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| Enhanced nitrogen removal and anti-fouling behaviours in anoxic/oxic electrochemical membrane bioreactor |
| YAN Kai-li, ZHENG Jun-jian, WANG Zhi-wei, WU Zhi-chao |
| School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract The pollutant removal efficiency and anti-fouling behaviours of electrochemical A/O-MBR under external electric field were studied, and the mechanisms for membrane fouling mitigation were analyzed. The results showed that the average removal efficiency of COD and Total Nitrogen (TN) for the A/O-MBR with 2V electric field (EMBR) were 89.4%, 92.2%, and 87.6%, 77.3% for the A/O-MBR without electric field (CMBR), respectively, indicating that the use of external voltage can improve the nitrogen removal of A/O-MBR significantly. It was also found that the average operating cycle for the membrane with 2V electric field was 38days, which was longer than the membrane without voltage (26days on average). The enhanced electrostatic repulsive force between foulants and membrane and the in-situ cleaning of H2O2 were the main reasons for anti-fouling ability improvement.
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Received: 06 March 2016
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