膜科学与技术

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Impact from direct electric field on gel-type membrane fouling

Authors： ZHANG Jiao, LI Tianyu, GUAN Jing, HUANG Xia

Units： State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University; THU-Origin Water Joint Research Center for Environmental Membrane Technology, Beijing 100084, China

KeyWords： electric field; membrane fouling; gel layer; supernatant

ClassificationCode：

year,volume(issue):pagination： 2018,38(3):9-15

Abstract：

Development and application of membrane technologies were restricted by fouling. Foulants were majorly negatively charged, thus, electric field could theoretically effectively suppress the formation and evolution of fouling. In this study, membrane-bioreactor supernatant, which contained great amount of foulants to form gel-type fouling during filtration, were adopted as the feed water; and the effect of a direct electric field on both developing and developed fouling layer were investigated respectively. It was observed that the flux during the fouling layer formation increased with the increment of voltage, while specific voltage and time could increase the flux of a fouled membrane. The analysis of the structure and component of the fouling layer illustrated that gel-type fouling layer would be loosen thereby the porosity were increased. But large number of precipitates were observed on the fouled membrane surface due to electrolysis of water under high voltage (15 V), which led to an advanced reduction of flux.

Funds：

科技部国际科技创新合作重点专项（No. 2016YFE0118500）

AuthorIntro：

张姣（1987-），女，山西阳泉人，博士，清华大学环境学院博士后，从事膜法水处理与再生水回用相关研究。E-mail：zhangjiao@tsinghua.edu.cn。*通讯作者，E-mail：xhuang@tsinghua.edu.cn

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