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A method for denitrification phosphorus removal through anaerobic/nitrification/anoxic/nitrification process

A denitrification dephosphorization and nitrification reactor technology, applied in the direction of aerobic and anaerobic treatment, can solve the problems of sludge age contradiction between phosphorus accumulating bacteria and nitrifying bacteria, insufficient carbon source, high ammonia nitrogen in effluent, and improve the utilization rate , saving carbon and energy

Active Publication Date: 2017-12-15
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] What the invention provides is a kind of through anaerobic / nitrification / anoxic / nitrification (A 2 N 2 ) technology for denitrification and phosphorus removal. This invention solves the problems of sludge age contradiction between phosphorus accumulating bacteria and nitrifying bacteria and insufficient carbon source. At the same time, the traditional A 2 The problem of excessive ammonia nitrogen in the effluent of the N process realizes the simultaneous deep removal of nitrogen and phosphorus

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  • A method for denitrification phosphorus removal through anaerobic/nitrification/anoxic/nitrification process
  • A method for denitrification phosphorus removal through anaerobic/nitrification/anoxic/nitrification process
  • A method for denitrification phosphorus removal through anaerobic/nitrification/anoxic/nitrification process

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Embodiment approach

[0021] 1) The domestic sewage is passed through the raw water tank (1) through A 2 SBR inlet pump (2) into A 2 In the SBR reactor (5), after the water inflow is completed, the agitator (3) starts to stir, and the denitrifying phosphorus accumulating bacteria use the VFAs in the raw water to synthesize the internal carbon source PHA, and at the same time release the phosphate in the body to the outside. This stage controls A 2 DO≤0.02mg / L in SBR reactor, ORP=-150~-220mv, pH=6.5-7.3, water filling ratio 0.7, reaction time 1.5-2h. During this process, most of the COD is removed, and after the anaerobic stage reaction is completed, the water is drained quietly, and the supernatant rich in ammonia nitrogen enters the intermediate water tank (6).

[0022] 2) The N-SBR reactor (8) pumps the supernatant rich in ammonia nitrogen in the intermediate water tank (6) into the reactor through the N-SBR inlet pump (7), the water filling ratio is 0.7, and the air pump (4) turns on the aerat...

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Abstract

The invention discloses a method for denitrification phosphorus removal through anaerobic / nitrification / anoxic / nitrification process, which belongs to the technical field of municipal sewage treatment. The domestic sewage first enters the A2SBR reactor, stores PHA and releases phosphorus in the anaerobic stage, then settles and drains water, and the supernatant rich in ammonia nitrogen enters the N‑SBR reactor to complete the nitrification reaction. After the reaction, the nitrification liquid effluent flows back to the A2SBR for reaction Anoxic denitrification and phosphorus removal reaction occurs in the reactor. After the reaction, it settles still, and the drain water enters the N-SBR reactor again for the nitrification reaction of the remaining ammonia nitrogen. After the nitrification reaction, it settles quietly, and the effluent is discharged out of the system. The present invention applies double sludge theory and denitrification dephosphorization technology, proposes a new A2N2 process operating in accordance with anaerobic / nitrification / anoxic / nitrification, and solves the problem of excessive ammonia nitrogen in the effluent of the traditional A2N process by flexibly controlling the SBR reaction sequence. It can achieve deep denitrification while saving carbon sources, which is suitable for the current situation of domestic sewage with low C / N ratio in my country.

Description

technical field [0001] The present invention relates to a kind of through anaerobic / nitrification / anoxic / nitrification (A 2 N 2 ) process for denitrification and dephosphorization, which belongs to the technical field of sewage treatment, and is suitable for urban domestic sewage with low C / N ratio, scattered rural domestic sewage, and new sewage plants or old sewage plant upgrades using intermittent SBR processes, etc. field. Background technique [0002] At present, the focus of global water pollution control has shifted from simple organic pollution control to the study of eutrophication caused by nutrients such as nitrogen and phosphorus. The deep denitrification and phosphorus removal of sewage has become the difficulty and the core. The C / N of municipal sewage in my country is generally low, which often cannot meet the needs of simultaneous denitrification and phosphorus removal. However, the traditional process has the contradiction of sludge age between phosphorus ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻赵伟华王梅香张勇吕冬梅王淑莹
Owner BEIJING UNIV OF TECH
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