期刊
JOURNAL OF MEMBRANE SCIENCE
卷 376, 期 1-2, 页码 247-253出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.04.035
关键词
Membrane fouling; Humic acid; Aggregation; Chelator; Backwashing
资金
- MEXT, Japan
- Ministry of Environment, Japan [K22038]
Ultrafiltration using a hollow fiber membrane is increasingly used in water treatment for the removal of particles, turbidity and microorganisms to meet stringent water quality requirements. Fouling by natural organic matter (e.g. humic acid and fulvic acid) is a critical problem in membrane processes. In this work, experiments were performed to evaluate the effects of metal ions on humic acid fouling of a hollow fiber ultrafiltration membrane. Fouling was severe in the presence of metal ions, especially at high concentration of Ca2+ or Fe3+. The accelerated fouling is considered to be due to the formation of intermolecular crosslinking between humic acid molecules, because the humic acid aggregate size increased in the presence of Ca2+. Addition of ethylendiaminetetraacetic acid (EDTA) decomposed the aggregates and prevented metal ion-induced acceleration of fouling. Scanning electron micrograph images clearly revealed deposition of humic acid on the membrane after filtration, and that the presence of metal ions increased humic acid deposition, which led to accelerated fouling. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据