JP4490908B2 - Wastewater treatment equipment - Google Patents

Description

This invention relates to wastewater treatment apparatus. As an example, the present invention relates to the regulation of the total amount of nitrogen by partial amendment of the Water Pollution Control Law, which came into effect from April 2004, and the use of harmful substances by the PRTR (Pollutant Release and Transfer Registry) Law, which came into effect from April 2001. about wastewater treatment apparatus that corresponds to the emission reduction. The present invention, for example, wastewater that processes mainly aminoethanol and dimethyl sulfoxide containing waste water and the high concentration nitrogen wastewater discharged from the semiconductor plant wastewater of two systems (high strength ammonia wastewater, waste developer and dimethylformamide waste liquid) The present invention relates to a processing apparatus. Aminoethanol is designated as a Class 1 Designated Chemical Substance in the PRTR method. Further, the present invention, as an example, malodor treatment can be, and initial costs can be microbial treatment neat relates excellent waste water treatment equipment in running costs and maintenance costs.

  Conventionally, wastewater containing aminoethanol and dimethylsulfoxide, for example, wastewater containing high-concentration aminoethanol and dimethylsulfoxide of about 3000 ppm is highly microbially toxic to aminoethanol. Could not process.

  In the case where the wastewater containing aminoethanol and dimethyl sulfoxide is treated with microorganisms, treatment with a concentration of aminoethanol and dimethyl sulfoxide as low as several hundred ppm is common.

  Therefore, wastewater containing high-concentration aminoethanol and dimethyl sulfoxide of 3000 ppm or more was concentrated to about 1/10 using an evaporator as a physical method, and the concentrated liquid was disposed as industrial waste.

  In the method of concentrating with this evaporator and discharging it from the factory as industrial waste, the concentrate corresponds to industrial waste, which has caused an increase in industrial waste from business establishments. Moreover, since the disposal method of the concentrate as the industrial waste is generally incineration, there are problems such as air pollution due to the use of fuel such as heavy oil. Further, the method of treating with an evaporator has a problem in that the initial cost, running cost, and maintenance cost are high because it consumes a large amount of energy and becomes a large plant facility.

  Moreover, the biological treatment method as a prior art is described in patent document 1 (patent 3467671). In this biological treatment method, the organic wastewater in the raw water tank is sequentially sent to the denitrification tank and the nitrification tank by a liquid feed pump and circulated between both tanks, so that ammonia nitrogen contained in the organic wastewater is circulated. Nitrogen gas is removed by reducing it to nitrogen gas using biological nitrification and denitrification, and using a suction pump, the sludge and treated water are separated by a filtration membrane unit immersed in the waste water in the nitrification tank. Denitrification method.

  As a feature of this nitrification / denitrification method, the pipe that feeds from the denitrification tank to the nitrification tank is branched in the middle, the tip of the branch is opened in the denitrification tank, and a part of the organic wastewater sent from the denitrification tank to the nitrification tank is It is blown out into the organic waste water in the denitrification tank.

  Further, another biological treatment method as a conventional technique is described in Patent Document 2 (Japanese Patent No. 3095620). This biological treatment method includes a denitrification tank into which raw water containing organic substances flows in, a nitrification tank into which a denitrification tank mixed liquid in the denitrification tank flows in, a nitrification liquid circulation channel that circulates the nitrification liquid in the nitrification tank to the denitrification tank, It is the processing method by the biological nitrogen removal apparatus provided with the nitrification tank aeration apparatus arrange | positioned in the tank.

  More specifically, in the biological nitrogen removing apparatus, a denitrifying bacterium immobilization carrier filling zone for capturing and removing suspended substances in the raw water flowing into the denitrifying tank is provided in the denitrifying tank. In addition, the raw water introduction flow path and the nitrification liquid circulation flow path are communicated with the lower position of the denitrifying bacteria-immobilized support filling zone of the denitrification tank, and trapped in the denitrifying bacteria-immobilized support filling zone at the bottom of the denitrification tank and removed. A sludge hopper is provided for depositing slag, and a hopper air diffuser is provided in the sludge hopper.

  However, as described above, conventionally, wastewater containing aminoethanol and dimethyl sulfoxide at a high concentration of about 3000 ppm has a high biotoxicity, and thus has generally not been treated with microorganisms. That is, wastewater containing aminoethanol and dimethyl sulfoxide at a high concentration that cannot be treated with microorganisms because of high biotoxicity has been treated by the above-described concentration method.

  However, the problem with the concentration method is that it consumes a large amount of energy and increases industrial waste due to the concentrated liquid.

On the other hand, it is required to efficiently treat malodor containing sulfur generated during waste water treatment while keeping initial cost, running cost and maintenance cost low.
Japanese Patent No. 3467671 Japanese Patent No. 3095620

Accordingly, an object of the present invention, along with the water to be treated and malodorous gas can efficiently process, is to provide a wastewater treatment equipment which can reduce the initial cost and running cost.

In order to solve the above-mentioned problem, the wastewater treatment method of this one reference example is a step of contacting malodorous gas and sludge,
A step of introducing the sludge brought into contact with the malodorous gas and the water to be treated into a high concentration microorganism tank having a microorganism concentration of 10,000 ppm or more.

  According to the wastewater treatment method of this reference example, the sludge containing the malodorous component of this malodorous gas is introduced into the high-concentration microorganism tank having a microorganism concentration of 10,000 ppm or more by contacting with the malodorous gas. Thereby, the malodorous component of the malodorous gas and the component to be treated can be treated at the same time. Therefore, according to the wastewater treatment method of this reference example, in addition to using the odor exclusion equipment and the wastewater treatment equipment, instead of using chemicals for treating odorous gas, for example, using sludge generated in wastewater treatment etc. is doing. Therefore, according to the present invention, water to be treated and malodorous gas can be treated efficiently, and initial cost and running cost can be reduced.

Moreover, the wastewater treatment apparatus of one reference example, the malodorous gas and sludge are introduced, and the contact portion for bringing the malodorous gas and sludge into contact with each other,
The sludge brought into contact with the malodorous gas and the water to be treated are introduced, and a high concentration microorganism tank having a microorganism concentration of 10,000 ppm or more is provided.

  According to the wastewater treatment apparatus of this reference example, the malodorous component of the malodorous gas is contained in the sludge by bringing the malodorous gas and sludge into contact with each other at the contact portion. And the sludge containing this malodorous component and to-be-processed water are introduce | transduced into a high concentration microorganisms tank whose microbial concentration is 10,000 ppm or more. Thereby, the malodorous component of the malodorous gas and the component to be treated can be treated at the same time. Therefore, according to the waste water treatment apparatus of the present invention, the malodor exclusion equipment and the waste water treatment apparatus can be used together. Moreover, instead of using chemicals for treating malodorous gas, for example, sludge generated by wastewater treatment or the like is used. Therefore, according to the present invention, water to be treated and malodorous gas can be treated efficiently, and initial cost and running cost can be reduced.

