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The main features of the performance of detergent wastewater major pollutants in wastewater are anionic surfactants LAS, high concentrations of LAS wastewater microbial cell viability and proliferation of certain impediment. Thus, the difficulty of such biodegradable waste water increased. Waste water is alkaline, pH value is usually in 9-12. In addition, the lack of water in the synthesis of microbial cytoplasmic essential nitrogen element. It is determined by the physico-chemical and biological treatment using a combination of the process according to the characteristics of the wastewater sub-category. Physico-chemical treatment by coagulation sedimentation, biological treatment using hydrolysis acidification and contact oxidation. Follow-up to enter the anaerobic tank (pool acid hydrolysis), dissolved organic matter is absorbed by the microbial cells leaving the effluent BOD concentration decreased; in addition, NH3-N synthesis by cells are removed part of the sewage in the NH3-N concentration, but NO3-N content did not change.
In the aerobic tank, biochemical microbial degradation of organic matter, and continue to decline; organic amide nitrogen is then nitrated to make significant decrease NH3-N concentration, but with the nitrification process so that an increase in the concentration of NO3-N, P with poly excessive intake of phosphorus bacteria, but also a faster rate of decline. So, A2 / O process it can be done at the same time removal of organic matter, excessive intake of denitrification and phosphorus are removed and other functions, provided that denitrification is NH3-N should complete nitrification, aerobic tank can accomplish this function, the lack of nitrogen and oxygen pool complete the function. Combined anaerobic tank and aerobic tank complete Phosphorus.