Partial nitrification under limited dissolved oxygen conditions |
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| Institution: | 1. Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China;2. State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, PR China;1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;2. China Wuzhou Engineering Group Corporarion LTD, China;1. Karlsruhe Institute of Technology, Engler-Bunte-Institute, Water Chemistry and Water Technology, Engler-Bunte-Ring 1, 76131, Karlsruhe, Germany;2. Karlsruhe Institute of Technology, Institute of Functional Interfaces (IFG), Microbiology of Natural and Technical Interfaces Department, Hermann von Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany;1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China;2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China;3. Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA;1. School of Resources and Environment, University of Jinan, Jinan 250022, PR China;2. School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia;3. Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China;1. School of Environment & Natural Resource, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China;2. Chaoyang District Bureau of Water Resources of Beijing Municipality, No. 1 North Rd, Tuanjiehu, Chaoyang District, Beijing 100026, China;3. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | Partial nitrification to nitrite is technically feasible and economically favourable, especially when wastewaters contained high ammonium concentrations or low C/N ratios. Partial nitrification can be obtained by selectively inhibiting nitrite-oxidizing bacteria (NOB) through appropriate regulation of the pH, temperature and dissolved oxygen (DO) concentrations. The effect of pH, DO levels and temperature on ammonia oxidation rate and nitrite accumulation was investigated in order to determine the optimal conditions for partial nitrification of synthetic wastewater with high ammonia concentration. The experiments performed at low DO levels to lower the total oxygen needed in the nitrification step, which means great saving in aeration. During the start-up stage pH and DO were set at 7.0–7.4 and 0.5 mg/l, respectively. The reactor was operated until complete partial nitrification was achieved. The effect of pH, DO on partial nitrification was studied, as pH was kept at 6.5, 7.5, 8.5, 9.5 and DO at 0.5±0.2, 1.5±0.2 and 2.5±0.2 mg/l, and temperature at 30 °C. The influence of temperature on ka value was studied by keeping pH=7.5, DO=1.5 mg/l and temperature was controlled at 12, 20 and 30 °C, respectively. The results showed that partial nitrification to nitrite was steadily obtained and the optimal operational parameters were pH=7.5, DO=1.5 mg/l, T=30 °C based on ammonia oxidation rate and nitrite accumulation rate. The maximum ka was achieved and to be 115.1×10?3 mg NH4+–N (mg VSS h)?1 under this condition. |
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