WO2022270447A1 - 排水処理装置及び排水処理方法 - Google Patents

排水処理装置及び排水処理方法 Download PDF

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Publication number
WO2022270447A1
WO2022270447A1 PCT/JP2022/024449 JP2022024449W WO2022270447A1 WO 2022270447 A1 WO2022270447 A1 WO 2022270447A1 JP 2022024449 W JP2022024449 W JP 2022024449W WO 2022270447 A1 WO2022270447 A1 WO 2022270447A1
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Prior art keywords
zone
nitrification
denitrification
diffusion
reaction
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Ceased
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PCT/JP2022/024449
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English (en)
French (fr)
Japanese (ja)
Inventor
タン フォン グェン
敦 渡邉
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Maezawa Industries Inc
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Maezawa Industries Inc
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Priority to JP2023530448A priority Critical patent/JPWO2022270447A1/ja
Publication of WO2022270447A1 publication Critical patent/WO2022270447A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a wastewater treatment device and a wastewater treatment method.
  • nitrifying bacteria organic sludge containing microorganisms (hereinafter referred to as "activated sludge”), convert ammonia contained in wastewater into nitrous acid and nitric acid in the presence of oxygen.
  • a wastewater treatment apparatus is known in which a denitrifying reaction in which denitrifying bacteria, which are activated sludge in a state, converts to nitrogen, and a denitrifying reaction are performed in a single reaction tank (see, for example, Patent Document 1).
  • the reaction tank includes a partition plate that divides the nitrification reaction zone for carrying out the nitrification reaction and the denitrification reaction zone for carrying out the denitrification reaction.
  • Membrane separator for separating and removing solids contained in denitrifying sewage (hereinafter referred to as "treated water"), washing the surface of the membrane separator or supplying air necessary for nitrification reaction and an air diffuser for diffusing air bubbles.
  • the sewage When the sewage water level is higher than the upper end of the partition plate, the sewage overflows the partition plate and moves from the nitrification reaction area to the denitrification reaction area and returns from the denitrification reaction area to the nitrification reaction area. As a result, a circulation flow that circulates around the partition plate is formed. Therefore, nitrous acid and nitric acid produced in the nitrification reaction zone move to the denitrification reaction zone and are converted to nitrogen in the denitrification reaction zone.
  • the water level of the sewage is lower than the upper end of the partition, the sewage does not overflow the partition.
  • a circulation flow is not formed, nitrous acid and nitric acid are produced in the nitrification reaction zone, and the nitrous acid and nitric acid that have previously moved from the nitrification reaction zone to the denitrification reaction zone are converted into nitrogen in the denitrification reaction zone.
  • the dissolved oxygen amount DO which indicates the amount of oxygen dissolved in the waste water in the nitrification reaction area
  • the oxidation rate which indicates the redox power in the denitrification reaction area
  • Reduction potential ORP is used.
  • the dissolved oxygen amount DO in the nitrification reaction region is controlled to, for example, 1.5 mg/L or more, and the oxidation-reduction potential ORP in the denitrification reaction region is controlled to, for example, ⁇ 200 mv to ⁇ 100 mv, whereby the nitrification reaction and The denitrification reaction is properly carried out.
  • the scale of the circulating flow varies depending on the water level of the waste water in the reaction tank and the amount of aeration from the aeration device. Varies according to flow scale. Therefore, the dissolved oxygen amount DO in the nitrification reaction area and the oxidation-reduction potential ORP in the denitrification reaction area are not controlled within a certain range, and there is a risk that the nitrification reaction and the denitrification reaction will not be properly carried out.
  • the present invention provides a wastewater treatment apparatus and wastewater treatment method that can stably carry out nitrification and denitrification reactions by controlling the dissolved oxygen amount DO in the nitrification reaction area and the oxidation-reduction potential ORP in the denitrification reaction area.
  • the wastewater treatment apparatus of the present invention comprises a nitrification reaction for converting ammonia contained in wastewater into nitrous acid or nitric acid in the presence of oxygen, and nitrous acid or nitric acid produced based on the nitrification reaction.
