Effect of influent nutrient ratios and hydraulic retention time (HRT) on simultaneous phosphorus and nitrogen removal in a two-sludge sequencing batch reactor process |
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| Authors: | Yayi Wang Yongzhen Peng Tom Stephenson |
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| Institution: | 1. State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Siping Road, Shanghai 200092, PR China;2. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100022, PR China;3. Cranfield University, Cranfield, MK43 0AL, UK |
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| Abstract: | A laboratory-scale anaerobic–anoxic/nitrification sequencing batch reactor (A2N-SBR) fed with domestic wastewater was operated to examine the effect of varying ratios of influent COD/P, COD/TN and TN/P on the nutrient removal. With the increased COD/P, the phosphorus removals exhibited an upward trend. The influent TN/P ratios had a positive linear correlation with the phosphorus removal efficiencies, mainly because nitrates act as electron acceptors for the phosphorus uptake in the A2N-SBR. Moreover, it was found that lower COD/TN ratio, e.g. 3.5, did not significantly weaken the phosphorus removal, though the nitrogen removal first decreased greatly. The optimal phosphorus and nitrogen removals of 94% and 91%, respectively were achieved with influent COD/P and COD/TN ratios of 19.9 and 9.9, respectively. Additionally, a real-time control strategy for A2N-SBR can be undertaken based on some characteristic points of pH, redox potential (ORP) and dissolved oxygen (DO) profiles in order to obtain the optimum hydraulic retention time (HRT) and improve the operating reliability. |
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| Keywords: | Sequencing batch reactor (SBR) Anaerobic&ndash anoxic/nitrification (A2N) Denitrifying phosphorus removal organisms (DNPAOs) Nutrient ratios Real-time control |
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