  Moreover, in the wastewater treatment apparatus of one reference example, the contact portion is a scrubber.

  According to the wastewater treatment apparatus of this reference example, the odor gas can be treated more efficiently by bringing the sludge and the odor gas into contact with the scrubber as the contact portion.

  In the wastewater treatment method of one reference example, the malodorous gas is a malodorous gas containing sulfur that is generated when wastewater containing aminoethanol and dimethylsulfoxide is biologically treated.

  According to the wastewater treatment method of this reference example, the malodorous gas containing sulfur generated when the wastewater containing aminoethanol and dimethyl sulfoxide is denitrified can be brought into contact with the sludge and treated in the high concentration microorganism tank. Therefore, malodorous gas containing sulfur that is generally difficult to treat can be treated at low cost.

  Moreover, in the waste water treatment apparatus of one reference example, the said high concentration microorganisms tank has a vinylidene chloride filling.

  According to this reference example, the presence of the vinylidene chloride filler in the high-concentration microorganism tank stabilizes the microorganisms, and efficiently converts the malodorous component of the malodorous gas contained in the sludge and the component to be treated in the treated water. Can be processed simultaneously.

  Moreover, in the wastewater treatment apparatus of one reference example, the high concentration microorganism tank has a submerged membrane.

  According to the wastewater treatment apparatus of this reference example, the presence of a submerged membrane in the high-concentration microbial tank eliminates a bulking phenomenon or the like peculiar to microbial treatment, and can ensure solid-liquid separation in the high-concentration microbial tank. Moreover, the sludge concentrated by the submerged membrane has a remarkable ability to absorb malodors.

In addition, in the wastewater treatment apparatus of one reference example , the contact portion where the malodorous gas and sludge are introduced and the malodorous gas and sludge are brought into contact with each other,
The sludge brought into contact with the malodorous gas and the water to be treated are introduced, and a high concentration microorganism tank having a microorganism concentration of 10,000 ppm or more is provided.
The high-concentration microorganism tank has a lower semi-anaerobic part and an upper aerobic part.

According to the wastewater treatment apparatus of this reference example , the high-concentration microorganism tank has a lower semi-anaerobic part and an upper aerobic part, so that the types of microorganisms that propagate in the high-concentration microorganism tank increase. The treated water and bad odor can be treated efficiently.

Further, the wastewater treatment apparatus of one reference example includes a denitrification nitrification treatment unit that denitrifies and nitrifies nitrogen wastewater, and the high-concentration microorganism tank is a nitrification tank included in the denitrification nitrification treatment unit.

According to the wastewater treatment apparatus of this reference example , both the treatment for nitrogen wastewater and the treatment for malodorous gas can be performed by the nitrification tank of the denitrification and nitrification treatment section, so that construction costs (initial costs) can be reduced.

Moreover, in the wastewater treatment apparatus of one reference example , the denitrification nitrification processing unit includes a denitrification tank, the nitrification tank, and an air lift pump that circulates water to be treated from the nitrification tank to the denitrification tank.

According to the wastewater treatment apparatus of this reference example, the wastewater can be efficiently treated by circulating the treated water between the denitrification tank and the nitrification tank, and the circulation can be performed by performing this circulation with an air lift pump. Can reduce the power for.

Moreover, in the waste water treatment apparatus of one reference example , the treated water treated by biological treatment or sludge generated by biological treatment is introduced into the denitrification and nitrification treatment section.

According to the wastewater treatment apparatus of this reference example , various minerals necessary for microorganisms are replenished to the denitrification and nitrification treatment section by using the treated water or the sludge generated by the biological treatment. Thereby, microorganisms are activated in the denitrification and nitrification treatment unit, and the denitrification and nitrification treatment is stabilized.

In the wastewater treatment apparatus of the present invention , the first wastewater treatment unit that performs the first wastewater treatment and generates malodorous gas, and the malodor that the second wastewater treatment and the first wastewater treatment unit generates. A second wastewater treatment unit for decomposing gas,
The first waste water treatment unit includes a first denitrification tank into which waste water containing aminoethanol and dimethyl sulfoxide is introduced, and a first nitrification tank having a semi-anaerobic part, and the second waste water treatment unit. A second denitrification tank into which nitrogen wastewater is introduced, a second nitrification tank having a semi-anaerobic part, a scrubber into which malodorous gas from the first wastewater treatment part is introduced, and the second A first sludge introduction section for introducing sludge from the nitrification tank to the scrubber; and a second sludge introduction section for introducing the sludge from the scrubber to the second nitrification tank.

According to the waste water treatment apparatus of the present invention , waste water containing aminoethanol and dimethyl sulfoxide is introduced into the first denitrification tank of the first waste water treatment unit. The malodorous gas generated by the first wastewater treatment unit is decomposed by a second wastewater treatment unit of a separate system that performs a wastewater treatment different from the first wastewater treatment unit. The second wastewater treatment unit for decomposing the malodorous gas has a second nitrification tank having a semi-anaerobic part, and the first sludge circulated between the second nitrification tank and the scrubber, The malodorous gas that is introduced into the scrubber from the wastewater treatment section is processed.

Therefore, according to the present invention , wastewater containing aminoethanol and dimethyl sulfoxide can be treated by the first wastewater treatment unit, and high-concentration nitrogen wastewater can be treated by the second wastewater treatment unit. The odorous gas generated at the second wastewater treatment section can be efficiently treated.

  Moreover, in the wastewater treatment method of one reference example, the malodorous gas is a gas containing a volatile organic compound.

  According to the wastewater treatment method of this reference example, sludge containing a volatile organic compound contained in malodorous gas can be introduced into a high-concentration microorganism tank to biologically treat the volatile organic compound contained in the malodorous gas. .

  Moreover, in the waste water treatment apparatus of one reference example, the malodorous gas is a gas containing a volatile organic compound.

  According to the wastewater treatment apparatus of this reference example, the volatile organic compound contained in the malodorous gas can be biologically treated by introducing the sludge containing the volatile organic compound contained in the malodorous gas into the high-concentration microorganism tank. .

Moreover, in the wastewater treatment method of one reference example , the step of contacting malodorous gas and sludge,
A step of introducing the sludge brought into contact with the malodorous gas and the water to be treated into a high concentration microorganism tank having a microorganism concentration of 10,000 ppm or more,
The high-concentration microorganism tank has a lower semi-anaerobic part and an upper aerobic part,
The sludge is sludge containing micro / nano bubbles.

According to the wastewater treatment method of this reference example , since the sludge is sludge containing micro-nano bubbles, microorganisms are activated in the high-concentration microorganism tank into which the sludge is introduced, and the malodorous gas component is activated. It can be efficiently decomposed by microorganisms.

