Nitrogen and phosphorus removal technology having functions of preventing and controlling biological floating foam

Abstract

The invention discloses a nitrogen and phosphorus removal technology having functions of preventing and controlling biological floating foam. The technology is characterized in that: sewage is diverted and flows into a first anaerobic tank and a second anaerobic tank; the sewage flowed into the first anaerobic tank is mixed and reacted in the first anaerobic tank with returned sludge returned from a second precipitation tank; mixed liquid discharged from the first anaerobic tank flows into a first aerobic tank to be subjected to an aerobic reaction; water discharged from the first aerobic tank flows into the second anaerobic tank, and is subjected to a denitrification reaction in the second anaerobic tank with the sewage flowed into the second anaerobic tank; water discharged from the second anaerobic tank flows into a second aerobic tank; mixed liquid discharged from the second aerobic tank flows into a degasification system to degasify nitrogen; the degasified mixed liquid flows into a second precipitation tank to separate water and mud; and a portion of the sludge at the bottom of the second precipitation tank returns to the first anaerobic tank. By improving precipitating performances of active sludge through the degasification system, the technology is capable of maintaining a high sludge content in the system, improving the sewage treatment efficiency, effectively preventing and controlling biological floating foam common in sewage treatment works, and reducing the suspension solid content in the water discharged from the second precipitation tank.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a nitrogen and phosphorus removal process with the function of biological foam prevention and control. Background technique [0002] There are many processes for denitrification and phosphorus removal of sewage in my country, mainly three series of processes including A / A / O, oxidation ditch and SBR, among which the A / A / O series process has become a The preferred process for the construction of large sewage treatment plants. [0003] The A / A / O series process is widely used and has various forms. The common ones are A / A / O, inverted A / A / O, improved A / A / O, Bardenpho, Joburg process, UCT, MUCT, multi-stage A / O craft etc. Among them, the multi-stage A / O process has a high sludge concentration in the front stage of the process due to the water inflow at different points, which improves the reaction rate of the system, and can complete the removal of polluta...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a nitrogen and phosphorus removal process with the function of biological foam prevention and control, which has the advantages of saving construction land, low operating energy consumption, good sludge settlement effect, stable and high-quality effluent water quality, so as to solve the problem of land occupation of sewage treatment plants. Problems such as large area and unstable mud-water separation effect

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