Composite biological film activated sludge denitrification dephosphorization denitrification method and reactor thereof

Abstract

The invention relates to the sewage biochemical treatment and sewage resource utilization field, in particular to a method for the denitrifying phosphorus removal and denitrification of activated sludge in a composite biological film and a reactor thereof. Through forming four reaction tanks in an integrated reactor, namely an anoxic tank, an aerobic tank, a sediment tank and a sludge anaerobic tank, filling materials are respectively added in the anoxic tank and the aerobic tank; denitrifying phosphorus-accumulating bacteria is enriched by utilizing the special structure of the biological film; the contradiction of denitrification and the phosphorus removal on the competition of sludge ages and a carbon source in the traditional process is effectively overcome through the steps of anaerobic phosphorus release, denitrifying phosphorus removal, aerobic nitration, denitrifying phosphorous accumulation, and solid-liquid separation in the integrated reactor, so that the optimal effects of the denitrification and the phosphorus removal are achieved simultaneously; and the invention is particularly suitable for the treatment of municipal sewage with low carbon-nitrogen ratio, has optimal phosphorus removal effect, and is conductive to the recovery and the utilization of phosphorous.

Description

technical field [0001] The invention relates to the fields of sewage biochemical treatment and sewage resource utilization, in particular to a method for denitrification, phosphorus and nitrogen removal of composite biofilm activated sludge and a reactor thereof. Background technique [0002] Existing sewage phosphorus and nitrogen removal technologies can be divided into physical, chemical and biological methods. Relatively speaking, biological phosphorus and nitrogen removal technology is widely used because of its low investment, simple operation and no secondary pollution. [0003] The basic principle of sewage biological phosphorus and nitrogen removal: [0004] The biological denitrification process is completed through three steps of ammonification, nitrification and denitrification. The nitrification and denitrification reactions can be represented by the following formula: [0005] The nitrification reaction consists of two steps: [0006] (1) NH 4 + +1.5O 2 ...

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Problems solved by technology

Ren Nanqi et al. mentioned in Chinese Patent No. 200610009602 that A 2 The mixed solution in O was refluxed to cultivate and enrich the denitrifying phosphorus-accumulating bacteria, and a composite activated sludge biofilm synchronous denitrification and phosphorus removal system was developed, which achieved stable operation results, and the effluent reached the pollutant discharge standard of urban sewage treatment plants. It is required by the first-level B standard, but the traditional anaerobic-anoxic-aerobic process is used. The addition of biological fillers is mainly to improve the nitrification effect of the system. The process is relatively complicated, the capital investment is high, and the operation and management are difficult.

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