Wen Xianghua, Sui Pengzhe, Huang Xia
Department of Environmental Science and Engineering, State Key Joint Laboratory of Environment Simulation & Pollution Control, Tsinghua University, Beijing, 100084, PR China.
Water Sci Technol. 2008;57(5):773-9. doi: 10.2166/wst.2008.120.
In this study, ultrasound was applied to control membrane fouling development online in an anaerobic membrane bioreactor (AMBR). Experimental results showed that membrane fouling could be controlled effectively by ultrasound although membrane damage may occur under some operational conditions. Based upon the observation on the damaged membrane surface via SEM, two mechanisms causing membrane damage by exerting ultrasound are inferred as micro particle collide on the membrane surface and chemical interaction between membrane materials and hydroxyl radicals produced by acoustic cavitations. Not only membrane damage but also membrane fouling control and membrane fouling cleaning were resulted from these mechanisms. Properly selecting ultrasonic intensity and working time, and keeping a certain thickness of cake layer on membrane surface could be effective ways to protect membrane against damage.
在本研究中，超声被应用于在线控制厌氧膜生物反应器（AMBR）中的膜污染发展。实验结果表明，尽管在某些操作条件下可能会发生膜损伤，但超声能够有效地控制膜污染。基于通过扫描电子显微镜（SEM）对受损膜表面的观察，推断出施加超声导致膜损伤的两种机制，即微粒在膜表面碰撞以及膜材料与声空化产生的羟基自由基之间的化学相互作用。这些机制不仅导致了膜损伤，还产生了膜污染控制和膜污染清洗的效果。适当选择超声强度和工作时间，以及在膜表面保持一定厚度的滤饼层，可能是保护膜免受损伤的有效方法。
