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| Influence of pulsed flow fluctuation on UASB reactor of anaerobic ammonia oxidation |
| GAO Meng-jia1, WANG Shu-ying1, WANG Shan-yun2, PENG Yong-zhen1, JIA Fang-xu1 |
1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract Due to the fluctuation of upstream sewage during the actual operation, the effect of pulsed inflow shock on the stability of anaerobic ammonium oxidation (ANAMMOX) process was evaluated in the present study through changing the amplitude and frequency of pulsed inflow. The results showed that the ANAMMOX process in UASB reactor had a good adaptivity and tolerance towards pulsed inflow when the amplitude was less than 60mL/min(vupflow=1.33cm/min). Even through the pulsed frequency came to a high level, the effluent could meet the national 1-A standard. The removal efficiency ratio of NH4+-N and NO2--N could both been kept above 80% and the removal ratio of total nitrogen was above 70%. The process of ANAMMOX in UASB reactor was unstable when the pulsed amplitude came to 100mL/min (vupflow=2.22cm/min). With the enhancement of pulsed frequency, the adaptation time of ANAMMOX process increased. The concentrations of NH4+-N and NO2--N in effluent were both above 5mg/L when the pulsed frequency came to 1.5h. Moreover, when the pulsed amplitude increased from 40mL/min to 60mL/min and 100mL/min, the abundance of anammox bacteria in reactor and the percentage of anammox on total bacteria firstly increased and then decreased. The abundance and percentage of anammox bacteria in total bacteria came to the highest level when the pulsed amplitude came to 60mL/min. The reason might be that the mixture and contaction of the anammox and the substance were more efficient, which facilited the growth of anammox bacteria.
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Received: 30 December 2015
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