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CN-117865348-B - Sewage treatment method

CN117865348BCN 117865348 BCN117865348 BCN 117865348BCN-117865348-B

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method, which comprises an EGSB anaerobic reactor and an OAO pure film biological pond sequentially arranged along the water flow direction, wherein the OAO pure film biological pond sequentially comprises a first aerobic area, an anoxic area and a second aerobic area along the water flow direction, the first aerobic area is provided with an MABR component, the anoxic area is provided with an A type MBBR filler, the second aerobic area is provided with a B type MBBR filler, the treatment method comprises the steps of A) anaerobic treatment of sewage in the EGSB anaerobic reactor, B) synchronous nitrification and anaerobic ammoxidation of the sewage in the first aerobic area, C) anaerobic ammoxidation of the sewage in the anoxic area, and D) nitrification of the sewage in the second aerobic area. The invention can realize the high-efficiency autotrophic denitrification of sewage and obviously reduce the energy consumption in the sewage treatment process.

Inventors

  • ZHANG QIANG
  • JIN PENGFEI
  • MA QIAN
  • LI YI
  • LI YUENING

Assignees

  • 北京恩菲环保股份有限公司

Dates

Publication Date
20260512
Application Date
20240112

Claims (10)

  1. 1. A sewage treatment method adopts a system which sequentially comprises an EGSB anaerobic reactor and an OAO pure membrane biological pond along the water flow direction; The OAO pure film biological pond sequentially comprises a first aerobic zone, an anoxic zone and a second aerobic zone along the water flow direction, wherein the second aerobic zone is provided with a water outlet; The first aerobic zone is provided with an MABR component; The anoxic zone is provided with an A-type MBBR filler, wherein the A-type MBBR filler is arranged in a suspension manner, the filling ratio of the A-type MBBR filler is 30% -50%, the diameter of the A-type MBBR filler is 18-22 mm, the thickness of the A-type MBBR filler is 4-6 mm, and the middle of the A-type MBBR filler is porous; B-type MBBR filler is arranged in the second aerobic zone, the B-type MBBR filler is arranged in a suspension mode, the filler filling ratio of the B-type MBBR filler is 30% -50%, the diameter of the B-type MBBR filler is 8-12 mm, the thickness of the B-type MBBR filler is 4-6 mm, and the middle of the B-type MBBR filler is porous; The processing method comprises the following steps: a) Anaerobic treatment is carried out on sewage in an EGSB anaerobic reactor; The sewage contains 22.0-56.8 mg/L of NH 3 -N, 30.5-68.7 mg/L of TN, 110.0-142 mg/L of BOD, 152.0-436.0 mg/L of COD and 3.02-7.36 mg/L of TP; b) Conveying the sewage subjected to anaerobic treatment to a first aerobic zone to synchronously perform nitrification and anaerobic ammoxidation reaction; C) Conveying the reacted sewage to an anoxic zone for anaerobic ammoxidation reaction; Anaerobic ammonia oxidizing bacteria are enriched on the surface of the A-type MBBR filler and are responsible for converting the nitrite accumulated in the MABR aerobic zone and the residual ammonia nitrogen into nitrogen through anaerobic ammonia oxidation; d) Conveying the sewage after the reaction in the step C) to a second aerobic zone for nitration reaction to obtain a treated water body; the B-type MBBR filler is enriched with nitrifying bacteria and is responsible for completely converting the residual ammonia nitrogen in the sewage into nitrate; the method for treating the sewage realizes the high-efficiency autotrophic denitrification of the sewage, and the OAO pure-film biological pond system does not need internal reflux and external reflux.
  2. 2. The sewage treatment method according to claim 1, wherein anaerobic granular sludge is arranged in the EGSB anaerobic reactor, and the methanogenic activity of the anaerobic granular sludge in the EGSB anaerobic reactor is more than 0.31 kg COD/(kg VSS. D); the organic matter load of the EGSB anaerobic reactor at normal temperature is 2-6 kg COD/(m 3 . D).
  3. 3. The sewage treatment method according to claim 1, wherein a water inlet is provided at the bottom of the EGSB anaerobic reactor; and a biogas outlet is arranged at the top of the EGSB anaerobic reactor.
  4. 4. The wastewater treatment method according to claim 1, wherein the volume ratio of the MABR module in the first aerobic zone is 45% -55%; the bottom of the first aerobic zone is provided with a first submersible stirrer.
  5. 5. The wastewater treatment method according to claim 1, wherein a second submersible mixer is provided at the bottom of the anoxic zone.
  6. 6. The sewage treatment method according to claim 1, wherein a third submersible mixer is provided at the bottom of the second aerobic zone.
  7. 7. The sewage treatment method according to claim 1, wherein the concentration of anaerobic granular sludge in the EGSB anaerobic reactor is 10-25 g/L, and the hydraulic retention time is controlled to be 3-15 h; And the effluent C/N of the EGSB anaerobic reactor is 1-2.
  8. 8. The wastewater treatment method according to claim 1, wherein the hydraulic retention time of the first aerobic zone is controlled to be 2-5 hours, and the dissolved oxygen in water is controlled to be less than 0.5 mg/L.
  9. 9. The sewage treatment method according to claim 1, wherein the hydraulic retention time of the anoxic zone is controlled to be 1-2 hours.
  10. 10. The sewage treatment method according to claim 1, wherein the hydraulic retention time of the second aerobic zone is controlled to be 1-2 h, and the dissolved oxygen in water is controlled to be more than 3 mg/L.