  • a denitrification reaction that converts to nitrogen in anoxic conditions, in a wastewater treatment apparatus for performing a nitrification reaction zone for carrying out the nitrification reaction and a denitrification reaction zone for carrying out the denitrification reaction; a membrane separation device disposed in the nitrification reaction zone for separating and removing solids contained in waste water subjected to the nitrification reaction and the denitrification reaction; an air diffuser, a second air diffuser for diffusing bubbles other than the membrane separation device, a first diffusion zone through which the air bubbles diffused by the first air diffuser pass, and the second air diffuser.
  • the wastewater treatment method of the present invention comprises a nitrification reaction for converting ammonia contained in wastewater into nitrous acid or nitric acid in the presence of oxygen, and nitrous acid or nitric acid produced based on the nitrification reaction.
  • a dividing means for dividing a nitrification reaction zone for carrying out said nitrification reaction and a denitrification reaction zone for carrying out said denitrification reaction, said nitrification reaction zone and a membrane separation device for separating and removing solids contained in the waste water subjected to the nitrification reaction and the denitrification reaction, and a first air diffuser for diffusing air bubbles in the membrane separation device.
  • a second air diffuser for diffusing bubbles other than the membrane separation device, a first diffusion zone through which the air bubbles diffused by the first air diffuser pass, and the second air diffuser a second diffusion zone through which diffused bubbles pass, between the first diffusion zone and the second diffusion zone, and between the first diffusion zone and the dividing means and a circulation plate disposed in the wastewater treatment method, wherein the wastewater flows through the circulation plate based on the diffusion of the first air diffuser into the first air diffusion zone. and a transfer step of transferring the waste water from the nitrification reaction zone to the denitrification reaction zone.
  • the dissolved oxygen amount DO in the nitrification reaction area and the oxidation-reduction potential ORP in the denitrification reaction area can be controlled to stably carry out the nitrification reaction and the denitrification reaction.
  • FIG. 1 is a plan view schematically showing a waste water treatment apparatus according to an embodiment of the invention.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 and used for explaining the circulation plate.
  • FIG. 2 is a cross-sectional view taken along line BB in FIG. 1 and used for explaining the partition plate;
  • 2 is a flow chart showing a procedure of waste water treatment performed by the waste water treatment apparatus of FIG. 1;
  • FIG. 1 is a plan view schematically showing a waste water treatment device 10 according to an embodiment of the present invention.
  • the waste water treatment apparatus 10 of FIG. It has a stirrer 6 and an oxidation-reduction potentiometer 7 , a pump (not shown) is connected to the membrane separator 3 , and a blower (not shown) is connected to the air diffuser 4 .
  • Raw water stored in the raw water tank is supplied to the reaction tank 1 .
  • the partition plate 2 divides the reaction tank 1 into a nitrification reaction area D1 in which nitrifying bacteria convert ammonia into nitrite and nitric acid in the presence of oxygen, and a nitrite and nitric acid produced by denitrifying bacteria based on ammonia.
  • a membrane separation device 3 is arranged in the nitrification reaction zone D1
  • a stirrer 6 and an oxidation-reduction potential meter 7 are arranged in the denitrification reaction zone D2.
  • the membrane separation device 3 is a long housing having a plurality of hollow fiber membranes, and when installed in the reaction vessel 1, the longitudinal direction extends along the vertical direction.
  • Treated water obtained by subjecting waste water to be treated (hereinafter referred to as “water to be treated”) stored in the reaction tank 1 to nitrification and denitrification contains solids, and the membrane separation device 3 is a hollow fiber
  • the membrane separates and removes the solid content from the treated water, and the treated water from which the solid content has been separated and removed is discharged outside the reaction tank 1 .
  • the blower supplies air to the air diffuser 4, and the air diffuser 4 diffuses a large amount of minute air bubbles having an air diameter of 20 ⁇ m to 500 ⁇ m, for example, into the nitrification reaction area D1.
  • the air diffuser 4 includes an air diffuser 4a (first air diffuser) arranged directly below the membrane separation device 3 and an air diffuser 4b (second air diffuser) arranged in an area other than the area directly below the membrane separation device 3. air diffuser).