  Moreover, in the waste water treatment apparatus of one Embodiment, the said sludge is sludge containing a micro nano bubble.

  According to the wastewater treatment apparatus of this embodiment, since the sludge is sludge containing micro-nano bubbles, microorganisms are activated in the high-concentration microorganism tank into which the sludge is introduced, and microorganisms that have activated the malodorous gas components. Can be efficiently decomposed.

  Micro-nano bubbles are bubbles containing both micro-bubbles (diameter 50 microns or less) and nano-bubbles (diameter 1 micron or less). According to the micro-nano bubble, it is considered to have a function of raising and maintaining dissolved oxygen in water. Further, since nanobubbles are bubbles having a diameter of 1 micron or less, it is considered that there is a direct action on living organisms at the cellular level, and in particular increases the activity of microorganisms. Further, typical functions of the micro / nano bubbles include a surface active action, a dirt component adsorption function, a high-speed washing function of an object surface, and a catalytic function.

  Moreover, in the waste water treatment method of one reference example, the volatile organic compound contained in the malodorous gas includes at least one of isopropyl alcohol, acetone, and butyl acetate.

  According to the wastewater treatment method of this reference example, sludge containing at least one of isopropyl alcohol, acetone, and butyl acetate as a volatile organic compound contained in the malodorous gas is introduced into a high-concentration microorganism tank. Thus, the isopropyl alcohol, acetone, butyl acetate and the like can be easily decomposed by microorganisms.

  In one embodiment, the volatile organic compound contained in the malodorous gas includes at least one of isopropyl alcohol, acetone, and butyl acetate.

  According to the wastewater treatment apparatus of this reference example, sludge containing at least one of isopropyl alcohol, acetone, and butyl acetate as a volatile organic compound contained in the malodorous gas is introduced into a high-concentration microorganism tank. Thus, the isopropyl alcohol, acetone, butyl acetate and the like can be easily decomposed by microorganisms.

According to wastewater treatment apparatus of the present invention, the waste water containing aminoethanol and dimethyl sulfoxide can be processed by the first waste water treatment unit, with a high concentration nitrogen wastewater can be processed by the second waste water treatment unit, the first The malodorous gas generated in the waste water treatment part can be efficiently treated in the second waste water treatment part. Therefore, according to the wastewater treatment device according to the present invention, on which can be combined with waste water treatment apparatus malodorous exclusion equipment, instead of using chemicals for treating malodorous gases, produced for example waste water treatment, etc. Uses sludge. Therefore, according to the present invention, water to be treated and malodorous gas can be treated efficiently, and initial cost and running cost can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 schematically shows a first embodiment of the wastewater treatment apparatus of the present invention. The first embodiment is a wastewater treatment device 28 as a first wastewater treatment unit that generates malodorous gas, and a second wastewater treatment unit as a second wastewater treatment unit that treats the malodorous gas generated by the first wastewater treatment device 28. Two waste water treatment devices 29.

  First, the first wastewater treatment device 28 that generates a bad odor will be described. The first waste water treatment device 28 includes a first denitrification tank 1 and a first nitrification tank 6.

  Drainage containing aminoethanol and dimethyl sulfoxide is introduced into the lower part of the first denitrification tank 1. In the first denitrification tank 1, the microorganism concentration is higher in the lower part than in the upper part due to gravity. Therefore, introduction of toxic aminoethanol-containing wastewater into the lower portion of the first denitrification tank 1 reduces the irritation for the microorganisms, so that the microorganism treatment is stabilized.

  The first denitrification tank 1 is introduced with biologically treated water or sludge generated by biological treatment. Trace elements such as phosphorus, potassium, calcium, and magnesium contained in the biologically treated water or sludge generated by the biological treatment contain all microorganisms in the first denitrification tank 1 and the first nitrification tank 6. Promotes activity. In particular, in the high-concentration microorganism treatment using the submerged membrane 7A disposed in the aerobic portion 24 at the upper part of the first nitrification tank 6, the treatment is not stable unless the trace element is contained in the water to be treated.

  The first denitrification tank 1 is provided with a stirrer 2 for stirring the inside of the tank. The agitator 2 may be an underwater agitator installed in water as long as it can efficiently mix wastewater containing anaerobic microorganisms, aminoethanol, and dimethyl sulfoxide. However, since the microorganism concentration in the first denitrification tank 1 is MLSS (Mixed Liquor Suspended Solid) and a high concentration of 10000 ppm, the stirrer 2 cannot be agitated in the first denitrification tank 1. Dead space. In order to cope with this, in this embodiment, circulation agitation by the air lift pump 3 is performed.

  That is, a large amount of return sludge containing microorganisms from the semi-anaerobic portion 23 in the lower part of the first nitrification tank 6 is introduced into the upper part of the first denitrification tank 1 by the air lift pump 3.

This air lift pump 3 is provided with a diffuser pipe 5A at the lower end of the vertical pipe 3A. The air diffuser 5 </ b> A is connected to the blower 16. Air generated from the blower 16 is discharged from the diffuser pipe 5A in the vertical pipe 3A, and the return sludge containing microorganisms moves from the lower part in the vertical pipe 3A to the upper part in the vertical pipe 3A by the upward flow.

  Next, the waste water containing aminoethanol and dimethyl sulfoxide introduced into the first denitrification tank 1 is anaerobically treated and then naturally flows from the upper part of the first denitrification tank 1 in the first nitrification tank 6. It is introduced into the lower semi-anaerobic part 23.

  In the first nitrification tank 6, the submerged membrane 7 is installed in the upper aerobic part 24, so that the microorganisms stay in the first nitrification tank 6 or are put into the first denitrification tank 1 by the air lift pump 3. It will be returned. The transfer of the returned sludge by the air lift pump 3 is a method using air, and a large amount of returned sludge can be transferred with less power. That is, the transfer system using the air lift pump 3 is an energy saving system. In general, a pump system such as a pressure pump using a mechanical driving force can secure a large lift, but requires more power than an air lift pump system, and does not become an energy saving system.

  The microbial sludge returned to the first denitrification tank 1 by the air lift pump 3 returns to the first nitrification tank 6 and circulates again. By circulating the microbial sludge in both tanks, the microbial concentration in both tanks is maintained at substantially the same concentration. As described above, circulating agitation using an air lift pump system is performed as a countermeasure against the occurrence of a dead space that cannot be agitated with a normal agitator or underwater agitator when the microorganism concentration is as high as 10,000 ppm or more. The microorganism concentration in both the first denitrification tank 1 and the first nitrification tank 6 is maintained at 10000 ppm or more with MLSS (mixed liquor suspended solid). The first denitrification tank 1 is provided with an oxidation-reduction potentiometer (not shown) for measuring the anaerobic degree.

