WO2006095510A1 - 排ガス排水処理装置および排ガス排水処理方法 - Google Patents
排ガス排水処理装置および排ガス排水処理方法 Download PDFInfo
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- WO2006095510A1 WO2006095510A1 PCT/JP2006/301552 JP2006301552W WO2006095510A1 WO 2006095510 A1 WO2006095510 A1 WO 2006095510A1 JP 2006301552 W JP2006301552 W JP 2006301552W WO 2006095510 A1 WO2006095510 A1 WO 2006095510A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/08—Prevention of membrane fouling or of concentration polarisation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2315/00—Details relating to the membrane module operation
- B01D2315/06—Submerged-type; Immersion type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
- B01D2321/185—Aeration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the present invention relates to an exhaust gas wastewater treatment apparatus and an exhaust gas wastewater treatment method.
- This invention responds to the regulation of the total amount of nitrogen by partial revision of the Water Pollution Control Law, which was also enforced in April 2004, and the PRTR Law (Environmental Pollutant Emissions, Migration Registration) enforced in April 2001.
- high-concentration nitrogen wastewater such as wastewater containing high-concentration ammonia
- aminoethanol-containing wastewater which are also drained mainly by semiconductor factories, can be treated efficiently, while at the same time reducing initial costs, running costs, and maintenance costs.
- the present invention relates to an exhaust gas wastewater treatment apparatus and an exhaust gas wastewater treatment method.
- high-concentration nitrogen wastewater specifically, high-concentration nitrogen wastewater such as wastewater containing about 3000 ppm of high-concentration ammonia has high biotoxicity, and therefore generally cannot be treated with microorganisms. I got it. In other words, in cases where nitrogen-containing wastewater was treated with microorganisms, treatment with ammonia concentrations as low as several hundred ppm was common.
- wastewater containing high-concentration ammonia of 3000 ppm or more was concentrated to about 1/10 using a vapor can as a physical method, and the concentrated solution was disposed as industrial waste.
- the concentrate corresponds to industrial waste.
- problems such as air pollution due to the use of fuel such as heavy oil are caused by the increase in industrial waste from business establishments and the disposal of concentrated liquid as industrial waste is generally incineration. there were.
- the processing method using the evaporator has a problem that the initial cost, running cost, and maintenance cost are high because a large amount of energy is consumed and a large plant facility is used.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-308900 discloses a biological treatment method. According to this biological treatment method of the prior art, the treatment efficiency with nitrite nitrogen generated when treating wastewater containing high concentrations of ammonia nitrogen. It is possible to prevent the decrease and perform stable processing. Specifically, this biological treatment method removes nitrite nitrogen from wastewater by reducing it to nitrogen gas by a biological denitrification method using autotrophic bacteria resistant to nitrite nitrogen.
- This ammonia-containing wastewater treatment method is disclosed in a nitrification tank, a denitrification tank, an ultraviolet oxidation tank, a nitrification tank, a photocatalytic ultraviolet oxidation tank, a denitrification tank, and an ultraviolet oxidation tank.
- Patent Document 2 Patent No. 3467671 describes another biological treatment method as another prior art!
- the organic wastewater in the raw water tank is sequentially fed to the denitrification tank and the nitrification tank by a liquid feed pump and is circulated between the two tanks.
- Nitrogen is removed by reducing it to nitrogen gas using biological nitrification and denitrification reactions, and sludge and treatment using a suction membrane pump immersed in the waste water in the nitrification tank. This is a nitrification denitrification method that separates water.
- the organic wastewater fed from the denitrification tank to the nitrification tank is made by branching a conduit sent from the denitrification tank to the nitrification tank in the middle and opening the tip of the branching section in the denitrification tank. A part of the water is blown into the organic waste water in the denitrification tank.
- the waste water is sent to the denitrification tank and the nitrification tank one after another by a feed pump and circulated between both tanks.
- Patent Document 3 Patent No. 3095620 describes another biological treatment method as a conventional technique.
- a denitrification tank into which raw water containing organic matter flows a nitrification tank into which a denitrification tank mixed solution of this denitrification tank flows, and a nitrification liquid that circulates the nitrification liquid in this nitrification tank to the above denitrification tank
- the treatment is carried out by a biological nitrogen removing apparatus including a circulation channel and a nitrification tank aeration apparatus disposed in the nitrification tank.
- a denitrifying bacteria-fixed ⁇ carrier filling zone for capturing and removing suspended substances in the raw water flowing into the denitrifying tank is provided in the denitrifying tank.
