1. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
In order to investigate different anoxic/aerobic ratio on stability of partial nitritation (PN), continuous flow reactor was used at room temperature (22~25℃). After complete nitritation (CN) was achieved through controlling FA and DO (0.3~0.5mg/L), the effluent of Anaerobic/Oxic(A/O) process removing phosphorous wastewater was used as influent to CN. Then, CN turned to PN gradually. The influence of different anoxic/aerobic volume ratios (0:1,1:1,2:1,3:1) on stability of PN was investigated. It demonstrated that PN was difficult to mantain when treating domestic sewage containing low ammonia nitrogen (40~70mg/L) at the ratio of 0:1.However, stable PN could be maintained when the ratios were 1:1, 2:1 and 3:1. The ratio of 3:1 was more efficient than the others. In the process of 0:1, 1:1, 2:1 and 3:1, ammonia utilization rate increased by 29.57%、44.27%、45.23%、49.63%, respectively. During the whole operating period, the settleability of sludge was good with volume Index (SVI) being 65~130mL/g.
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