  In the first denitrification tank 1, nitrate nitrogen introduced from the first nitrification tank 6 by the air lift pump 3 is converted into aminoethanol as an alternative to methanol, which is a general hydrogen donor, by anaerobic microorganisms. In the presence, it is reduced to nitrogen gas. This nitrate nitrogen is one in which aminoethanol is decomposed by microorganisms in the first nitrification tank 6 and changed to nitrate nitrogen. Further, in the first denitrification tank 1, organic substances other than aminoethanol are biologically decomposed by anaerobic microorganisms.

  Next, the to-be-processed water which flowed out from the inside of the 1st denitrification tank 1 is introduce | transduced into the semi-anaerobic part 23 of the lower part of the 1st nitrification tank 6. FIG. Here, the anaerobic part is a state in which there is no dissolved oxygen, the aerobic part is a state in which the dissolved oxygen is maintained at several ppm, and the semi-anaerobic part is 0 ppm of dissolved oxygen or dissolved oxygen. Even if it exists, it is defined as about 0.5 ppm.

  The first nitrification tank 6 is provided with a separation wall 4A on the side surface. The separation wall 4A is for separating the upper aerobic part 24 and the lower semi-anaerobic part 23 from each other. The separation wall 4A may be constructed of concrete or manufactured from steel. In other words, the material of the separation wall 4A is not limited, but when made of steel, it is necessary to firmly prevent the corrosion of the coating when used for a long time. Due to the installation of the separation wall 4A, a water flow is generated by the air discharged from the diffuser pipe 5B in the upper aerobic portion 24 of the first nitrification tank 6, but this water flow is somewhat less than the lower semi-anaerobic portion 23. Will affect, but more will not. Since the microorganism concentration in the first nitrification tank 6 is high, the influence of the aerobic part 24 on the semi-anaerobic part 23 is minimized even with the separation wall 4A having the size shown in FIG. be able to.

  In this embodiment, in the circulation system by the air lift pump 3 between the first denitrification tank 1 and the first nitrification tank 6, the semi-anaerobic portion 23 is provided at the lower part of the first nitrification tank 6. The anaerobic microorganisms that move to the first nitrification tank 6 together with the water to be treated treated with the anaerobic microorganisms in the denitrification tank 1 are introduced into the aerobic part 24 via the semi-anaerobic part 23. Thereby, compared with the case where the anaerobic microorganisms are introduced directly (straight) into the aerobic part 24, the environmental stress on the anaerobic microorganisms moving from the first denitrification tank 1 to the first nitrification tank 6 is reduced. Thus, the efficiency in treating nitrogen with microorganisms can be improved.

  In the first nitrification tank 6, microorganisms specific to the lower semi-anaerobic part 23 propagate, and the treated water is subjected to microbial treatment not only by anaerobic microorganisms and aerobic microorganisms but also by various microorganisms that propagate in the semi-anaerobic part 23. As a result, overall wastewater treatment efficiency is improved. Moreover, it discovered that the microorganisms which propagate in this semi-anaerobic part 23 are useful for the reduction | decrease of sludge by providing the semi-anaerobic part 23 in the lower part of the 1st nitrification tank 6. FIG. In this semi-anaerobic part 23, since aeration equipment is not installed, it is not aerated. However, due to the influence of some water flow in the upper aerobic part 24 being aerated, dissolved oxygen which is a condition of the semi-anaerobic part is Even if dissolved oxygen is present, it is about 0.5 ppm. Thereby, the semi-anaerobic part 23 can maintain the semi-anaerobic property.

  The air lift pump 3 has a vertical pipe 3A extending from the semi-anaerobic part 23 of the first nitrification tank 6 to the aerobic part 24, and when the air discharged from the diffuser pipe 5A rises in the vertical pipe 3A. Moreover, the return sludge from the semi-anaerobic portion 23 of the first nitrification tank 6 is also lifted and transferred at the same time. Although this air lift pump 3 can ensure only a relatively low head, the air lift pump 3 can transfer a large amount of returned sludge to the first denitrification tank 1 with less electric power than a pressure pump or the like. Thus, by transferring a large amount of return sludge to the first denitrification tank 1 by the air lift pump 3, this return sludge can also be used for stirring in the water tank of the first denitrification tank 1.

  In the aerobic portion 24, an air diffuser 5B for air-washing the submerged membrane 7A is installed below the submerged membrane 7A. The air supply to the air diffusing pipe 5B is performed by the discharge air from the blower 16. As the submerged membrane 7A, two types, a flat membrane type and a hollow fiber membrane, are commercially available.

  The treated water that has passed through the submerged membrane 7A naturally flows out by gravity from the gravity piping 9A connected to the submerged membrane 7A. That is, treated water comes out of the gravity pipe 9A due to a water head difference. Since the method based on the water head difference does not require electric power, energy saving operation is possible. In addition, when the submerged membrane 7A is blocked and the discharge amount from the gravity pipe 9A is reduced, the submerged membrane pump 8A connected to the submerged membrane 7A through the pipe is operated to secure treated water. it can. In addition, as an example of the utilization method of the submerged membrane 7A, the gravitational piping method and the submerged membrane pump method are simultaneously adopted for securing the treated water, and taking advantage of each of them to secure the treated water, It is more preferable from the viewpoint of safe driving. Further, when the amount of permeated water of the submerged membrane 7A decreases, that is, when the amount of treated water decreases, the submerged membrane 7A itself is washed with sodium hypochlorite or the like. The treated water derived from the first nitrification tank 6 via the gravity pipe 9A or the submerged membrane pump 8 becomes the first treated water.

  Next, the malodor generated in the first waste water treatment device 28 will be described. In the first denitrification tank 1 and the first nitrification tank 6 of the first waste water treatment device 28, dimethyl sulfoxide in the water to be treated is decomposed to generate a sulfur compound. The sulfur compound becomes malodorous gas 14 and is released from the upper part of the first denitrification tank 1 and the first nitrification tank 6. Therefore, the first wastewater treatment device 28 has a lid portion 28A, and surrounds and covers the entire wastewater treatment device 27 that generates a bad odor with the lid portion 28A, and an exhaust pipe L1 and an exhaust fan connected to the lid portion 28A. 10, the malodorous gas 14 is introduced into the scrubber 11.

  Microbial sludge is introduced into the upper part 11A of the scrubber 11 from the second nitrification tank 20 of the second wastewater treatment device 29 for treating malodor through the deodorized sludge outbound pipes 12A and 12B. Microbial sludge introduced into the upper part 11A of the scrubber 11 from the outgoing pipes 12A, 12B flows down in a spray manner toward the lower part 11B. At this time, the flowing microbial sludge is treated by contacting the malodorous gas introduced into the scrubber 11 with the exhaust fan 10 and gas-liquid (gas and liquid). Thus, the malodorous gas is processed by the scrubber 11 and is discharged as the processing gas 15 from the top of the scrubber 11.