- the raw water introduction flow path and the nitrification liquid circulation flow path are communicated with the lower position of the denitrifying bacteria immobilization support filling zone of the denitrification tank, and suspended substances trapped and removed at the bottom of the denitrification tank in the denitrification bacteria immobilization support filling zone are removed.
- a sludge hopper for depositing is provided, and a hopper is installed in the sludge hopper.
- a diffuser is provided.
- wastewater containing ammonia at a high concentration of about 3000 ppm has a high biotoxicity, and generally has not been treated with microorganisms.
- high-concentration ammonia wastewater that cannot be treated with microorganisms because of its high biotoxicity was treated by incineration or concentration.
- the concentration method has a problem of large consumption of energy, an increase in industrial waste due to the concentrated liquid, and drought.
- Patent Document 4 Japanese Patent Laid-Open No. 2004-121962
- Patent Document 5 Japanese Patent Laid-Open No. 2003-334548 describes a method for generating nanobubbles.
- an object of the present invention is to provide an exhaust gas wastewater treatment method and an exhaust gas wastewater treatment apparatus capable of realizing improvement in treatment efficiency and reduction in treatment costs.
- the exhaust gas wastewater treatment method of the present invention uses micro / nano bubble water containing micro / nano bubbles as wash water for treating exhaust gas, and uses the wash water treated for the exhaust gas as waste water. It is characterized by being reused for processing.
- the exhaust gas wastewater treatment method of the present invention exhaust gas is treated using micro / nano bubble water as washing water, and therefore the exhaust gas can be efficiently washed by the high-speed washing function of the object surface having the micro / nano bubble force S.
- the micro-nano bubbles contained in the washing water can be used for wastewater treatment, and wastewater treatment efficiency can be improved.
- the micro-nano bubbles are (1) interfacial activity and sterilization, (2) dirt component adsorption function, (3) object surface high-speed cleaning function, (4) sterilization function, (5) catalytic action, function (6) Has functions and functions that increase the activity of microorganisms.
- the treatment efficiency of exhaust gas and wastewater can be improved, and the treatment cost can be reduced.
- Microbubbles are fine bubbles with a diameter of 50 microns (m) or less, shrink in water, and eventually disappear (completely dissolve).
- a nanobubble is a bubble that is smaller than a microbubble and has a diameter of several lOOnm or less (for example, a diameter of 100 to 200 nm) and can be present in water. It has been broken.
- the micro / nano bubble is a bubble in which the micro bubble and the nano bubble are mixed.
- the waste water treatment apparatus of one embodiment includes a micro-nano bubble water production unit that produces micro-nano bubble water containing micro-nano bubbles,
- An exhaust gas treatment unit for treating exhaust gas using the micro-nano bubble water produced by the micro-nano bubble water production unit for treating exhaust gas using the micro-nano bubble water produced by the micro-nano bubble water production unit
- the exhaust gas wastewater treatment apparatus of this embodiment since the micronano bubble water produced by the micro / nano bubble water preparation unit is used as the washing water, the exhaust gas is treated, so that the object surface of the micro / nano bubble has a high-speed cleaning function.
- the exhaust gas can be washed efficiently.
- the micro / nano bubbles contained in this washing water can be used for wastewater treatment, and the wastewater treatment efficiency can be improved.
- the treatment efficiency of exhaust gas and waste water can be improved, and the processing cost can be reduced.
- the micro-nano bubble water is produced using the treated water treated by the waste water treatment section as raw water, the running cost for exhaust gas treatment can be reduced.
- the wastewater treatment unit has a submerged membrane
- the micro-nanobubble water preparation unit uses treated water obtained from the submerged membrane of the wastewater treatment unit.
- the micro / nano bubble water is prepared as raw water.
- the micro / nano bubble water production unit produces the micro / nano bubble water using the treated water obtained from the submerged membrane of the waste water treatment unit as raw water. Since the treated water contains a large amount of electrolyte, micro-nano bubbles can be produced efficiently.
- the waste water treatment unit includes a conditioning tank, a denitrification tank, and a nitrification tank having a submerged film.
- the micro-nano bubble water preparation part is a micro-nano bubble reaction tank including a micro-nano bubble generator,
- the exhaust gas treatment unit is a water scrubber.
- the exhaust gas treatment part is a water scrubber
- an exhaust gas treatment system can be constructed relatively easily.
