Municipal domestic sewage AOA mud-membrane mixed deep nitrogen and phosphorus removal system

Abstract

The invention discloses a municipal domestic sewage AOA mud-membrane mixed deep nitrogen and phosphorus removal system, which comprises the following operation steps that municipal domestic sewage enters a biochemical system and is mixed with first reflux sludge in an anaerobic tank, phosphorus-accumulating bacteria and glycogen-accumulating bacteria in the sludge utilize a carbon source in raw water to synthesize an internal carbon source in vivo, then the sludge enters an aerobic zone, phosphorus-accumulating bacteria in the aerobic zone perform aerobic excessive phosphorus absorption to completely absorb phosphorus in the domestic sewage while activated sludge in the aerobic zone and nitrifying bacteria on a filler perform nitrification under the aerobic condition, at the moment, the mixed liquid and the sludge reflux to enter the anoxic zone, and the activated sludge and endogenous denitrifying bacteria on the filler perform deep denitrification on nitrate nitrogen in the sewage by utilizing an internal carbon source accumulated in the anaerobic zone. According to the invention, the system consists of a pretreatment unit, an AOA mud-membrane mixed reactor, a secondary sedimentation tank and a disinfection system, and the effluent reaches the four-class standard.

Description

technical field [0001] The invention relates to the field of sewage biological treatment, in particular to an urban domestic sewage AOA mud film mixed deep nitrogen and phosphorus removal system. Background technique [0002] Domestic sewage AOA mud film mixed deep nitrogen and phosphorus removal system is a supporting method for domestic sewage denitrification and phosphorus removal. Nowadays, the discharge of domestic sewage has attracted more and more attention. There are nitrogen, phosphorus, etc. in domestic sewage , will cause eutrophication of the water body, and it needs to be treated before discharge, and it can be discharged and utilized after reaching the standard. The requirements are also getting higher and higher. [0003] The existing domestic sewage AOA mud film mixed deep nitrogen and phosphorus removal system has certain disadvantages in use. First, the operation of nitrogen and phosphorus removal is relatively troublesome and the degree of systematization...

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Problems solved by technology

[0003] The existing domestic sewage AOA mud film mixed deep nitrogen and phosphorus removal system has certain disadvantages in use. First, the operation of nitrogen and phosphorus removal is more troublesome and the degree of systematization is low, which is not conducive to people's use. In addition, It cannot meet the sewage discharge standards well, and it is prone to pollution, which has brought certain adverse effects to people's use process. Therefore, we propose a system for urban domestic sewage AOA mud film mixed deep nitrogen and phosphorus removal

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