  In the second waste water treatment device 29, high concentration nitrogen waste water is introduced into the lower part of the second denitrification tank 17. Examples of the high-concentration nitrogen wastewater include high-concentration ammonia wastewater generated in a semiconductor factory, development wastewater, and dimethylformamide wastewater. In this embodiment, compared with the upper part of the 2nd denitrification tank 17, since the high concentration nitrogen waste_water | drain is introduce | transduced into the lower part where the microorganism concentration is high concentration by gravity, the irritation | stimulation added to microorganisms decreases and it is suitable for microorganism processing. It is.

  The second denitrification tank 17 is introduced with biologically treated water or sludge generated by biological treatment. Since the biologically treated water or the sludge generated by the biological treatment contains trace elements such as phosphorus, potassium, calcium, and magnesium, the trace elements promote the activity of microorganisms in all the tanks. In particular, in the high-concentration microbial treatment using the submerged membrane 7B disposed in the aerobic portion 26 in the upper part of the second nitrification tank 20, the treatment can be stabilized because this trace element is contained in the water to be treated.

  The second denitrification tank 17 is provided with a stirrer 18 for stirring the inside of the tank. The agitator 18 may be an underwater agitator installed in water, instead of a normal agitator, as long as anaerobic microorganisms and high-concentration nitrogen wastewater can be mixed efficiently. However, since the microorganism concentration of the second denitrification tank 17 is as high as 10,000 ppm, a so-called dead space is created in the second denitrification tank 17 that cannot be stirred by the agitator 18 alone. In order to cope with this, circulation agitation by the air lift pump 19 is performed.

  The air lift pump 19 introduces a large amount of return sludge containing microorganisms from the semi-anaerobic portion 25 at the lower part of the second nitrification tank 20 into the upper part of the second denitrification tank 17. In the second wastewater treatment device 29 that treats this bad odor, the vertical pipe 19 </ b> A of the air lift pump 19 reaches the lower part of the second nitrification tank 20. A diffuser pipe 5C is installed at the lower end of the vertical pipe 19A, and the air generated from the blower 16 is discharged from the diffuser pipe 5C in the vertical pipe 19A. To the upper part of the pipe.

  The high-concentration nitrogen drainage introduced into the second denitrification tank 17 is anaerobically treated and then introduced from the upper part of the second denitrification tank 17 into the semi-anaerobic part 25 at the lower part of the second nitrification tank 20 by natural flow. Is done. In the second nitrification tank 20, the submerged membrane 7 </ b> B is installed in the upper aerobic portion 26, so that the microorganisms remain in the second nitrification tank 20 or are returned to the second denitrification tank 17 by the air lift pump 19. Is it? The transfer of the returned sludge by the air lift pump 19 is a method using air, and is an energy-saving pump that can transfer a large amount of returned sludge with relatively little power. In general, a pump system such as a pressure feed pump can secure a large lift, but requires more power than an air lift pump system and is not an energy saving system.

  The microbial sludge returned to the second denitrification tank 17 returns to the second nitrification tank 20 from the second denitrification tank 17 and circulates. By circulating the microbial sludge in both tanks, the microbial concentration in both tanks is maintained at substantially the same concentration. As described above, when the concentration of microorganisms is as high as 10,000 ppm or more, as a countermeasure against the occurrence of a dead space that cannot be stirred with a normal stirrer or underwater stirrer, circulating agitation is performed by an air lift pump system. The microorganism concentration in both tanks is maintained at 10000 ppm or more by MLSS (Mixed Liquor Suspended Solid). The second denitrification tank 17 is provided with an oxidation-reduction potentiometer (not shown) for measuring the degree of anaerobicity.

  In the second denitrification tank 17, nitrate nitrogen introduced from the second nitrification tank 20 is reduced to nitrogen gas by an anaerobic microorganism by an air lift pump 19. This nitrate nitrogen is one in which the high-concentration nitrogen wastewater is decomposed by microorganisms in the second nitrification tank 20 and converted to nitrate nitrogen. Moreover, in the 2nd denitrification tank 17, the organic substance in to-be-processed water is biologically decomposed | disassembled by the anaerobic microorganism.

  Next, the to-be-processed water which flowed out from the inside of the 2nd denitrification tank 17 is introduce | transduced into the semi-anaerobic part 25 of the lower part of the 2nd nitrification tank 20. FIG. Here, the anaerobic part is a state where there is no dissolved oxygen, the aerobic part is a state where the dissolved oxygen is maintained at several ppm, and the semi-anaerobic part is 0 ppm of dissolved oxygen or there is dissolved oxygen. However, it is defined as about 0.5 ppm.

  In the second nitrification tank 20, a separation wall 4 </ b> B for separating the upper aerobic part 26 and the lower semi-anaerobic part 25 is installed on the side surface of the second nitrification tank 20. The separation wall 4B may be constructed of concrete or made of steel. That is, the material of the separation wall 4B is not limited. However, when the separation wall 4B is made of steel, it needs to be well coated to prevent corrosion when used for a long period of time.

  In the second nitrification tank 20, a water flow is generated by the air discharged from the diffuser pipe 5D in the upper aerobic part 26, but the water flow is lower than the lower semi-anaerobic part 25 by installing the separation wall 4B. It can affect some but not more. In the second nitrification tank 20, the microorganism concentration is high, so that the influence of the aerobic part 26 on the semi-anaerobic part 25 is minimized even with the separation wall 4 </ b> B having a size as shown in FIG. 1. can do.

  Thus, in this embodiment, in the circulation system by the air lift pump 19 between the second denitrification tank 17 and the second nitrification tank 20, the semi-anaerobic portion 25 is provided at the lower part of the second nitrification tank 20. Thereby, the anaerobic microorganism which moves to the 2nd nitrification tank 20 with the to-be-processed water processed with the anaerobic microorganism in the 2nd denitrification tank 17 can be introduce | transduced into the aerobic part 26 through the semi-anaerobic part 25. FIG. Thereby, compared with the case where the said anaerobic microorganism is directly (straightly) introduced into the aerobic part 26, the environmental stress with respect to the moving anaerobic microorganism can be reduced, and the efficiency at the time of processing nitrogen is reduced. Can be improved. In addition, in the semi-anaerobic part 25, specific microorganisms propagate, and the water to be treated is treated not only by anaerobic microorganisms and aerobic microorganisms but also by various microorganisms that propagate in the semi-anaerobic part 25. Efficiency can be improved.