- the micro / nano bubble reaction tank produces micro / nano bubble water using the treated water obtained from the submerged membrane of the nitrification tank of the waste water treatment unit as raw water, and the micro / nano bubble from the micro / nano bubble reaction tank. Water is used as washing water for the water scrubber. Therefore, the wastewater treated water introduced into the wastewater treatment section is used to clean the water scrubber as the exhaust gas treatment section It can be effectively recycled as water.
- nitrogen wastewater is introduced into the adjustment tank of the wastewater treatment unit
- It has a waste water introduction part that introduces the wash water treated with the exhaust gas in the exhaust gas treatment part into the adjustment tank of the waste water treatment part.
- the exhaust gas wastewater treatment device of this embodiment in the adjustment tank of the wastewater treatment unit, high concentration nitrogen wastewater can be pretreated by the micro / nano bubbles contained in the wastewater of the exhaust gas treatment unit.
- the micro / nano bubbles can be recycled in the waste water treatment section.
- the waste water introduced into the adjustment tank in addition to the exhaust gas treatment unit becomes waste water containing micro-nano bubbles.
- Mixing high-concentration nitrogen wastewater and wastewater containing micro-nano bubbles in the adjustment tank enables acid pretreatment with micro-nano bubbles.
- pre-processing in this adjustment tank it is possible to reduce the size of the entire apparatus, particularly the nitrification tank, leading to a reduction in initial cost.
- the micro-nano bubble treatment (for example, ammonia nitrogen is partially oxidized to nitrate nitrogen) can be performed in the adjustment tank before the waste water is subjected to microbial treatment in the denitrification tank and nitrification tank.
- the exhaust gas treatment unit treats exhaust gas containing a nitrogen compound.
- the nitrogen contained in the exhaust gas can be efficiently transferred to the cleaning water by the high-speed cleaning function of the micro / nano bubbles.
- the exhaust gas is an exhaust gas containing aminoethanol.
- the exhaust gas treatment unit uses the washing water containing the micro-nano bubbles to remove aminoethanol contained in the exhaust gas in accordance with the principle of gas-liquid contact.
- the exhaust gas can be treated by efficiently shifting from the water to the washing water side.
- the exhaust gas treatment unit includes:
- a circulation part for circulating the wash water is provided at the upper part of the lower force.
- the exhaust gas treatment unit cleans the exhaust gas with the two types of micro / nano bubble-containing water, that is, the wash water and the circulating water in which the wash water is circulated.
- the performance of exhaust gas treatment can be improved.
- the nitrification tank has a micro / nano bubble generator for generating micro / nano bubbles for cleaning the submerged membrane.
- the submerged membrane in the nitrification tank is washed with the micro / nano bubbles generated by the micro / nano bubble generator, so that the submerged membrane can be reliably washed, and the submerged membrane The amount of treated water can be increased.
- the nitrification tank has an air diffuser for discharging air for cleaning the submerged film.
- the submerged film of the nitrification tank is washed with both the air discharged from the air diffuser and the micro / nano bubbles generated by the micro / nano bubble generator. Therefore, the submerged membrane can be cleaned more efficiently by combining two types of bubbles.
- the exhaust gas is an exhaust gas containing a volatile organic compound.
- the cleaning water is micro-nano bubble water, cleaning is reliably performed even for volatile organic compounds such as acetone contained in the exhaust gas.
- the exhaust gas is an exhaust gas containing a volatile organic compound.
- the cleaning water is micro / nano bubble water, cleaning is reliably performed even for volatile organic compounds such as acetone contained in the exhaust gas.
- exhaust gas waste water treatment method of the present invention exhaust gas is treated using micro / nano bubble water as cleaning water, and therefore, exhaust gas can be efficiently cleaned by the high-speed cleaning function of the object surface having micro / nano bubble force S. Moreover, by using the washing water treated with the exhaust gas for wastewater treatment, the micro / nano bubbles contained in the washing water can be used for wastewater treatment, and the wastewater treatment efficiency can be improved. Therefore, according to the exhaust gas wastewater treatment method of the present invention, it is possible to improve the treatment efficiency of exhaust gas and wastewater and reduce the treatment cost.
- FIG. 1 is a diagram schematically showing a first embodiment of a waste water treatment apparatus of the present invention.
- FIG. 2 is a diagram schematically showing a second embodiment of the waste water treatment apparatus of the present invention.
- FIG. 3 is a diagram schematically showing a third embodiment of the waste water treatment apparatus of the present invention.
- FIG. 4 is a diagram schematically showing a fourth embodiment of the waste water treatment apparatus of the present invention.