  • the air diffuser 4a diffuses a large amount of minute air bubbles into the membrane separation device 3.
  • the air bubbles diffused from the air diffuser 4a collide with the surfaces of the plurality of hollow fiber membranes constituting the membrane separation device 3, and the solid content separated and removed from the treated water adheres to the surfaces of the hollow fiber membranes.
  • the fouling phenomenon that occurs due to this is suppressed.
  • the air diffuser 4a diffuses a large amount of minute air bubbles, the air bubbles diffused from the air diffuser 4a collide with the surfaces of the hollow fiber membranes and coalesce when passing through the membrane separation device 3. become huge.
  • the air diffuser 4b has a dissolved oxygen control zone DZ (second diffusion zone) which is a region other than the membrane aeration zone MZ (first diffusion zone) through which the air bubbles diffused by the air diffuser 4a pass. It is arranged to supply minute air bubbles to the air zone).
  • DZ second diffusion zone
  • MZ first diffusion zone
  • the circulation plate 5 is arranged between the membrane aeration zone MZ and the dissolved oxygen control zone DZ.
  • a dissolved oxygen meter is arranged in the dissolved oxygen control zone DZ, and the dissolved oxygen amount DO in the nitrification reaction zone D1 is controlled based on the dissolved oxygen meter.
  • the dissolved oxygen amount DO in the nitrification reaction zone D1 may be controlled using at least one dissolved oxygen meter.
  • the nitrification reaction area D1 is divided into an aeration zone A and an aeration zone B, a dissolved oxygen meter DO1 is installed in the aeration zone A, and a dissolved oxygen meter DO2 is installed in the aeration zone B.
  • the dissolved oxygen amount DO in the nitrification reaction area D1 can be adjusted more accurately than when one dissolved oxygen meter is used, and the maintainability can be improved.
  • the dissolved oxygen meters DO1 and DO2 are arranged in the dissolved oxygen control zone DZ. Therefore, the dissolved oxygen amount DO in the nitrification reaction area D1 is controlled based on the dissolved oxygen meters DO1 and DO2.
  • the diffusion amount is increased to increase the amount DO, and when the dissolved oxygen meters DO1 and DO2 indicate 1.5 mg/L or more, the diffuser 4b reduces the diffusion amount to suppress power consumption.
  • the denitrification reaction region D2 a water flow is generated based on the raw water flowing into the reaction tank 1 and the water to be treated passing through the overflow opening 2c and the return opening 2d, which will be described later.
  • the water force of the water flow generated in the denitrification reaction zone D2 is very slow, for example, less than 10 cm/s, and the denitrification reaction zone D2 is not sufficiently agitated by the water flow alone. Therefore, the denitrifying bacteria are not dispersed throughout the denitrifying reaction area D2, and the denitrifying reaction cannot be carried out efficiently.
  • the agitator 6 is arranged in the denitrification reaction area D2 to sufficiently agitate the water to be treated in the denitrification reaction area D2. As a result, the denitrifying bacteria are dispersed throughout the denitrifying reaction area D2, and the denitrifying reaction can be carried out efficiently.
  • the oxidation-reduction potential meter 7 is arranged in the denitrification reaction area D2, and the oxidation-reduction potential of the denitrification reaction area D2 is controlled based on the oxidation-reduction potential meter 7. For example, when the oxidation-reduction potential meter 7 indicates ⁇ 200 mV or less, nitrous acid and nitric acid necessary for the denitrification reaction are insufficient, so the water to be treated in the nitrification reaction area D1 is supplied to the denitrification reaction area D2, When the oxidation-reduction potential meter 7 indicates ⁇ 100 mV or higher, oxygen is present in the denitrification reaction area D2, so that the amount of new raw water flowing into the denitrification reaction area D2 or the supply of the water to be treated in the nitrification reaction area D1 is reduced. Limited.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, which is used to explain the circulation plate 5. As shown in FIG.
  • the circulation plate 5 has an opening 5a (circulation plate opening) near the bottom of the reaction vessel 1.