  Moreover, it discovered that the microorganisms which propagate in the semi-anaerobic part 25 help the sludge reduction | decrease by the semi-anaerobic part 25 existing in the lower part of the 2nd nitrification tank 20. FIG. In this semi-anaerobic part 25, aeration equipment is not installed and aeration is not performed, but the condition of the semi-anaerobic part is affected by some water flow from the aerobic part 26 in the upper part being aerated. The dissolved oxygen is 0 ppm or even if dissolved oxygen is present, it is about 0.5 ppm. Thereby, the semi-anaerobic property in the semi-anaerobic part 25 can be maintained.

  The second nitrification tank 20 is provided with a vertical pipe 19 </ b> A of an air lift pump 19 that spans the semi-anaerobic part 25 and the aerobic part 26. In the air lift pump 19, when the air discharged from the blower 16 rises inside the vertical pipe 19 </ b> A installed vertically, the return sludge is also lifted and transferred simultaneously. Although this air lift pump 19 can ensure only a relatively low head, a large amount of return sludge can be transferred to the second denitrification tank 17 with less electric power than the pressure pump. According to this air lift pump 19, a large amount of return sludge can be transferred to the second denitrification tank 17, which is useful for stirring in the water tank of the second denitrification tank 17.

  In the aerobic portion 26 of the second nitrification tank 20, an air diffuser 5D for air-washing the submerged membrane 7B is installed below the submerged membrane 7B. Air is supplied to the air diffusing pipe 5 </ b> D by air discharged from the blower 16. As the submerged membrane 7B, either one of a commercially available flat membrane type or hollow fiber membrane may be adopted.

  The treated water in the second nitrification tank 20 naturally flows out from the gravity pipe 9B connected to the submerged membrane 7B as the second treated water by gravity. That is, the second treated water from the gravity pipe 9B is derived by the water head difference. Since the method using gravity does not require electric power, energy saving operation is possible. Further, when the submerged membrane 7B is blocked and the discharge amount from the gravity pipe 9B is reduced, the treated water is secured by operating the submerged membrane pump 8B connected to the submerged membrane 7B by the pipe. it can.

  In addition, as a method of utilizing the submerged membrane 7B, the gravitational piping method and the submerged membrane pump method are adopted simultaneously for securing the second treated water, and the second treated water is secured by taking advantage of the respective advantages. It is more preferable to adopt the method from the viewpoint of safe driving. Further, when the amount of permeated water of the submerged membrane 7B decreases, that is, when the amount of treated water decreases, the submerged membrane 7B itself is washed with sodium hypochlorite or the like.

  Thus, the water to be treated from the second nitrification tank 20 is led out as the second treated water via the gravity pipe 9 or the submerged membrane pump 8.

  Next, the malodor treatment by the waste water treatment device 29 will be described. Microbial sludge present in the upper aerobic part 26 of the second nitrification tank 20 provided in the wastewater treatment device 29 adsorbs substances that cause malodors such as sulfur compounds, and after this adsorption, partial decomposition by microorganisms occurs. Is possible. Therefore, the microbial sludge in the aerobic part 26 is introduced from the waste water treatment device 28 by being introduced into the upper portion 11A of the scrubber 11 as the deodorized sludge through the sludge pump 22 by the sludge pump 22. A bad odor can be adsorbed and partially decomposed. That is, microbial sludge is sprayed from the upper portion 11A of the scrubber 11 and brought into contact with malodorous gas, so that malodorous components such as sulfur compounds are adsorbed by the microbial sludge and partially microbially decomposed. In this scrubber 11, the sludge after adsorbing the malodorous component and partially microbially decomposed is passed through the deodorizing sludge return pipe 13 connected to the lower part 11 B of the scrubber 11, and the upper part of the malodorous sludge introduction pipe 21. To be introduced. The introduction pipe 21 extends in the vertical direction from the upper part to the lower part of the second nitrification tank 20.

  Therefore, the sludge containing the malodorous component moves from the upper part of the introduction pipe 21 to the lower part of the introduction pipe 21, and is then introduced into the semi-anaerobic part 25, where most of the odor-causing substances are decomposed by microorganisms. . The microbial sludge after the malodor causing substance is decomposed again moves to the aerobic part 26 and is introduced into the upper part 11A of the scrubber 11 from the aerobic part 26 through the outbound pipe 12 of the deodorizing sludge by the sludge pump 22. Is done. That is, in this waste water treatment device 29, the microbial sludge in the second nitrification tank 20 passes through the deodorizing sludge outbound paths 12A and 12B and the return path 13, and the aerobic part 26 and the semi-anaerobic part 25 of the second nitrification tank 20 And the scrubber 11 are circulated. Due to the circulation of the deodorizing sludge, malodorous compounds such as sulfur contained in the malodorous gas generated in the waste water treatment device 28 are adsorbed by the deodorizing sludge, and the first stage partial decomposition in the scrubber 11 and the semi-anaerobic portion 25. And the second most decomposition performed by the microorganisms of the aerobic part 26.

(Second embodiment)
Next, FIG. 2 shows a second embodiment of the waste water treatment apparatus of the present invention. In the first embodiment shown in FIG. 1, the aerobic part 26 and the semi-anaerobic part 25 of the second nitrification tank 20 are not filled with the filler, whereas in the second embodiment, the second nitrification tank 20N. The aerobic part 26N and the semi-anaerobic part 25N are filled with a vinylidene chloride filler 27 as a filler. Therefore, in the second embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals, detailed description thereof will be omitted, and parts different from those of the first embodiment will be described.

  In the second embodiment, the aerobic part 26N and the semi-anaerobic part 25N of the second nitrification tank 20N of the waste water treatment device 29N as the second waste water treatment part are filled with the vinylidene chloride filling material 27. While improving the nitrogen treatment efficiency with respect to concentration nitrogen wastewater, most of malodorous compounds, such as sulfur, can be decomposed | disassembled efficiently.

  That is, since the aerobic part 26N and the semi-anaerobic part 25N of the second nitrification tank 20N are filled with the vinylidene chloride filler 27, compared with the case where there is no filler, the aerobic part 26N and the semi-anaerobic part 25N The microorganism concentration becomes high when the whole tank is averaged. In addition, since microorganisms adhere to the vinylidene chloride filler 27 and propagate therethrough, the microorganisms are more stabilized and the processing ability of nitrogen and malodorous components is improved as compared with the case where there is no filler. In addition, when this vinylidene chloride filling 27 is arrange | positioned to the whole water tank of the 2nd nitrification tank 20N, since microorganisms concentration becomes high concentration in the whole tank, it is preferable.