- FIG. 5 is a diagram schematically showing a fifth embodiment of the waste water treatment apparatus of the present invention.
- FIG. 6A is an example of a timing chart when the nitrogen concentration of the nitrogen waste water in the first to fifth embodiments is 2000 ppm.
- FIG. 6B is an example of a timing chart when the nitrogen concentration of the nitrogen waste water in the first to fifth embodiments is 4000 ppm.
- FIG. 1 schematically shows a first embodiment of the exhaust gas waste water treatment apparatus of the present invention.
- the first embodiment includes a conditioning tank 1, a denitrification tank 3, a nitrification tank 11 having a submerged film 16, a micro / nano bubble reaction tank 31 as a micro / nano bubble water production unit, and a scrubber as an exhaust gas treatment unit. Eighteen.
- High-concentration nitrogen wastewater is introduced into the adjustment tank 1, and wastewater containing aminoethanol as a volatile organic compound from the scrubber 18 overflows through the pipe L1 as a wastewater introduction part. Introduced by In this adjustment tank 1, the volume and quality of the wastewater introduced are adjusted.
- An example of high-concentration nitrogen wastewater introduced into this adjustment tank 1 is high-concentration nitrogen wastewater from a semiconductor factory, and this high-concentration nitrogen wastewater is a CMP (chemical mechanical power polishing) process from a semiconductor plant.
- the aminoethanol-containing wastewater from the scrubber 18 serving as the exhaust gas treatment unit is introduced into the adjustment tank 1, this aminoethanol is used as a hydrogen donor in the denitrification tank 3 subsequent to the adjustment tank 1. it can. This saves chemical costs compared to using methanol as the hydrogen donor in the denitrification tank 3.
- micro-nano bubbles exist in this aminoethanol-containing wastewater. Therefore, this micro-nanobubble partially removes ammonia in high-concentration ammonia-containing wastewater that is high-concentration nitrogen wastewater. Oxidize.
- the treated water from the adjustment tank 1 is introduced into the lower part 8 of the denitrification tank 3 via the pipe 39 by the adjustment tank pump 2.
- biological treatment water or sludge generated after biological treatment is introduced into the upper part 9 of the denitrification tank 3! Promote the activity of all microorganisms in the denitrification tank 3 and nitrification tank 11 by trace elements such as phosphorus, potassium, calcium, magnesium contained in this biologically treated water or sludge generated after biological treatment. Can do.
- the treated submerged membrane 16 is used to treat the treated water with a high concentration of microorganisms, so that the above-mentioned trace elements are contained in the treated water to increase the activity of microorganisms.
- the treatment with microorganisms can be stabilized and enhanced.
- Micro-nano bubbles are also active in microorganisms. Increase sex.
- the water to be treated from the adjustment tank 1 is supplied to the denitrification tank 3 by the adjustment tank pump 2.
- the stimulation of the water to be treated on the microorganisms in the denitrification tank 3 can be suppressed.
- treatment with microorganisms can be stabilized and enhanced.
- a separation wall 4 A that forms a boundary between the upper part 9 and the lower part 8 is installed on the inner wall. Further, the denitrification tank 3 is provided with a partition plate 6 extending in the vertical direction at the approximate center in the horizontal direction in the tank. A diffuser tube 5 is disposed between the partition plate 6 and the separation wall 4A. The diffuser 5 is connected to a denitrification tank blower 7. In the denitrification tank 3, an air lift effect can be generated by the combination of the partition plate 6 and the diffuser pipe 5. That is, a water flow along the partition plate 6 is generated by air bubbles discharged from the air diffuser pipe 5. That is, in this denitrification tank 3, in FIG.
- the denitrification tank blower 7 is based on intermittent operation in which a desired setting is made by a timer or the like.
- the lower part 8 of the denitrification tank 3 is connected to the lower hopper part 26 via the return pipe L10 and the return sludge pump 10 connected to the lower hopper part 26 of the semi-anaerobic part 13 of the nitrification tank 11.
- This return pipe L10 and return The return part constituted by the sludge pump 10 can move the semi-anaerobic sludge in the semi-anaerobic part 13 at the bottom of the nitrification tank 11 to the lower part 8 of the denitrification tank 3 without being completely exposed to oxygen in the air.
- the high-concentration nitrogen wastewater introduced into the denitrification tank 3 is treated anaerobically in the lower part 8 using aminoethanol in the aminoethanol-containing wastewater as a hydrogen donor, and then into the upper part 9 of the denitrification tank 3. It flows and is introduced into the semi-anaerobic part 13 at the lower part of the nitrification tank 11 by natural flow from the upper part 9.
