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| New process for phosphorus removal with the combination of biological medium addition and calcium hydroxyphosphate crystallization |
| WANG Dong-hao1,2, ZHENG Ping1, QIU Lin1, DENG Zheng-dong2 |
1. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China;
2. College of Defense Engineering, The Army Engineering University of PLA. & Tech, Nanjing 210007, China |
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Abstract Anaerobic granular sludge was introduced to phosphorus removal system, creating a new process for phosphorus removal with the combination of biological medium addition and calcium hydroxyphosphate crystallization. The effects of pH, Ca/P ratio, HRT on the performance of new process were investigated to optimize process parameters. The results demonstrated that the optimal parameters were pH=12, Ca/P=3.34 (mole ratio), HRT=60min for synthetic wastewater with phosphorus concentration of 30mg/L. Under the optimal condition, phosphorus removal efficiency was 99.81% and the effluent phosphorus concentration was 0.057mg/L. The new process was operated for the phosphorus removal from piggery wastewater, which phosphorus removal efficiency was 85.85% and the effluent phosphorus concentration was 4.67mg/L.The phosphorus was enriched in the product, especially in the top and central part of reactor. The phosphorus of product mainly existed in the form of hydroxyapatite and its content by P2O5 was 37. 68% and 36.57% respectively, which has reached the standard of high quality phosphate rock and has a high value for phosphorus reuse.
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Received: 05 April 2017
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