  • the air diffuser 4a diffuses into the membrane separation device 3
  • the air bubbles diffused from the air diffuser 4a move upward in the vertical direction, and an upward flow is formed based on this, and the membrane aeration zone MZ
  • the water to be treated overflows the circulation plate 5 and moves to the dissolved oxygen adjustment zone DZ. Further, by forming an upward flow in the membrane aeration zone MZ, the water to be treated in the dissolved oxygen adjustment zone DZ moves to the membrane aeration zone MZ through the opening 5a.
  • the water to be treated moves from the dissolved oxygen adjustment zone DZ to the membrane aeration zone MZ, the water to be treated that overflows the circulation plate 5 forms a downward flow that descends to the bottom of the reaction tank 1 . That is, when the air diffuser 4a diffuses air into the membrane separation device 3, a circulation flow circulating through the circulation plate 5 is formed.
  • the size of the opening 5a (circulation plate opening) formed in the lower part of the circulation plate 5 may be any size as long as the circulation flow circulating in the circulation plate 5 is formed.
  • the opening 5a may be provided over the entire width in the horizontal direction, or the opening 5a may be provided in part of the width in the horizontal direction.
  • FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and is used to explain the partition plate 2.
  • FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and is used to explain the partition plate 2.
  • the partition plate 2 has an upper end 2a near the surface of the water to be treated and a lower end 2b in contact with the bottom of the reaction vessel 1.
  • the upper end 2a overflows near the membrane separation device 3. It has an opening 2c (first opening), and the lower end 2b has a return opening 2d (second opening) near the dissolved oxygen meter DO1.
  • the overflow opening 2c has an overflow end 2e, and the water level of the water to be treated in the reaction vessel 1 is lower than the upper end 2a and higher than the overflow end 2e.
  • the overflow opening 2c and the return opening 2d are preferably positioned diagonally in the partition plate 2. As shown in FIG.
  • the water to be treated in the nitrification reaction zone D1 moves to the denitrification reaction zone D2 via the overflow opening 2c, and the water to be treated in the denitrification reaction zone D2 passes through the return opening 2d to the nitrification reaction zone D1. move to
  • the overflow opening 2c may have a water amount adjusting device (change means) for adjusting the amount of water to be treated that moves from the nitrification reaction area D1 to the denitrification reaction area D2.
  • a water amount adjusting device for example, a movable weir that moves from the overflow end 2e to the water surface of the water to be treated, a rubber weir that expands with air or water, or an undulating weir that uses a rubber weir is used.
  • the water amount adjusting device operates when controlling the amount of water to be treated that moves from the nitrification reaction area D1 to the denitrification reaction area D2, and changes the opening range of the overflow opening 2c.
  • FIG. 4 is a flow chart showing the procedure of wastewater treatment performed by the wastewater treatment apparatus 10 of FIG.
  • water to be treated is supplied to the reaction tank 1 (S1). At this time, the water level of the water to be treated is lower than the upper end portion 2a and higher than the overflow end portion 2e.
  • the air diffuser 4a arranged in the membrane aeration zone MZ is arranged to prevent the generation of minute air bubbles in the membrane separation device 3 in order to suppress the occurrence of the fouling phenomenon of the hollow fiber membranes constituting the membrane separation device 3. a large amount of aeration. Thereby, a circulation flow that circulates through the circulation plate 5 is formed.
  • the air diffuser 4b arranged in the dissolved oxygen control zone DZ diffuses a large amount of fine air bubbles to ensure the required dissolved oxygen amount DO in the nitrification reaction zone D1 (S2). In the present embodiment, whether or not the dissolved oxygen amount DO is ensured is determined based on the dissolved oxygen meters DO1 and DO2.
  • the water to be treated that has undergone the nitrification reaction in the nitrification reaction area D1 moves to the denitrification reaction area D2 via the overflow opening 2c (S3), and the agitator 6 moves to the denitrification reaction area D2.
  • the treated water is stirred (S4).
  • the water to be treated that has undergone the denitrification reaction in the denitrification reaction area D2 moves to the nitrification reaction area D1 via the return opening 2d (S5).
  • the water to be treated that has moved to the nitrification reaction area D1 in S5 contains solids.