- This nitrification tank 11 has an upper aerobic part 12 and a lower semi-anaerobic part 13.
- the nitrification tank 11 has a separation wall 4B attached to the inner wall of the tank. This separation wall 4B forms a boundary between the aerobic part 12 and the semi-anaerobic part 13.
- a submerged membrane 17 is disposed in the aerobic portion 12.
- the nitrification tank 11 has a partition plate 14 extending in the vertical direction at the central portion in the horizontal direction in the tank. The partition plate 14 exists over substantially the upper half in the vertical direction.
- a submerged film 16 is installed in the area on the right side of the cutting plate 14.
- the submerged membrane 16 is connected to a gravity pipe 17 for deriving treated water.
- An air diffuser 15A is disposed between the submerged membrane 16 and the partition plate 14, and the air diffuser 15A is connected to the nitrification tank blower 30.
- the combination of the air diffuser 15A and the partition plate 14 produces an air lift effect, and a water flow along the partition plate 14 is generated by the air discharged from the air diffuser 15A. That is, in this nitrification tank 11, in FIG. 1, an ascending water flow W11 occurs in the area on the right side of the partition plate 6, and a descending water flow W12 occurs in the area on the left side of the partition plate 6.
- the agitation in the tank can be performed.
- the submerged membrane 16 is installed, so that the microbes in the treated water stay in the nitrification tank 11 and are returned to the lower part 8 of the denitrification tank 3 by the return sludge pump 10 described above. Is it sent? The return sludge is transferred to the lower part 8 of the denitrification tank 3 by this return sludge pump 10 using a normal pump, and a large amount of return sludge can be transferred without being exposed to air. Anaerobic can be reliably maintained.
- the treated water flows out from the submerged membrane 16 through the gravity pipe 17, while the micro / nano bubbles in the micro / nano bubble reaction tank 31 pass through the water feed pump 22 and the water feed pipe 33.
- Water is sent to generator 32.
- the submerged membrane 16 is connected to a water pump 23 and a water feeding pipe 25, and the water pump 23 and the water feeding pipe 25 are connected to a micro-nano bubble generator 27 disposed below the submerged membrane 16. Yes. Therefore, the treated water from the submerged membrane 16 is introduced into the micro / nano bubble generator 27 through the water pump 23 and the water pipe 25.
- the micro-nano bubble generator 27 is connected to an air suction / intake pipe 24, and air is supplied from the air intake / intake pipe 24.
- the microbial sludge returned to the lower part 8 of the denitrification tank 3 from the lower hopper part 26 of the semi-anaerobic part 13 by the return sludge pump 10 passes through the upper part 9 of the denitrification tank 3 and is again returned to the nitrification tank 11 Return to the semi-anaerobic part 13 and circulate.
- the microbial concentration in both tanks is maintained at approximately the same level.
- ML SS Mated Liquor Suspended Solid
- a dead space that cannot be stirred is generated by stirring with a normal stirrer, submerged stirrer, and circulation pump.
- a combination of the partition plate 14 and the air diffuser 15A generates a water flow along the partition plate 14 and performs stirring in the entire tank by an air lift method. It is impossible to prevent the occurrence of dead space.
- the aerobic part 12 has a stirring force S smoother. Is progressing.
- Semi-anaerobic part 13 requires a certain amount of agitation, but semi-anaerobic part 13 is settled by natural sedimentation and concentrates microorganisms to a high concentration, so it is better to have less agitation than aerobic part 12. .
- the microorganism concentration in both the denitrification tank 3 and the nitrification tank 11 is maintained at lOOOOppm or more by MLSS (Mixed Liquor Suspended Solid).
- a submerged membrane cover 28 as a guide is attached to the submerged membrane 16.
- the micro / nano bubbles generated from the micro / nano bubble generator 27 gather and rise upward, so that the submerged membrane 16 can be washed efficiently.
- an air diffuser 15B is disposed below the micro-nano bubble generator 27. This air diffuser 15 B is connected to a nitrification tank blower 30.
- the air diffuser 15B is provided with an air diffuser cover 29 as a guide.
- the air diffuser cover 29 is provided with an upper micro / nano bubble generator 27 for supplying the air supplied from the nitrification tank blower 30 and discharged from the air diffuser 15B.
- the cleaning effect of the submerged membrane 16 can be further enhanced by efficiently applying it to the submerged membrane 16 via.
