Membrane Science and Technology

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Diatomite filter-aid ultrafiltration, method to reduce membrane fouling on the basis of microparticle auxiliary filtration principle

Authors： Su Xuemei, Wu Chunrui, Lu Xiaolong*, Wang Xuan, Jia Yue, Chen Huayan, Gao Qijun

Units： State Key Laboratory of Hollow Fiber Membrane Materials and Membrane Processes,

KeyWords： membrane fouling; ultrafiltration; filter-aid; membrane flux

ClassificationCode：TM 344.1

year,volume(issue):pagination： 2013, 33(4):68-72

Abstract：

A novel process was constructed on the basis of micro-particle auxiliary filtration principle. Diatomite was added into the feed solution and a loose cake layer was formed on membrane surface, which could prevent contaminant from adhering on the membrane surface directly and forming a dense cake layer. Both of the membrane and diatomite particles could be regenerated by periodic gas-liquid mixed cleaning with the aim to limit membrane fouling. The effects of the size and dosage of the diatomite on the performance of the process were studied. The results showed that the particle size and dosage of the diatomite had a tight relation with the filter-aid efficiency to reduce membrane fouling during UF process. The addition of the proper amount diatomite with bigger particle could decrease the filtration resistance and 2.0g/L diatomite with the size of 35μm is the optimum value for this experiment. The relative flux increased 9% and the flux recovery rate enhanced 8% compared with UF process without diatomite.

Funds：

国家自然科学基金（21106100, 21176188），教育部博士点基金（20111201110004），天津市应用基础及前沿技术研究计划（11JCYBJC04700，12JCQNJC05500）

AuthorIntro：

苏雪梅（1988-），女，天津，硕士生，主要从事膜法水处理技术研究，E-mail：yoya_22@yahoo.cn 通讯联系人，吕晓龙(1964-)，教授，主要从事中空纤维膜材料与膜过程研究，E-mail: luxiaolong@263.net

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