Description

Sewage treatment method Technical Field The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method. Background Municipal wastewater treatment plants widely adopt a biological method as a main process, and organic matters, nitrogen and phosphorus in the wastewater are removed by virtue of the action of microorganisms. However, the traditional nitrification/denitrification sewage denitrification process has the problems of high aeration energy consumption, large external carbon source addition amount and large residual sludge yield. How to reduce the energy consumption in the sewage treatment process, promote the energy source supply in the sewage treatment process, and realize the recovery of energy and resources in sewage is a new development direction of sewage treatment plants. Disclosure of Invention In view of the above, the technical problem to be solved by the invention is to provide a sewage treatment method which can realize efficient autotrophic denitrification of sewage and remarkably reduce the energy consumption in the sewage treatment process. The invention provides a sewage treatment method, wherein a system adopted by the sewage treatment method sequentially comprises an EGSB anaerobic reactor and an OAO pure membrane biological pond along the water flow direction; The OAO pure film biological pond sequentially comprises a first aerobic zone, an anoxic zone and a second aerobic zone along the water flow direction, wherein the second aerobic zone is provided with a water outlet; The first aerobic zone is provided with an MABR component; The anoxic zone is provided with an A type MBBR packing; B-type MBBR packing is arranged in the second aerobic zone; The processing method comprises the following steps: a) Anaerobic treatment is carried out on sewage in an EGSB anaerobic reactor; b) Conveying the sewage subjected to anaerobic treatment to a first aerobic zone to synchronously perform nitrification and anaerobic ammoxidation reaction; C) Conveying the reacted sewage to an anoxic zone for anaerobic ammoxidation reaction; D) And C) conveying the sewage after the reaction in the step C) to a second aerobic zone for nitration reaction to obtain the treated water body. Preferably, anaerobic granular sludge is arranged in the EGSB anaerobic reactor, and the methanogenesis activity of the anaerobic granular sludge in the EGSB anaerobic reactor is more than 0.31kg COD/kgVSS.d; the organic matter load of the EGSB anaerobic reactor at normal temperature is 2-6 kg COD/(m 3. D). Preferably, a water inlet is arranged at the bottom of the EGSB anaerobic reactor; and a biogas outlet is arranged at the top of the EGSB anaerobic reactor. Preferably, in the first aerobic zone, the volume ratio of the MABR component is 45% -55%; the bottom of the first aerobic zone is provided with a first submersible stirrer. Preferably, in the anoxic zone, A-type MBBR filler is arranged in a suspended manner, the filling ratio of the A-type MBBR filler is 30% -50%, the diameter of the A-type MBBR filler is 18-22 mm, the thickness of the A-type MBBR filler is 4-6 mm, and the middle of the A-type MBBR filler is porous; The bottom of the anoxic zone is provided with a second submersible stirrer. Preferably, in the second aerobic zone, B-type MBBR filler is arranged in a suspended mode, the filler filling ratio of the B-type MBBR filler is 30% -50%, the diameter of the B-type MBBR filler is 8-12 mm, the thickness of the B-type MBBR filler is 4-6 mm, and the middle of the B-type MBBR filler is porous; And a third submersible stirrer is arranged at the bottom of the second aerobic zone. Preferably, the concentration of anaerobic granular sludge in the anaerobic EGSB reactor is 10-25 g/L, and the hydraulic retention time is controlled to be 3-15 h; And the C/N of the effluent of the anaerobic EGSB reactor is 1-2. Preferably, the hydraulic retention time of the first aerobic zone is controlled to be 2-5 h, and the dissolved oxygen in water is controlled to be below 0.5 mg/L. Preferably, the hydraulic retention time of the anoxic zone is controlled to be 1-2 hours. Preferably, the hydraulic retention time of the second aerobic zone is controlled to be 1-2 h, and the dissolved oxygen in water is controlled to be more than 3 mg/L. The invention provides a sewage treatment method, which comprises the following steps of A) carrying out anaerobic treatment on sewage in an EGSB anaerobic reactor, B) conveying the sewage after anaerobic treatment to a first aerobic zone to synchronously carry out nitrification and anaerobic ammoxidation reaction, C) conveying the sewage after the reaction to a second aerobic zone to carry out anaerobic ammoxidation reaction, and D) conveying the sewage after the reaction in the step C) to a second aerobic zone to carry out nitrification reaction to obtain a water body after the treatment. According to the invention, the recovery of energy materials is realized