School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
CSD New Concept Environmental Development Yixing Co., Ltd, Yixing 214000, China.
Bioresour Technol. 2024 Jul;403:130860. doi: 10.1016/j.biortech.2024.130860. Epub 2024 May 18.
Low-maintenance membrane cleaning is essential for the stable operation of membrane bioreactors. This work proposes an in-situ electrical-cleaning method using an electro-MBR. When the applied bias was transiently increased, the membrane flux recovered rapidly because of the scouring effect from gas evolution reactions. The exfoliation of the cake layer induced by gas scouring played a major role in mitigating membrane fouling, recovering the transmembrane pressure (TMP) by 88.6 % under optimal conditions. Membrane modules did not require replacement during the operation period due to the efficacy of electrical cleaning, with the TMP varying between 37.5 % and 62.5 % of the ultimate pressure requiring change of the membrane modules. Despite the increase in power consumption of 0.66 Wh·m due to the additional applied bias, there was no need for chemical additives or manual maintenance. Therefore, the electrical cleaning method enhanced the service life and reduced the maintenance costs of the electro-MBR.
低维护性的膜清洗对于膜生物反应器的稳定运行至关重要。本工作提出了一种在电-MBR 中使用的原位电清洗方法。当施加的偏压瞬时增加时，由于气体产生反应的冲刷作用，膜通量迅速恢复。气体冲刷引起的滤饼层剥落对缓解膜污染起着重要作用，在最佳条件下，可通过 88.6%的跨膜压力（TMP）恢复。由于电清洗的效果，在运行期间不需要更换膜模块，TMP 变化范围为最终需要更换膜模块的压力的 37.5%至 62.5%。尽管由于额外施加的偏压导致功耗增加了 0.66 Wh·m，但不需要添加化学添加剂或进行人工维护。因此，电清洗方法延长了电-MBR 的使用寿命并降低了维护成本。
