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| Partial nitritation-Anammox process treating magnetic coagulation domestic sewage |
| DI Fei1,2, SUI Qian-wen1, CHEN Yan-lin1, XU Dong-yao2, WEI Yuan-song1,3 |
1. Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
2. School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, Beijing 100089, China;
3. Institute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China |
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Abstract Two-stage partial nitrification and anammox process was used to treat magnetic coagulation domestic sewage. Through regulating aeration and bioaugmentation, partial nitritation of magnetic coagulation sewage was achieved, and advanced nitrogen removal was proceeded by coupling anammox reaction. The 100days' operational results showed that controlling intermittent aeration and bioaugmentation, nitrite accumulation rate reached 89.93%. Further increasing in DO from 0.6~0.8 to 1.0~1.2mg/L was beneficial to enhance ammonia and TN removal efficiencies. The system removed up to 95.45% of ammonia nitrogen and 86.28% of total nitrogen, and achieved stable and efficient nitrogen removal. During the treatment of magnetic coagulation pretreated sewage in the partial-nitritation reactor, the residual dissolved organic matter was used to provide carbon source for denitrification under intermittent aeration. COD removal efficiencies of the combined process achieved 64.65%~74.42%. The organic components in the effluent of partial- nitritation reactor and the final effluent of the system were similar, mainly refractory organics.
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Received: 24 March 2020
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