  In the second embodiment, in the wastewater treatment apparatus 29N, microorganisms propagate in the vinylidene chloride filling 27 with the passage of time from the trial operation. The microbial concentration on the surface of the vinylidene chloride filling 27 becomes 30000 ppm or more, which leads to an increase in the processing efficiency of nitrogen and malodorous components. The material of the vinylidene chloride filler 27 is vinylidene chloride which is strong and is not affected by chemical substances, and can be used semipermanently. As the vinylidene chloride filling 27, there are products such as biocode, ring lace, biomultileaf, biomodule, and the like, but they may be selected according to the properties of the waste water. In the aerobic part 26N of the second nitrification tank 20N, ammonia nitrogen in the water to be treated is oxidized and decomposed by aerobic microorganisms into nitrate nitrogen and nitrite nitrogen.

(Third embodiment)
Next, FIG. 3 shows a third embodiment of the waste water treatment apparatus of the present invention. In the first embodiment shown in FIG. 1, the first denitrification tank 1 and the first nitrification tank 6 of the wastewater treatment apparatus 28 and the second denitrification tank 17 and the second nitrification tank 20 of the wastewater treatment apparatus 29 are filled with a filler. Was not. In contrast, in the third embodiment, the first denitrification tank 1N and the first nitrification tank 6N of the waste water treatment apparatus 28N are filled with vinylidene chloride fillers 27A and 27B as fillers. In the third embodiment, the second denitrification tank 17N and the second nitrification tank 20N of the waste water treatment apparatus 29N are filled with vinylidene chloride fillers 27C and 27D as fillers. Therefore, in the third embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and portions different from those in the first embodiment are described.

  In the third embodiment, the first denitrification tank 1N and the first nitrification tank 6N of the wastewater treatment device 28N are filled with vinylidene chloride fillings 27A and 27B, and aminoethanol and dimethylsulfoxide in the wastewater containing aminoethanol and dimethylsulfoxide are filled. Increases decomposition and nitrogen treatment efficiency. In the third embodiment, the second denitrification tank 17N and the second nitrification tank 20N of the wastewater treatment apparatus 29N are filled with the vinylidene chloride fillers 27C and 27D to increase the nitrogen treatment efficiency in the high concentration nitrogen wastewater. .

  That is, the first denitrification tank 1N, the first nitrification tank 6N, the second denitrification tank 17N, and the second nitrification tank 20N are filled with the vinylidene chloride fillers 27A, 27B, 27C, and 27D. When the concentration is averaged over the entire tank, the concentration is higher than that in the state where there is no filling. In addition, microorganisms adhere to and propagate on the vinylidene chloride packings 27A to 27D, and the microorganisms are more stable than those without packing, and aminoethanol, dimethyl sulfoxide and nitrogen decomposition and nitrogen treatment ability are improved. . In order for the microbial concentration to be high in the entire tank, it is preferable to place the vinylidene chloride fillers 27A to 27D in the entire tank of each tank. The presence of the vinylidene chloride packings 27 </ b> A to 27 </ b> D increases the anaerobic degree (measured by the oxidation-reduction potential) and promotes the denitrification reaction as compared to the state without the packing. In the wastewater treatment apparatus of this embodiment, microorganisms propagate on the vinylidene chloride fillers 27A to 27D with the passage of time from the trial run. The microbial concentration on the surface of each of the vinylidene chloride packings 27A to 27D becomes 30000 ppm or more, and aminoethanol, dimethyl sulfoxide and nitrogen are decomposed and nitrogen treatment ability is improved.

  In addition, the material of the vinylidene chloride fillers 27A to 27D is vinylidene chloride that is strong and is not affected by chemical substances, and can be used semipermanently. The vinylidene chloride fillers 27A to 27D include products such as biocodes, ring laces, biomulti-leafs, biomodules, etc., and may be selected according to the properties of the waste water.

  In the first denitrification tank 1N and the second denitrification tank 17N, nitrate nitrogen in the treated water returned from the first nitrification tank 6N and the second nitrification tank 20N by the air lift pump 3 and the air lift pump 19 is reduced. Thus, nitrogen gas is processed and nitrogen is treated. In the first nitrification tank 6N and the second nitrification tank 20N, aminoethanol and ammonia nitrogen in the water to be treated are oxidized and decomposed by aerobic microorganisms to become nitrate nitrogen and nitrite nitrogen.

  In the first to third embodiments, the exhaust fan 10 introduces the malodorous gas 14 from the first wastewater treatment device 28 into the scrubber 11, but the exhaust gas containing volatile organic compounds outside the first wastewater treatment device 28 is used. Although the case where it does not introduce into the scrubber 11 was demonstrated, not only the malodorous gas 14 which the exhaust fan 10 generate | occur | produces in the 1st waste water treatment apparatus 28 but the gas containing a volatile organic compound may also be introduce | transduced into the scrubber 11. In this case, it becomes a modification of the first to third embodiments. In this variant, both gases are reasonably treated with microorganisms in the scrubber 11. In addition, in the process of the gas by microorganisms, the applicable range of the kind of gas which can be processed is wide, and the scrubber 11 can process many kinds of gas. Moreover, the gas containing a volatile organic compound may be a malodorous gas.

  Moreover, in the said 1st-3rd embodiment, although the deteriorating sludge outbound piping 12A and 12B for introducing the microorganism sludge of the aerobic part 26 into the scrubber 11 is provided, the deodorizing sludge outbound piping 12C is not provided. Although the case has been described, in this modified example, instead of the pipe 12B, a deodorizing sludge outbound pipe 12C indicated by a one-dot chain line provided with a micro / nano bubble generating tank 34 is provided. Therefore, in this modified example, the microbial sludge in the second nitrification tank 20 of the second waste water treatment device 29 for treating malodor is passed through the deodorizing sludge outbound pipe 12C by the sludge pump 22, and the micro / nano bubble generation tank. 34.

A micro / nano bubble generator 31 is installed in the micro / nano bubble generation tank 34, and air from the air suction pipe 33 is introduced into the micro / nano bubble generator 31 while being adjusted by a valve 32. Further, the sludge in the micro / nano bubble generation tank 34 is fed to the micro / nano bubble generator 31 from the water pipe 36 by the circulation pump 30 at a pressure of 1.5 kg / cm ² or more. Since most of the sludge is water, the micro / nano bubble generator 31 efficiently generates micro / nano bubbles. Therefore, in the micro / nano bubble generation tank 34, the sludge and the micro / nano bubbles are mixed, and microorganisms in the sludge are activated.

  Microbial sludge containing micro / nano bubbles generated in the micro / nano bubble generation tank 34 is sprinkled by the micro / nano bubble generation tank pump 35 through the deodorizing sludge forward piping 12A at the upper part 11A of the scrubber 11. Thereby, in the scrubber 11, the microbial sludge containing the micro-nano bubbles is sprinkled from the upper part 11A and is brought into contact with a gas containing a malodorous gas or a volatile organic compound, whereby a malodorous component such as a sulfur compound or a volatile organic compound is removed. Adsorbed with microbial sludge and partially microbially decomposed. Since the microorganisms in the microbial sludge are activated by the micro / nano bubbles, the efficiency of gas treatment in the scrubber 11 is improved.

