Method for performing denitrifying phosphorus removal through anaerobism-nitration-oxygen deprivation-nitration technology

Abstract

The invention provides a method for performing denitrifying phosphorus removal through an anaerobism-nitration-oxygen deprivation-nitration technology, and belongs to the technical field of municipal sewage treatment. Domestic sewage firstly enters an A2SBR reactor, and PHA and released phosphorus are stored in the anaerobic stage; static setting draining is performed, supernatant liquor rich in ammonia nitrogen enters an N-SBR reactor to complete a nitration reaction, and after the reaction is finished, nitrated liquor yielding water flows back to the A2SBR reactor to generate an oxygen deprivation denitrifying phosphorus removal reaction; after the reaction is finished, static setting is performed, and drained water enters the N-SBR reactor again to perform a nitration reaction of retained ammonia nitrogen; after the nitration reaction is finished, static setting is performed, and yielding water is drained out of a system. According to the method, a double sludge theory and a denitrifying phosphorus removal technique are applied, the new A2N2 technology which is operated according to the sequence of anaerobism, nitration, oxygen deprivation and nitration is represented, and through flexible control over the SBR reacting sequence, the problem that the ammonia nitrogen content is too high in yielding water of a traditional A2N technology is solved, and deep denitrification is achieved; meanwhile, carbon resources are saved, and the method is suitable for the current situation of the domestic sewage with the low C-N ratio in China.

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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