Step-feed multi-stage AO+MBR (Anoxic/Oxic+Membrane Biological Reactor) nitrogen and phosphorus removal system

Abstract

The invention discloses a step-feed multi-stage AO+MBR (Anoxic / Oxic+Membrane Biological Reactor) nitrogen and phosphorus removal system. The step-feed multi-stage AO+MBR nitrogen and phosphorus removal system comprises a multi-stage AO biological reaction tank constructed by an anaerobic tank, a first-stage anoxic zone, a first-stage aerobic zone, a second-stage anoxic zone, a second-stage aerobic zone, a third-stage anoxic zone, a third-stage aerobic zone, a fourth-stage anoxic zone and a fourth-stage aerobic zone which are communicated in sequence, and an MBR tank, wherein sewage injection ports of the anaerobic tank, each of the second-stage anoxic zone, the third-stage anoxic zone and the fourth-stage anoxic zone is connected with a sewage inflow pipe through an electric sewage regulating valve and a sewage flow meter arranged on a water inlet pipeline; each stage of aeration pipeline of each of the first-stage aerobic zone, the second-stage aerobic zone, the third-stage aerobic zone and the fourth-stage aerobic zone is connected with a main air pipe through an electric air regulating valve; a dissolved oxygen concentration determination probe is arranged at the tail end of each of the first-stage aerobic zone, the second-stage aerobic zone, the third-stage aerobic zone and the fourth-stage aerobic zone; the MBR tank is provided with a sewage outflow port and a sludge outlet; and the sludge outlet is connected with the sludge injection port of the anaerobic tank. The nitrogen and phosphorus removal efficiencies of the system are increased.

Description

technical field [0001] The invention relates to a nitrogen and phosphorus removal system, in particular to a segmented water-inflow multi-stage AO+MBR nitrogen and phosphorus removal system combined with a membrane bioreactor. Background technique [0002] With the improvement of national requirements for effluent standards, the MBR (membrane biological reactor, membrane bioreactor) process has been widely used in sewage treatment projects in recent years, and has become a research hotspot in sewage biological treatment processes. MBR is a process that combines membrane separation technology with traditional biological treatment. Membrane separation is used to replace the secondary settling tank in the traditional activated sludge method. On the one hand, the traditional gravity separation process occupies a large area and the effluent quality is unstable. The MBR process can greatly save the land used in the sedimentation tank and improve the effluent effect; in addition, t...

AI Technical Summary

Problems solved by technology

It can be seen from the flow chart that in order to maintain the sludge concentration and denitrification requirements of each section, the system needs to set up 700% internal reflux, which increases energy consumption considerably

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