A pilot-scale modified SBR process was studied to treat domestic wastewater. Experimental results show that the average NH3-N removal ratio reached 94％, the average TN removal ratio reached 52％, the average TP removal ratio reached 80％. The effluent NH3-N concentration was less than 1 mg/L, the effluent TN concentration was less than 20 mg/L, and the phosphorus concentration in the final effluent was below 1 mg/L and obtained on 88％ of the days of operation. The ratio of influent NH3-N/TN is equal approximately to TN removal ratio. The organic nitrogen removal is only a little. The TN removal ratio is decided by influent NH3-N concentration mostly. The increasing anaerobic time is advantageous for nitrogen removal, but the increasing rate of TN removal would become slower after anaerobic time is more than 45 minutes. The optimal TN removal efficiency can be prejudged by the influent NH3-N/TN ratio. Longer aerobic time is disadvantageous for nitrogen removal when the ratio of aerobic time/anaerobic time is over 0.5.
a new modified SBR nitrogen removal municipal wastewater
Jun Li Yan Zhang Tao Tao Tong Li Bei-ping Zhang Xin-ping Zhou Xue-bin Li Shu-hui Li Yan-li Wang Qiang Li
School of Environmental Science and Engineering, Huazhong University of Science & Technology Wuhan, Urban construction institute, Wuhan University of Science and Technology, Zhongnan Branch, Wuhan, 43 Tao Tao School of Environmental Science and Engineering, Huazhong University of Science & Technology Nantong Vocational & Technical Shipping College Nantong, 226006, China Wuhan Construction & Installation Engineering Co., LTD. Wuhan, 430010, China Wuhan Kaidi Water Service Co., LTD. Wuhan, 430074, China