- the operation of the micro / nano bubble generator 27 for cleaning the submerged membrane 16 and the operation of the nitrification tank blower 30 may be performed separately or independently. Also good. If both are operated simultaneously, the cleaning effect is further enhanced by both the bubbles from the air diffuser 15B and the micro / nano bubbles generated by the micro / nano bubble generator 27. Since V and deviation are selected, it can be determined by looking at the state of the submerged film 16.
- the denitrification tank 3 is provided with an oxidation-reduction potentiometer (not shown) in order to measure the degree of anaerobicity.
- nitrate nitrogen in the treated water introduced from the semi-anaerobic part 13 of the nitrification tank 11 by the return sludge pump 10 is converted into nitrogen gas by anaerobic microorganisms in the presence of aminoethanol as a hydrogen donor. Reduced to.
- the nitrate nitrogen in the treated water is decomposed by microorganisms and converted to nitrate nitrogen in the aerobic portion 12 of the high-concentration ammonia wastewater or aminoethanol power nitrification tank 11 as high-concentration nitrogen wastewater.
- the denitrification tank 3 organic substances other than aminoethanol are biologically decomposed by anaerobic microorganisms.
- the treated water flowing out from the upper part 9 of the denitrification tank 3 is introduced into the semi-anaerobic part 13 which is the lower part of the nitrification tank 11 as described above.
- 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
- the semi-anaerobic part is a state in which the dissolved oxygen has Oppm power and dissolved oxygen. Even if it exists, it is defined as about 0.5 ppm.
- the lower semi-anaerobic condition in the nitrification tank 11 is provided in the circulation system including the return sludge pump 10 and the return sludge pipe L10 installed between the denitrification tank 3 and the nitrification tank 11, the lower semi-anaerobic condition in the nitrification tank 11 is provided. Part 13 was provided. Therefore, the anaerobic microorganisms moving to the nitrification tank 11 together with the treated water treated with anaerobic microorganisms in the denitrification tank 3 are not directly introduced directly into the aerobic part 12, but through the semi-anaerobic part 13. Introduced to aerobic section 12. Thereby, the environmental stress with respect to the anaerobic microorganisms which move to the nitrification tank 11 can be reduced. Those who have less environmental stress on the anaerobic microorganisms can improve the treatment efficiency when treating nitrogen.
- microorganisms specific to the semi-anaerobic part 13 propagate, and the treated water is treated not only by anaerobic microorganisms and aerobic microorganisms but also by various microorganisms that propagate in the semi-anaerobic part 13.
- the efficiency of microbial treatment can be improved comprehensively.
- the microorganisms that propagate in the semi-anaerobic part 13 are useful for sludge reduction (volume reduction).
- the semi-anaerobic part 13 is provided with an aeration pipe as an aeration facility, so it is aerated, but it is aerated, and the influence of some water flow in the upper aerobic part 12 is affected.
- the dissolved oxygen which is a semi-anaerobic condition, has Oppm power, and even if dissolved oxygen is present, it is about 0.5 ppm.
- the semi-anaerobic part 13 maintains the semi-anaerobic property.
- An aeration tube 15B for cleaning the submerged membrane 16 and a micro / nano bubble generator 27 are installed in the semi-anaerobic section 13, but the amount of micro / nano bubbles and the amount of air discharged from the aeration tube 15 are adjusted. And what is necessary is just to maintain a semi-anaerobic state. As a result, even in a semi-anaerobic state, it is possible to achieve a semi-anaerobic state with a high dissolved oxygen concentration.
- the submerged membrane 16 two types, a flat membrane type and a hollow fiber membrane, are commercially available. The treated water that has passed through the submerged membrane 16 naturally flows out of the gravity pipe 17 connected to the submerged membrane 16 by gravity.
- the gravity pipe 17 uses a water head difference to discharge the treated water, so that it does not require electric power and energy-saving operation is possible. Further, when the permeated water amount of the submerged membrane 16 decreases, that is, when the treated water amount decreases, the submerged membrane 16 itself is washed with sodium hypochlorite or the like.
- the oxygen dissolution efficiency in the nitrification tank 11 is greatly increased, and the operation time of the nitrification tank blower 30 is greatly increased.
- the upper part of the nitrification tank 11 It was possible to maintain the dissolved oxygen in the aerobic part 12.
- the micro / nano bubble reactor 31 has a micro / nano bubble generator 32 installed therein.
- the micro / nano bubble generator 32 is connected with an air suction pipe 34 and a water supply pipe 33 for treated water from the submerged membrane 16.
