A2N-SBR (anaerobic/anoxic/nitrification-sequencing batch reactor) improved deep denitrification and dephosphorization technology of sewage

Abstract

The invention discloses an A2N-SBR (anaerobic / anoxic / nitrification-sequencing batch reactor) improved deep denitrification and dephosphorization technology of sewage and belongs to the technical field of biological sewage treatment. The technology comprises the steps: performing anaerobic reaction on the domestic sewage in an A2 / O-SBR, adding nitrification liquid into the A2 / O-SBR (anaerobic / anoxic / oxic-sequencing batch reactor) for denitrification and dephosphorization reaction under an oxygen deficient condition, after transitory aerobic treatment, standing for layering, discharging supernate, putting the supernate in an N-SBR with polypropylene suspension filling for shortcut nitration reaction under an aerobic condition, then standing, and obtaining supernatant, namely the nitrification liquid. According to the technology, granule sludge is coupled with a shortcut denitrification and dephosphorization technique in the A2N-SBR; the tank capacity is reduced; the reaction time is shortened; the floor area is saved; and at the same time, economical and high-efficiency deep denitrification and dephosphorization are achieved. The technology is applicable to the treatment of the nitrogenous and phosphorous municipal domestic sewage.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment. Background technique [0002] In the 1970s and 1980s, it was discovered that phosphorus accumulating bacteria could produce NO 2 - -N is an electron acceptor to complete the phenomenon of synchronous denitrification and phosphorus uptake. [0003] A 2 The N (Anaerobic / Anoxic / Nitrification) process is a process developed based on the theory of denitrification phosphorus removal technology. It is a dual-sludge system combining biofilm method and activated sludge method. A 2 The N process separates the long and short sludge ages, which has the advantages of "one carbon, two uses", saving aeration, reducing energy consumption for reflux, low sludge yield, and separate culture of dominant bacteria. COD is used to the greatest extent for anaerobic phosphorus release to synthesize PHA. In the anoxic stage, PHA is used for simultaneous denitrification and phosphorus removal by de...

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Problems solved by technology

[0004] For traditional post-denitrification phosphorus removal A 2 The N process has problems such as low influent C / N, low nitrogen and phosphorus removal efficiency, and high energy consumption. The present invention proposes an A 2 N-SBR improved sewage deep nitrogen and phosphorus removal process to solve the traditional A 2 N process effluent NH 4 + -N too high problem

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