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| The start-up and performance of denitrifying phosphorus removal process in a post-anoxic SBR system |
| ANG Jie1, LI Dong1, LUO Ya-hong2, LI Xiao-ying1, ZENG Hui-ping1, ZHANG Jie1,3 |
1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, College of the Environment, Henan Normal University, Xinxiang 453007, China;
3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract In order to realize efficient simultaneous nitrogen and phosphorus removal in domestic wastewater, a post-anoxic SBR system was used. The results showed that the denitrifying phosphorus removal process was launched in 39days by firstly shortening the SRT to enrich phosphorus accumulating organisms (PAOs), and then extending the SRT and introducing the anoxic phase. COD, TP, NH4+-N and TN removal efficiency were 92.9%, 98.4%, 100% and 98.4%, respectively. The effect of influent carbon-nitrogen ratio (C/N) was also investigated. There was no obvious change on nitrogen and phosphorus removal efficiency when the decrease of C/N was below 17.65% in a short term. When it exceeded 33.3%, the system had a bad performance on both nitrogen and phosphorus removal, but in the long run, the effluent COD concentration fell, and the proportion of denitrifying phosphorus accumulating organisms (DPAOs) in PAOs increased, which supplemented the removal efficiency of decline to some extent. The cycle test indicated that pH and DO can be the real-time control parameters which decided whether the anaerobic phosphorus release and the cycle ended or not. The reaction time and energy consumption of aeration could be reduced significantly.
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Received: 12 October 2015
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