Effects of ionic strength on membrane fouling in a membrane bioreactor

被引：32

作者：

Wang, Fangyuan ^{[1
]}

Zhang, Meijia ^{[1
]}

Peng, Wei ^{[1
]}

He, Yiming ^{[2
]}

Lin, Hongjun ^{[1
]}

Chen, Jianrong ^{[1
]}

Hong, Huachang ^{[1
]}

Wang, Aijun ^{[1
]}

Yu, Haiying ^{[1
]}

机构：

[1] Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua 321004, Peoples R China

[2] Zhejiang Normal Univ, Dept Mat Phys, Jinhua 321004, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2014年 / 156卷

基金：

中国国家自然科学基金;

关键词：

Membrane fouling; Membrane bioreactor; Critical ionic strength; Energy barrier; WASTE-WATER TREATMENT; OSMOTIC-PRESSURE; PERMEATE FLUX; PERFORMANCE; FILTRATION; DECLINE; CAKE;

D O I：

10.1016/j.biortech.2014.01.014

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

In this study, the effects of ionic strength on membrane fouling in a membrane bioreactor (MBR) were investigated. Ionic strength in range of 0.005-0.05 mol/L exerted no apparent impacts on the resistance of virgin membrane, fouled membrane and pore clogging. Thermodynamic analysis showed existences of a secondary energy minimum and an energy barrier in the process of the sludge flocs approaching to membrane surface. Increase in ionic strength could significantly reduce the energy barrier. It was revealed that there existed a critical ionic strength above that the energy barrier would disappear, facilitating adhesion of the foulants. Cake resistance was not significantly affected by the ionic strength, but highly depended on SMP in supernatant. The high cake resistance caused by SMP could be explained by the osmotic pressure mechanism. The obtained results provided new insights into membrane fouling in MBRs. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：35 / 41

页数：7

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