生物污染
膜
结垢
电阻器
电容器
材料科学
膜蒸馏
电极
膜污染
化学工程
焦耳加热
导电体
电场
纳米技术
化学
电压
复合材料
电气工程
海水淡化
工程类
物理
量子力学
物理化学
生物化学
作者
Longjie Jiang,Lin Chen,Liang Zhu
标识
DOI:10.1016/j.watres.2019.06.015
摘要
This study evaluated the anti-biofouling efficacy of capacitor mode and resistor mode in membrane distillation (MD). Polytetrafluoroethylene (PTFE) membrane coated with carbon nanotube (CNT) was adopted as the electrically conductive membrane. The biofouling formation on the pre-treatment membrane was systematically analyzed, and the results showed that both operation modes had obvious inhabitation on bacteria, especially the capacitor mode exhibited stronger prevention capability on biomass accumulation than resistor mode. NMDs analysis of microbial communities further revealed that the anti-biofouling effect mainly occurred on the membrane surface, and gram-positive biomarkers which can survive better in external electric field was distinctively found in capacitor mode through LEfSE analysis. Hypothesis was introduced to explain the anti-fouling function of two modes that in the capacitor mode, the competitive electrostatic repulsion of bacteria cells on negative electrode associated by the cell-disruption effect of electro-catalyzed reactive oxygen species (ROS) generation, while the anti-fouling function of resistor mode was a result of temperature increment on membrane surface caused by Joule heating effects. This article attempts to provide an insight of anti-fouling mechanism of electric field applied in MD and to prove the feasibility of above-mentioned operation modes as non-chemical methods for optimization of membrane-based water treatment process.
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