Enhanced type efficient nitrogen and phosphorus-removing sewage treatment system and treatment technology

Abstract

The invention relates to an enhanced type efficient nitrogen and phosphorus-removing sewage treatment system. A structure thereof comprises the following units: 1) a biochemical treatment unit, 2) a membrane treatment unit, 3) a backflow unit, 4) filling units and 5) a control unit, wherein the membrane treatment unit is connected with a water outlet end of the biochemical treatment unit; backflowsludge of the membrane treatment unit is connected with a water inlet end of an aerobiotic tank of the biochemical treatment unit, and the backflow rate is 300%-400%; the water outlet end of the aerobiotic tank flows back to the water inlet end of an anoxic tank through a backflow pipeline and a backflow device, the water outlet end of the aerobiotic tank and the water outlet end of an anaerobictank are jointly connected with the anoxic tank, and the backflow rate is 100%-200%; the water outlet end of the anoxic tank flows back to the water inlet end of the anaerobic tank through the backflow pipeline and the backflow device, the water outlet end of the anoxic tank and a pretreated water outlet end are jointly connected with the anaerobic tank, and the backflow rate is 100%-200%; the filling units are arranged in the anoxic tank and the aerobiotic tank. In the invention, a filler is added in a traditional A / A / O technical reactor, the backflow position and the backflow rate are adjusted, the carbon source is efficiently utilized, the nitrogen and phosphorus removal effect is enhanced, the reaction rate is effectively increased and the effluent index can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an enhanced high-efficiency nitrogen and phosphorus removal sewage treatment system and treatment process. Background technique [0002] my country's urban domestic sewage or similar sewage treatment generally adopts integrated equipment. The integrated sewage treatment equipment has a series of advantages such as good effluent quality, high degree of automation, and small footprint. Integrated sewage treatment equipment mainly adopts biological activated sludge method. The typical secondary treatment processes currently formed mainly include traditional activated sludge process, AB process (adsorption-biodegradation process), A / A / O-MBR process (anaerobic-anoxic-aerobic process-membrane biological reaction process). device), A / O-MBR process (anaerobic-aerobic method-membrane bioreactor), A / A / A / O-MBBR process (a variety of two-stage anoxic-moving bed biofilm reaction pr...

AI Technical Summary

Problems solved by technology

However, the A / A / O-MBR process has the following disadvantages: 1. The return sludge contains nitrate, which directly enters the anaerobic tank, which has an impact on anaerobic phosphorus release; 2. The traditional A / A / O process is easy to generate sludge Expansion problem; 3. The traditional A / A / O process is easy to cause sludge floating problem; 4. Denitrification is affected by the internal reflux ratio

However, the A / O-MBR process also has its disadvantages: 1. Using the A / O process, the phosphorus removal efficiency is low; 2. The MBR membrane is placed in an aerobic tank, which has a large amount of aeration and high energy consumption; 3. The membrane tank Returning to the anoxic tank will easily affect the anoxic state in the anoxic tank; 4. Put the MBR membrane in the aerobic tank, and the large amount of aeration will affect the phosphorus removal effect of the aerobic tank

However, the A / A / A / O-MBBR process has the following disadvantages: 1. The traditional sedimentation tank has many structures and occupies a large area; 2. The solid-liquid separation efficiency of the sedimentation tank using the traditional activated sludge method is low, and the sludge Loss, low volume load, large equipment volume, and cannot meet the standard stably; 3. The traditional activated sludge method is prone to sludge bulking, and the impact load resistance and stable operation ability are low

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