Biological nutrient removal for combine treat fecal sewage in Datansha Sewage Treatment Plant
大坦沙污水厂承接粪便污水的脱氮除磷研究

The A2/O process used to treat urban sewage combined with the fecal sewage was investigated in Datansha Sewage Treatment Plant in Guangzhou. Fecal sewage contained higher concentration of contaminants and non-steady influent flow and thus brought about unfavorable influence to the operation of this plant. The practical results showed that the better efficiency can be achieved through adjusting the operating procedures, including the control of DO level in the oxygen consuming tank, extending the hydraulic resident time, increasing the ratio of recycle, enhancing the MLSS and the sludge resident time, etc. After the application of these improvements, it can get better removal efficiency of nitrogen and phosphorus simultaneously. Besides, the COD, NH3-N, TN and TP in the effluent become lower than the discharge standard of pollutants for municipal wastewater.