- air is supplied from the air suction pipe 34, and treated water is supplied from the water supply pipe 33.
- the micro / nano bubble generator 32 generates micro / nano bubbles from the treated water and air.
- the micro / nano bubble generator 32 a commercially available one can be adopted, and the manufacturer is not limited.
- the micro-nano bubble generator 32 can be a product from Nano-Branet Research Institute.
- the micro / nano bubble generated in the micro / nano bubble generator 32 is present in the treated water introduced from the submerged membrane 16 to generate micro / nano bubble water.
- the micro / nano bubble water containing the micro / nano bubbles passes through the pipe 37 and is sprinkled from the upper water spray pipe 19A of the scrubber 18 as scrubber washing water.
- the exhaust gas is introduced into the lower portion 18B of the scrubber 18 through the exhaust gas power exhaust gas inlet 20 containing the aminoethanol used in the production apparatus by an exhaust fan (not shown). Since micro-nano bubbles are present in the scrubber wash water, aminoethanol in the exhaust gas introduced from the exhaust gas inlet 20 to the lower portion 18B is efficiently transferred to the wash water side.
- the scrubber 18 is provided with two water spray pipes 19A and 19B in the region of the upper part 18A in the vertical direction.
- the upper water spray pipe 19A is disposed above the lower water spray pipe 19B. As described above, the upper water spray pipe 19A is connected to the pipe 37 into which the scrubber washing water from the micro / nano bubble reaction tank 31 is introduced.
- the lower sprinkler pipe 19B pumps up the wash water stored in the lower area in the scrubber 18 with the circulation pump 35, which is the circulation section, and the lower sprinkler pipe 19B is also sprinkled as circulating water.
- Washing water containing micro-nano bubbles and circulating water containing micro-nano bubbles stored in the lower part 18B of the scrubber 18 are introduced into the adjustment tank 1 as aminoethanol-containing waste water.
- an exhaust gas containing aminoethanol used in an exhaust gas force production apparatus containing a volatile organic compound has been described.
- the exhaust gas include exhaust gas containing aminoethanol, exhaust gas containing isopropyl alcohol, exhaust gas containing acetone, and exhaust gas containing butyl acetate.
- FIG. 2 shows a second embodiment of the exhaust gas waste water treatment apparatus of the present invention.
- This second embodiment is different from the above-described first embodiment only in that the force S is added to the micro / nano bubble water flowing in the pipe 37 between the micro / nano bubble reaction tank 31 and the scrubber 18.
- alkali is added to the micro / nano bubble water used as the scrubber washing water in the scrubber 18, the exhaust gas treatment performance in the scrubber 18 can be improved.
- alkali to be added include caustic soda.
- FIG. 3 shows a third embodiment of the exhaust gas waste water treatment apparatus of the present invention.
- the third embodiment is different from the above-described first embodiment only in that the acid is added to the micro / nano bubble water flowing in the pipe 37 between the micro / nano bubble reaction tank 31 and the scrubber 18.
- the acid is added to the micro / nano bubble water used as the scrubber washing water in the scrubber 18, the exhaust gas treatment performance in the scrubber 18 can be improved.
- An example of the acid to be added is sulfuric acid.
- FIG. 4 shows a fourth embodiment of the exhaust gas waste water treatment apparatus of the present invention.
- This fourth embodiment is different from the first embodiment described above only in that ozone water is added to the micro / nano bubble water flowing in the pipe 37 between the micro / nano bubble reaction tank 31 and the scrubber 18.
- ozone water is added to the micro / nano bubble water used as the scrubber washing water in the scrubber 18, so that the exhaust gas treatment performance in the scrubber 18 can be improved.
- FIG. 5 shows a fifth embodiment of the exhaust gas waste water treatment apparatus of the present invention.
- the denitrification tank 3 and the nitrification tank 11 in the first embodiment were filled with a filler!
- the denitrification tank 3N and the nitrification tank 11N were filled with a filler as a filler. Filled with polyvinylidene chloride fillings 36A and 36B. Therefore, in the fifth embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals and detailed description thereof is omitted, and parts different from the first embodiment will be described.
- the denitrification tank 3N and the nitrification tank 11N are filled with the polysalt vinylidene fillers 36A and 36B. Due to the polyvinylidene chloride fillers 36A and 36B, the average concentration of each tank in each tank 3N and 11N is higher than that in the case where there is no filler. In addition, microorganisms adhere to and propagate on the polysalt vinylidene fillers 36A and 36B, making the microorganisms more stable and improving the nitrogen treatment capacity for high-concentration nitrogen wastewater as compared to the case without the filler.
