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

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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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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