纳米零价铁投加对缺氧/好氧膜生物反应器膜污染的潜在影响。
Potential effects of loading nano zero valent iron discharged on membrane fouling in an anoxic/oxic membrane bioreactor.
机构信息
State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology, Shenzhen Key Laboratory of Drinking Water Source Safety Control, Shenzhen Key Laboratory of Emerging Contaminants Detection & Control in Water Environment, Shenzhen Academy of Environmental Sciences, Guangdong Shenzhen 518001, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Department of Civil and Environmental Engineering, University of Auckland, Auckland 1142, New Zealand.
出版信息
Water Res. 2017 Mar 15;111:140-146. doi: 10.1016/j.watres.2017.01.007. Epub 2017 Jan 3.
A laboratory-scale submerged anoxic-oxic membrane bioreactor for municipal wastewater was operated to investigate the potential effects of loading suspended nano zero valent iron (nZVI, 25 and 50 mg/L) discharged on the membrane fouling. nZVI transformed rapidly into Fe, generated reactive oxygen species (ROS) and caused oxidative stress. This result rapidly led to the cell lysis and bacteria death, and further resulted in the decrease of biomass and extracellular polymeric substances (EPS). nZVI also thinned the membrane fouling layer. But nZVI had no obvious effects on activated sludge particle size, EPS molecule weight distribution and VOCs constitution of membrane foulant. Additionally, nZVI released Fe and mitigated the inorganic (mainly Si element) fouling through Fe flocculation. Consequently, membrane fouling mitigation with nZVI discharged was mainly due to oxidative stress to bacteria and Fe flocculation of nZVI.
采用实验室规模的淹没式缺氧好氧膜生物反应器处理城市污水，研究了排放的悬浮纳米零价铁（nZVI，25 和 50mg/L）对膜污染的潜在影响。nZVI 迅速转化为 Fe，产生活性氧（ROS）并导致氧化应激。这一结果迅速导致细胞裂解和细菌死亡，进一步导致生物量和胞外聚合物（EPS）的减少。nZVI 还使膜污染层变薄。但 nZVI 对活性污泥粒径、EPS 分子量分布和膜污染物中挥发性有机化合物（VOCs）组成没有明显影响。此外，nZVI 释放的 Fe 通过 Fe 絮凝减轻了无机（主要是 Si 元素）污染。因此，nZVI 排放的膜污染缓解主要归因于细菌的氧化应激和 nZVI 的 Fe 絮凝。
Zotero 插件