressurized pump 132, and the circulated treated water is passed through the ejector 133 and the pressurized pump 132 and then pressurized tank 131 with ozone. Flows into.

At this time, one side of the circulation pipe 40 is formed in communication with the ejector 133, the ejector 133 is mixed with the oxidized gas, that is, ozone generated in the ozone generator 134, with the circulating treated water and pressurized The pump 132 is again conveyed to allow the circulating treated water to circulate and mix well with ozone.

Therefore, the circulating treated water becomes ozone liquefied water having strong oxidizing power, including ozone introduced through the ejector 133.

Ozone liquefied water passing through the pressurized pump 132 and the pressurized tank 131 passes through the pressurized water pipe 60 and a part of the ozone liquefied water into the inlet pipe 30 that introduces raw water into the inner reaction tank 117 of the floating tank 110. About 90% is directly introduced into the lower portion of the pressurized flotation 110, mixed into the flotation via the hopper-shaped partition 200 of the flotation 110, and reacted with a floc to oxidize. And ozone bubbles float flocs.

At this time, the circulation pipe 40 and the pressurized water pipe 60 is configured to include a control valve 80 to one side to adjust the amount of material to be conveyed.

The gas collecting device 120 installed above the cover 114 of the pressure flotation tank 110 is exposed to the air while the ozone, which is a gas, is not completely dissolved in raw water and floats through the pressure flotation tank 110. As the device for collecting the ozone to form the ozone collecting cover 122 to the upper portion of the pressure flotation tank 110, the collected ozone flows into the ejector 133 again through the gas transfer pipe 50 is reused.

At this time, by installing the ozone automatic measuring device 121 on one side of the gas transport pipe 50 to collect and transport, it is automated to adjust the ozone production amount in the ozone generator 134 freely by adjusting the voltage according to the residual ozone amount.

In another embodiment, the ejector 133 ′ communicated by the ozone generator 134 and the gas transfer pipe 50 ′ is directly below the hopper-shaped partition wall 200 of the pressurized flotation tank 110 as needed. Included in the pressurized water pipe 60 is connected.

This increases the amount of ozone generated with the ejector 133 installed in communication with the circulation pipe 40, and the ozone enters the lower portion of the pressurized flotation tank 110 directly through the pressurized water pipe 60. There is an effect that the oxidation reaction efficiency is further increased.

Looking at the operating state of the oxidative pressure floating apparatus 100 according to the present invention and the processing of influent water is as follows.

First, raw water is agglomerated by a coagulant in the reaction coagulation tank 70, which is a pre-processing step of the oxidative pressure flotation device 100, through the raw water inlet pipe 30 to the inner reaction tank 117 of the flotation tank 110. Inflow.

At this time, the raw water introduced through the inlet pipe 30 is mixed with the pressurized ozone liquefied water introduced through the pressurized water pipe 60, the pressurized ozone liquefied water is gasified by the difference between the atmospheric pressure and the inner reaction tank 117 Will come in.

The introduced raw water reacts with ozone having a strong oxidizing power to remove odors of organic substances, kills bacteria and viruses, forms agglomerate floc by flocculant, and presses flotation due to adhesion and buoyancy of ozone bubbles contained in raw water. It rises to the top of 110.

In addition, the upper scum skimmer 111 of the floating tank 110 collects the scum floating while moving along the rotation axis rotated by the motor (M) sent to the scum discharge bin 113 and the collected scum formed on one side It is discharged to outside through the scum discharge pipe.

In addition, the lump flocks that are not injured due to the heavy organic material, that is, the sludge is collected in the lower part of the flotation tank by the scraper 118 and discharged to the outside through the sludge outflow pipe 119 communicating with the lower side of the flotation tank.

And, the scum is removed from the upper supernatant is circulated by the baffle 116 to the treated water circulated once more scum and ware flow to the reservoir 115 and the circulation pipe communicated to one side of the reservoir 115 It is transferred to the pressure ozone generator 130 through the (40).

At this time, the circulating treated water flowing into the pressurized pump 132 through the circulating pipe 40 is mixed with the circulated treated water by the ozone generated by the connected ejector 133 and the ozone generator 134 and becomes the ozone liquefied water. Through adjustment of the control valve 80 is introduced into the pressurized tank 131, the pressurized ozone liquefied water is mixed by the high pressure in the pressurized tank 131, some 10% of the liquid to the inlet pipe 30 About 90% of the water is transferred directly to the bottom of the flotation tank between the hopper-shaped partitions 200, and the pressurized ozone liquefied water is gasified and oxidized as much as possible with the raw water introduced in the flotation tank 110. The flocculated floc is caused by rising ozone bubbles.

The hopper-shaped partition wall 200 formed at the lower side immediately exits to the treated water outlet pipe 300 installed to communicate with the pressurized ozone liquefied water mixed with the ozone through the pressurized water pipe 60. At the same time it provides a wide oxidation zone (B) to the top so that ozone reacts sufficiently with the raw water in the flotation tank (110).

Accordingly, ozone introduced into the lower portion of the floating tank 110 in the form of pressurized ozone liquefied water reacts with the raw water with almost no dead zone in the floating tank 110, and the ozone bubble floating upward with the organic floc is The gas is collected by the gas collecting device 120 installed above the pressurized flotation tank 110, and is introduced into the ozone liquefied water generating device 130 through the gas transfer pipe 50 and reused.