- the polyvinylidene chloride fillers 36A and 36B are disposed in the entire water tanks 3N and 11N because the concentration of microorganisms in the entire tank becomes high. With the passage of time from the trial operation of this exhaust gas wastewater treatment device, microorganisms propagate in the polysalt / vinylidene fillers 36A and 36B.
- the microbial concentration on the surface of this polysalt / vinylidene filler 36A, 36B is 30000 ppm or more, leading to an improvement in nitrogen treatment efficiency.
- the material of the polysalt vinylidene filler 36A, 36B is a salt vinylidene which is strong and is not affected by chemical substances, and can be used semipermanently.
- this poly salty vinylidene filling 36A, 36B Should be selected according to the characteristics of the power drainage with products such as biocodes, ring races, biomulti-leafs, and biomodules.
- products such as biocodes, ring races, biomulti-leafs, and biomodules.
- ammonia nitrogen in the treated water is oxidized and decomposed by aerobic microorganisms into nitrate nitrogen and nitrite nitrogen.
- the exhaust gas containing aminoethanol used in the exhaust gas force production apparatus containing a volatile organic compound is described.
- the exhaust gas include exhaust gas containing aminoethanol, exhaust gas containing isopropyl alcohol, exhaust gas containing acetone, and exhaust gas containing butyl acetate.
- the volatile organic compounds contained in the exhaust gas are all those called volatile organic compounds (VOC).
- An experimental apparatus having the same configuration as that of the first embodiment shown in FIG. 1 was manufactured.
- the capacity of the adjustment tank 1 was 50 liters
- the capacity of the denitrification tank 3 was 100 liters
- the capacity of the nitrification tank 11 was 200 liters
- the capacity of the micro / nano bubble reaction tank 31 was 20 liters.
- the microorganism concentration is set to 18000ppm and the production equipment capacity of the factory is drained. Introduced continuously in one. Then, after the passage of one month, the nitrogen concentration at the outlet of the gravity pipe 17 was measured after waiting for the water quality to stabilize, and it was found to be 18 ppm.
- FIG. 6A shows an example of a timing chart showing the residence time of treated water in each tank in the first to fifth embodiments when the nitrogen concentration of the high concentration nitrogen waste water is 2000 ppm.
- FIG. 6B shows an example of a timing chart showing the residence time of treated water in each tank in the first to fifth embodiments when the nitrogen concentration of the high-concentration nitrogen drainage is 4000 ppm.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Molecular Biology (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treating Waste Gases (AREA)
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- Biological Treatment Of Waste Water (AREA)
Abstract
Description
Claims
Priority Applications (2)
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CN2006800068493A CN101132994B (zh) | 2005-03-04 | 2006-01-31 | 废气废水处理装置以及废气废水处理方法 |
US11/816,867 US7691268B2 (en) | 2005-03-04 | 2006-01-31 | Waste gas/wastewater treatment equipment and method of treating waste gas/wastewater |
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JP2005-060621 | 2005-03-04 | ||
JP2005060621 | 2005-03-04 | ||
JP2005-363794 | 2005-12-16 | ||
JP2005363794A JP3893402B2 (ja) | 2005-03-04 | 2005-12-16 | 排ガス排水処理装置および排ガス排水処理方法 |
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WO2006095510A1 true WO2006095510A1 (ja) | 2006-09-14 |
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PCT/JP2006/301552 WO2006095510A1 (ja) | 2005-03-04 | 2006-01-31 | 排ガス排水処理装置および排ガス排水処理方法 |
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US (1) | US7691268B2 (ja) |
JP (1) | JP3893402B2 (ja) |
CN (1) | CN101132994B (ja) |
TW (1) | TW200635862A (ja) |
WO (1) | WO2006095510A1 (ja) |
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WO2023074681A1 (ja) * | 2021-10-26 | 2023-05-04 | 国立大学法人北海道大学 | 排水処理装置及び排水処理方法 |
Also Published As
Publication number | Publication date |
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US20090127188A1 (en) | 2009-05-21 |
US7691268B2 (en) | 2010-04-06 |
CN101132994A (zh) | 2008-02-27 |
JP2006272317A (ja) | 2006-10-12 |
TW200635862A (en) | 2006-10-16 |
JP3893402B2 (ja) | 2007-03-14 |
TWI312339B (ja) | 2009-07-21 |
CN101132994B (zh) | 2011-03-09 |
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