膜科学与技术

纳滤膜处理脱硫废水过程膜污染特性分析

作者：卢卫，明强，吴琼，杨健，潘杨，李飞，夏庆，周振

单位： 1.华能国际电力江苏能源开发有限公司南通电厂，江苏南通 226003； 2.上海电力大学环境与化学工程学院，上海 201306

关键词：纳滤；脱硫废水；膜污染；膜通量

出版年,卷(期):页码： 2022,42(1):138-144

摘要：

利用纳滤装置对某电厂脱硫废水进行处理，判定主要污染物，研究纳滤膜污染特性。结果表明，在运行过程中，纳滤膜通量前18 h内由69.1 L/(m2h)迅速降低至40.2 L/(m2h)，同时膜脱盐性能衰退，对Ca2+、SO42-和Mg2+的截留率呈现下降趋势。污染膜表面平均粗糙度从5.94 ± 2.13 nm增加至132.7 ± 27.6 nm，接触角从43.5°增加至62.5°。扫描电镜图显示，污染膜表面呈现凹凸不平片状物质和颗粒沉积物；污染层元素分析结果证实，硫酸盐和金属离子形成的沉积物对纳滤膜NF270的结垢贡献较大，主要成分为CaSO4。长期运行过程中，纳滤膜表面形成以无机污染为主，同时存在有机污染的复合污染。

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.

卢卫（1970-），男，上海，助工，本科，电厂工业废水处理

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