In addition, the treated water treated with the suspended solids in the raw water is treated water tank 310 formed integrally on the outside of the floating tank 110 along the treated water outlet pipe 300 installed in the lower portion of the pressure floating tank 110. The treatment water outlet pipe 300 is formed to a predetermined height through the treatment water tank 310 and includes a water level control valve 320 upward.

As the water level control valve 320 opens and closes, the amount of treated water that is naturally dropped according to the water level in the pressure floating tank 110 is adjusted. The treated water passing through the treated water tank 310 removes suspended matter and dissolved ozone through a separate sand filter and an activated carbon filter.

In another embodiment, if necessary, the ejector 133 'communicated by the ozone generator 134 and the gas transfer pipe 50' is directly connected to the lower portion of the hopper-shaped partition wall 200 of the pressure flotation tank 110. It can be installed in the pressurized water pipe 60.

This increases the amount of ozone generated with the ejector 133 installed in communication with the circulation pipe 40, and the ozone enters the lower portion of the pressurized flotation tank 110 directly through the pressurized water pipe 60. There is an effect that the oxidation reaction efficiency is further increased.

Oxidation pressurized flotation device 100 according to the present invention as described above constitutes a hopper-shaped partition wall 200 to the lower portion of the pressurized flotation tank 110 and the treatment water outlet pipe far from the circulation pipe 40 ( By installing 300), the oxidation zone B of raw water by ozone is formed as wide as possible and the contact residence time is long.

In addition, ozone is reused by using the ozone collecting device 120 and the automated oxidative pressure floating apparatus 100 is configured by using devices such as an ozone automatic measuring device 121 and an automatic control device (not shown).

The present invention described above is possible to those skilled in the art to which the present invention pertains various modifications and changes can be made within the scope without departing from the technical spirit of the present invention described above embodiments and the accompanying drawings It is not limited to.

The oxidative pressurized flotation device according to the present invention made as described above oxidizes raw water, which is flocculated by the strong oxidizing ozone generated in the ozone generator to form a floc, and floats to form a flocculated material together with an organic material. It can treat bacteria and odors at the same time.

In addition, ozone is introduced into the lower part of the flotation tank and the flow is regulated using a hopper, and the treated water outlet pipe is installed separately from a reservoir connected to the circulation pipe which is connected to the upper part of the pressurized flotation tank. It minimizes the escape to the treated water pipe and widens the oxidation zone to maximize the treatment efficiency by ozone.

1 is a block diagram showing a pressure flotation according to the prior art.

2 is a schematic view showing an oxidation zone of a pressure flotation tank according to the prior art;

Figure 3 is a block diagram showing an oxidative pressure floating apparatus according to the present invention.

Figure 4 is a flow chart showing the flow of the oxidative pressure floating apparatus according to the present invention.

5 is a schematic view showing an oxidation zone of the oxidative pressure floating apparatus according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100: oxidative pressure floating device 30: raw water inlet pipe

40: circulation pipe 50: gas transfer pipe

60: pressurized water pipe 110: pressurized floating tank

120: ozone gas collecting device 121: ozone automatic measuring device

122: ozone collecting cover 130: ozone liquefied water generator

200: hopper bulkhead 300: treated water outflow pipe

A, B: oxidation zone

Claims (8)

In a pressure flotation device that floats and removes organic flocs in raw water using microbubbles, A raw water inlet pipe for introducing raw water on one side and a circulation pipe for circulating the treated water on one side of the upper side, and forming a treated water outlet pipe for discharging the treated water to a place far away from the circulation pipe, and a hopper type at the bottom Cylindrical pressure flotation tank including a partition of; An ozone liquefied water generator for generating ozone and introducing ozone liquefied water mixed with circulated treated water and ozone to the lower portion of the pressurized flotation tank; And a gas collecting device which collects the gasified ozone to the upper portion of the pressurized flotation tank and retransmits it to the ozone liquefied water generator. The method of claim 1, The treatment water outlet pipe is oxidized pressure flotation device, characterized in that installed in the lower position than the hopper-shaped partition wall under the pressure flotation tank. The method according to claim 1 or 2, The treatment water outflow pipe penetrates the treatment tank formed on the outside of the pressure flotation tank up and down, and an oxidative pressure flotation device, characterized in that it comprises a water level control valve at the top. The method of claim 1, The ozone liquefied water generator includes an ejector formed in communication with a pressure pump on one side of the circulation pipe; An ozone generator for generating and supplying ozone to the ejector; A pressurized pump communicating with the circulation pipe and partially circulating the circulated water to the ejector, and partially transferring ozone to a pressurized tank including ozone; Oxidation, characterized in that composed of a pressurized tank mixed with circulating treated water and ozone introduced through the pressurized pump through a high pressure into an liquefied ozone water and put into the bottom of the hopper-shaped partition wall of the pressurized flotation tank through a pressurized water pipe. Pressurized flotation system. The method of claim 4, wherein The pressurized tank is an oxidizing pressurized flotation device, characterized in that a portion of ozone liquefied water flows into the raw water inlet pipe. The method of claim 4, wherein Oxidation pressurized flotation device characterized in that it further comprises a separate ejector communicated by the ozone generator and the gas transfer pipe on one side of the pressurized water pipe connected to the lower portion of the pressurization tank in the pressure tank. The method of claim 1, The gas collecting device is an oxidizing pressurized flotation device comprising an ozone collecting cover of a size capable of completely sealing the upper portion of the pressurized flotation tank, and a gas transfer pipe transferring the collected ozone. The method of claim 7, wherein The gas collecting device is an oxidative pressurized flotation device, characterized in that it comprises an ozone automatic measuring device on one side.