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| Achieving stable partial nitrification in SBR at ambient temperature |
| ZHANG Min1, JIANG Ying1, WEN Jing-yu1, WANG Yao-qi1, CHEN Chong-jun1,2,3,4, SHEN Yao-liang1,2,3 |
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China;
3. Jiangsu Key Laboratory of Environmental Science and Engineering, Suzhou 215009, China;
4. Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China |
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Abstract The SBR reactor was used to establish a strategy of stabilizing partial nitrification by controlling the stopping point of aeration through a specific pH final value. The whole operation process was divided into 3phases, which were phase I starting nitrosation, phase Ⅱ exploring the setting rule of the pH final value while stabilizing the nitrosation and phase Ⅲ adopting the setting rule of pH final value to achieve stable partial nitrification. Across the summer and the winter (7~35℃) operation of a total of 148days, the transformation of organic matter and nitrogen in the SBR system was investigated and the effects of different temperatures (23, 18, 13℃) on partial nitrosation were analyzed. The results showed that under low DO concentratin (0.2~0.4mg/L) and MLSS of 4000mg/L, the NO2--N/NH4+-N value of the effluent was between 1and 1.4during stabilizing partial nitrification,and by controlling the pH final value which was (7.73±0.02), the effluent FA reached 0.5~1.2mg/L, the accumulation rate of nitrosation (NAR) was maintained at 85% and the removal rate of organic matter was above 60%. Specific ammonia oxidation rate, specific nitrite oxidation rate and specific organic matter removal rate declined with the drop of temperature, but the decreasing trend was slow and the reaction could be completed stably.
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Received: 07 May 2018
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