Tubular membrane and rear anoxic endogenous denitrification combined nitrogen and phosphorous deep removal device

Abstract

A tubular membrane and rear anoxic endogenous denitrification combined nitrogen and phosphorous deep removal device belongs to the technical field of biological sewage treatment. According to the tubular membrane and rear anoxic endogenous denitrification combined nitrogen and phosphorous deep removal device, domestic sewage enters into the anaerobic section of an AOA (anaerobic / aerobic / anoxic) reactor via a raw sewage tank, glycogen accumulating organisms and polyphosphate accumulating organisms in the anaerobic section can fully absorb and convert external carbon sources in raw sewage into an internal carbon source (PHA, polyhydroxyalkanoates) which is stored in cells, and meanwhile, the polyphosphate accumulating organisms perform anaerobic phosphorous release; then mixed solution is pushed into an aerobic section of nitrification, and polyphosphate accumulating organisms in active silt perform aerobic phosphorous absorption to complete phosphorous absorption; then the mixed solution is pushed into the anoxic section, the glycogen accumulating organisms and the polyphosphate accumulating organisms perform endogenous denitrification on nitrate nitrogen; lastly, the mixed solutionis pushed into a tubular membrane system for slit-water separation, filtered water serves as final effluent for discharging, slit is returned to the anaerobic section and the anoxic section of the AOA reactor. According to the tubular membrane and rear anoxic endogenous denitrification combined nitrogen and phosphorous deep removal device, the anoxic section is arranged at the rear to make full use of the internal carbon source for denitrification nitrogen removal; the tubular membrane system solves the problem of large silt reflux amount, different silt-water separation and the like.

Description

technical field [0001] The invention relates to a continuous-flow device for deep denitrification and dephosphorization of tubular membrane combined with anoxic endogenous denitrification, which belongs to the field of sewage treatment. Background technique [0002] When the traditional anaerobic-anoxic-aerobic process treats domestic sewage, nitrifying bacteria carry out nitrification reaction under aerobic conditions, that is, ammonia nitrogen is oxidized to nitrite and nitrate nitrogen, and denitrifying bacteria use the carbon source in domestic sewage under anoxic conditions Carry out denitrification, that is, nitrous and nitrate nitrogen are reduced to nitrogen, and then nitrogen in domestic sewage is removed. Biological phosphorus removal is achieved by alternating anaerobic phosphorus release and aerobic phosphorus uptake, and by discharging phosphorus-containing sludge. Due to the competition of carbon sources between phosphorus accumulating bacteria and denitrifyin...

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Problems solved by technology

[0007] Aiming at the problems of traditional nitrogen and phosphorus removal, waste of carbon sources and difficulty in separating mud and water

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