School of Life Science, Liaoning Normal University, Dalian 116081, China.
School of Life Science, Liaoning Normal University, Dalian 116081, China.
Bioresour Technol. 2019 Jun;282:56-62. doi: 10.1016/j.biortech.2019.02.113. Epub 2019 Feb 25.
The impacts of electric field applied in MBR (EMBR) for treating phenol wastewater and membrane antifouling mechanism were systematically investigated. Phenol degradation rate increased from 0 to 0.8 V/cm, while decreased from 0.8 to 1.75 V/cm, which significantly positively correlated with key enzymes. The membrane fouling rate of EMBR gradually slowed down with voltage increasing. The applied voltage significantly reduced EPS contents, and altered its compositions probably due to HO oxidation, which were the major reasons for membrane antifouling. Red shift in UV-Vis spectrum at 210-220 nm and reduction of fluorescence emission intensity from tryptophan protein-like substances in EPS reduced the energy requirement for electrons transition of electron-donating groups with voltage increasing. Positively charged bond NH decreased and negatively charged bond COO increased in EPS with voltage increasing, which led to the increase of absolute value of zeta potential and then remarkable augmented of electrostatic repulsion between sludge and membrane.
系统研究了电场在 MBR（EMBR）中处理含酚废水和膜污染防治机制中的影响。施加电场后，苯酚降解率从 0 增加到 0.8 V/cm，然后从 0.8 V/cm 降低到 1.75 V/cm，这与关键酶呈显著正相关。随着电压的增加，EMBR 的膜污染速率逐渐减慢。施加电压显著降低了 EPS 含量，并改变了其组成，这可能是由于 HO 氧化所致，这是膜防污的主要原因。随着电压的增加，EPS 在 UV-Vis 光谱中在 210-220nm 处出现红移，并且 EPS 中色氨酸蛋白样物质的荧光发射强度降低，这降低了供电子基团电子跃迁的能量需求。EPS 中的正电荷键 NH 减少，负电荷键 COO 增加，这导致了 zeta 电位的绝对值增加，从而在污泥和膜之间产生了显著的静电排斥。