  • the water to be treated is discharged to the outside of the reaction tank 1 via the membrane separation device 3, the solid content is separated and removed by the membrane separation device 3 (S6), and this treatment is completed.
  • the water to be treated that has undergone the nitrification reaction in the nitrification reaction area D1 moves to the denitrification reaction area D2 via the overflow opening 2c (S3), whereupon the denitrification reaction area D2
  • the water to be treated that has undergone the denitrification reaction moves to the nitrification reaction area D1 via the return opening 2d (S5).
  • the amount of water to be treated circulating in the nitrification reaction zone D1 and the denitrification reaction zone D2 is controlled to a constant amount. Nitrification reaction and denitrification reaction can be stably carried out.
  • the air diffuser 4a diffuses a large amount of minute air bubbles into the membrane separation device 3, forming a circulation flow that circulates through the circulation plate 5 (S2, circulation step). Since the circulation flow sufficiently agitates the nitrification reaction zone D1, the nitrification reaction zone D1 is sufficiently agitated without requiring additional power. As a result, the nitrifying bacteria are dispersed throughout the nitrification reaction area D1, so that the nitrification reaction can be carried out efficiently.
  • the water to be treated that has undergone the nitrification reaction in the nitrification reaction area D1 moves to the denitrification reaction area D2 via the overflow opening 2c (S3, moving step).
  • a water flow based on the inflow of raw water and a water flow of the water to be treated via the overflow opening 2c and the return opening 2d are generated.
  • the denitrification reaction zone D2 is not sufficiently agitated by the water flow alone.
  • the agitator 6 agitates the water to be treated in the denitrification reaction area D2 (S4), so that the denitrifying bacteria are dispersed throughout the denitrification reaction area D2 and the denitrification reaction is efficiently carried out.
  • the power consumption increases by 5% when the stirrer 6 operates continuously. Further, power consumption increases by 1.5% when the stirrer 6 is intermittently operated by repeating operation for 2 minutes and stop for 7 minutes. Therefore, a certain power is required with the introduction of the stirrer 6, but since the air diffuser 4b is controlled based on the dissolved oxygen meters DO1 and DO2, the power consumption required for the waste water treatment device 10 is reduced to is reduced compared to the conventional method.
  • the overflow opening 2c and the return opening 2d are formed diagonally in the partition plate 2.
  • the position at which the water to be treated is supplied from the nitrification reaction zone D1 to the denitrification reaction zone D2 and the position at which the water to be treated returns from the denitrification reaction zone D2 to the nitrification reaction zone D1 are determined.
  • a certain amount of time can be reserved for the application of
  • the overflow opening 2c has a water amount adjusting device for adjusting the amount of water to be treated that moves from the nitrification reaction area D1 to the denitrification reaction area D2.

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
PCT/JP2022/024449 2021-06-22 2022-06-20 排水処理装置及び排水処理方法 Ceased WO2022270447A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008155080A (ja) * 2006-12-21 2008-07-10 Hitachi Ltd 汚水処理装置及びその方法
WO2018198422A1 (ja) * 2017-04-28 2018-11-01 国立大学法人北海道大学 膜分離活性汚泥処理装置及び膜分離活性汚泥処理方法
JP2020075224A (ja) * 2018-11-09 2020-05-21 前澤工業株式会社 汚水処理装置及び汚水処理方法
CN213388228U (zh) * 2020-08-21 2021-06-08 兰州理工大学 一种太阳能光伏发电联合膜生物反应器一体式装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008155080A (ja) * 2006-12-21 2008-07-10 Hitachi Ltd 汚水処理装置及びその方法
WO2018198422A1 (ja) * 2017-04-28 2018-11-01 国立大学法人北海道大学 膜分離活性汚泥処理装置及び膜分離活性汚泥処理方法
JP2020075224A (ja) * 2018-11-09 2020-05-21 前澤工業株式会社 汚水処理装置及び汚水処理方法
CN213388228U (zh) * 2020-08-21 2021-06-08 兰州理工大学 一种太阳能光伏发电联合膜生物反应器一体式装置

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