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Analysis of membrane fouling properties in flue gas desulfurization wastewater treatment by nanofiltration membrane

Authors： Lu Wei，Ming Qiang，Wu Qiong，Yang Jian，Pan Yang，Li Fei，Xia Qing，Zhou Zhen

Units： 1. Nantong Power Plant, Huaneng International Power Jiangsu Energy Development Co., Ltd., Nantong 226003, China; 2. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 201306, China

KeyWords： nanofiltration; flue gas desulfurization wastewater; membrane fouling; membrane flux

ClassificationCode：X703

year,volume(issue):pagination： 2022,42(1):138-144

Abstract：

The flue gas desulfurization wastewater of a power plant was treated by nanofiltration (NF) membrane. The main foulants were determined and the fouling properties of NF membrane were studied. It has been found that membrane flux decreased rapidly from 69.1 L/(m2h) to 40.2 L/(m2h) within 18 hours. Meanwhile, the membrane desalination performance deteriorated, and the rejection rates of Ca2+, SO42- and Mg2+ declined during operation. The average surface roughness of NF membrane increased from 5.94 ± 2.13 nm to 132.7 ± 27.6 nm and the contact angle increased from 43.5° to 62.5° after fouling. Scanning electron microscope (SEM) images showed that flaky and granular foulants appeared on the surface of the fouled membrane. The results of elemental analysis of fouling layer confirmed that the deposits formed by sulfate and metal ions contributed significantly to the fouling of NF270, and the main foulant was CaSO4. In the long-term operation process, NF membrane suffered both organic and inorganic fouling, and inorganic fouling dominated the fouling process.

Funds：

上海市曙光计划项目(19SG49)；中国华能集团有限公司“污泥/固废特性分析与污泥资源化关键技术”（HNKJ19-G02）；上海市青年科技英才扬帆计划（21YF1414900）。

AuthorIntro：

卢卫（1970-），男，上海，助工，本科，电厂工业废水处理

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