Study of operational conditions of simultaneous nitrification and denitrification in a Carrousel oxidation ditch for domestic wastewater treatment |
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| Authors: | Yanchen Liu Hanchang Shi Lan Xia Huiming Shi Tonggang Shen Zhiqiang Wang Gan Wang Yingzhe Wang |
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| Institution: | aState Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;bGuozhen Environmental Protection Company, Hefei 230088, China;cSchool of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China |
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| Abstract: | The study on the operational conditions of simultaneous nitrification and denitrification (SND) in the channel of oxidation ditch (OD) without the need for a special anoxic tank was carried out based on lab-scale and pilot-scale experiments using real domestic wastewater. The influence of sludge loading and component proportion in influent, temperature, hydraulic retention time (HRT), dissolved oxygen (DO) and operational mode on SND was investigated. The result indicated that the optimal DO (ODO) of SND occurrence was confirmed majorly by the sludge loading of influent and temperature, the high TCOD/NH3–N and short HRT can enhance the occurrence of SND. A new operational mode was proposed that achieved a higher removal efficiency of 60–70% for total nitrogen by SND with HRT of 4–6 h, and the concentrations of NH3–N and TN in effluent are less than 5 and 15 mg/L, respectively. |
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| Keywords: | Simultaneous nitrification and denitrification Carrousel oxidation ditch Wastewater treatment |
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