  In this scrubber 11, the sludge after adsorbing malodorous components and volatile organic compounds and partially decomposing the microorganisms passes through the deodorizing sludge return pipe 13 connected to the lower part 11 B of the scrubber 11, It is introduced into the upper part of the introduction pipe 21. The introduction pipe 21 extends in the vertical direction from the upper part to the lower part of the second nitrification tank 20.

  Therefore, the sludge containing the malodorous component and the volatile organic compound moves from the upper part of the introduction pipe 21 to the lower part of the introduction pipe 21 and is then introduced into the semi-anaerobic part 25 to cause the odor causing substance and volatile by microorganisms. Most of the organic compounds are decomposed. Microbial sludge after decomposition of the odor-causing substances and volatile organic compounds is moved again to the aerobic part 26, and the sludge pump 22 generates micro-nano bubbles from the aerobic part 26 to the deodorized sludge forward piping 12C. It is introduced into the upper part 11 </ b> A of the scrubber 11 through the tank 34. That is, in the wastewater treatment device 29, the microbial sludge in the second nitrification tank 20 is aerobic in the second nitrification tank 20 via the deodorizing sludge outbound paths 12A and 12C, the micro / nano bubble generation tank 34, and the return pipe 13. It will circulate between the part 26, the semi-anaerobic part 25, and the scrubber 11. FIG. By the circulation of the deodorizing sludge, malodorous compounds such as sulfur contained in the malodorous gas generated in the waste water treatment device 28 and volatile organic compounds contained in the exhaust gas containing volatile organic compounds are adsorbed by the deodorizing sludge. And it is processed by the partial decomposition | disassembly of the 1st step | paragraph in the scrubber 11, and most decomposition | disassembly of the 2nd step | paragraph implemented by the microorganisms activated by the sludge containing a micro nano bubble in the semi-aerobic part 25 and the aerobic part 26. The Rukoto.

  In the above variation, examples of the volatile organic compound contained in the volatile organic compound-containing exhaust gas include isopropyl alcohol, acetone, butyl acetate, and the like. Of course, as the volatile organic compound, any of the so-called volatile organic compounds (VOC (Volatile Organic Compounds)) is applicable.

(Experimental example)
An experimental apparatus having the same configuration as that of the second embodiment shown in FIG. 2 was manufactured. In this experimental apparatus, the capacity of the first denitrification tank 1 is 100 liters, the capacity of the first nitrification tank 6 is 200 liters, the capacity of the second denitrification tank 17 is 100 liters, and the capacity of the second nitrification tank 20N is 200 liters. is there.

  Moreover, the treated water with an aminoethanol concentration of 2760 ppm and a dimethylsulfoxide concentration of 130 ppm was collected as the wastewater containing aminoethanol and dimethylsulfoxide discharged from the production apparatus of the factory. Then, after the microbial training for about two months in this experimental apparatus was completed, the water to be treated was continuously introduced into the first denitrification tank 1 at a microorganism concentration of 17700 ppm. One month later, after waiting for the water quality to stabilize, the aminoethanol concentration of the first treated water was measured to be 120 ppm, and the dimethyl sulfoxide concentration was measured to be 8 ppm. Further, the odor gas generated from the waste water treatment device 28 (the first denitrification tank 1 and the first nitrification tank 6) that generates malodor (the level at which a person feels odor when the person approaches the experimental apparatus within 1 m) is scrubber 11. In the exhaust gas 15 after being treated with the above, there was almost no odor.

  In the time chart of FIG. 4A, in the first to third embodiments, the dimethyl sulfoxide concentration of the wastewater introduced into the first denitrification tank is about 80 ppm, and the nitrogen concentration of the wastewater introduced into the second denitrification tank is The residence time of each tank in the case of about 3000 ppm is shown. Further, in the time chart of FIG. 4B, in the first to third embodiments, the dimethyl sulfoxide concentration of the wastewater introduced into the first denitrification tank is about 160 ppm, and the nitrogen concentration of the wastewater introduced into the second denitrification tank is The residence time of each tank in the case of about 3000 ppm is shown.

It is a figure which shows typically 1st Embodiment of the waste water treatment equipment of this invention, and its modification. It is a figure which shows typically 2nd Embodiment of the waste water treatment equipment of this invention, and its modification. It is a figure which shows typically 3rd Embodiment of the waste water treatment equipment of this invention, and its modification. It is a time chart of each tank in the said 1st-3rd embodiment in case a dimethylsulfoxide density | concentration is about 80 ppm and a nitrogen concentration is about 3000 ppm. It is a time chart of each tank in the said 1st-3rd embodiment in case the dimethyl sulfoxide density | concentration of waste water is 160 ppm and nitrogen concentration is about 3000 ppm.

DESCRIPTION OF SYMBOLS 1 1st denitrification tank 2 Stirrer 3 Air lift pump 4A, 4B Separation wall 5A-5D Aeration pipe 6, 6N 1st nitrification tank 7A, 7B Submerged film 8A, 8B Submerged film pump 9A, 9B Gravity piping 10 Exhaust fan DESCRIPTION OF SYMBOLS 11 Scrubber 12A, 12B, 12C Outward piping of deodorizing sludge 13 Return piping of deodorizing sludge 14 Odor gas 15 Process gas 16 Blower 17, 17N 2nd denitrification tank 18 Stirrer 19 Air lift pump 20, 20N 1st nitrification tank 21 Odor-containing sludge introduction pipe 22 Sludge pump 23 Semi-anaerobic part 24 Aerobic part 25 Semi-anaerobic part 26 Aerobic part 27 Vinylidene chloride filling 28, 28N Waste water treatment apparatus 29, 29N generating bad odor 30 Circulation pump 31 Micro-nano bubble generator 32 Valve 33 Air suction pipe 34 Micro-nano bar Bull generation tank 35 Micro / nano bubble generation tank pump

Claims (1)

A first wastewater treatment unit that performs the first wastewater treatment and generates malodorous gas;
A second wastewater treatment unit that performs a second wastewater treatment and decomposes malodorous gas generated by the first wastewater treatment unit,
The first waste water treatment section is
A first denitrification tank into which a wastewater containing aminoethanol and dimethyl sulfoxide is introduced;
A first nitrification tank having a semi-anaerobic part,
The second wastewater treatment section is
A second denitrification tank into which nitrogen drainage is introduced;
A second nitrification tank having a semi-anaerobic part;
A scrubber into which malodorous gas from the first wastewater treatment section is introduced;
A first sludge introduction section for introducing sludge from the second nitrification tank to the scrubber;
A wastewater treatment apparatus, comprising: a second sludge introduction section for introducing the sludge from the scrubber into the second nitrification tank.

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