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The studies on the properties of heterogeneous anion exchange membrane fouling causing by octanoic acid in electrodialysis

Authors：

LIU Lu ^{1, 2}, ZHAO Zhijuan^{1, 2}, LI Yao^{1, 3}, SHI Shaoyuan^{1, 2*}, WANG Liying⁴, LI Lin⁴

Units： 1 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing Engineering Research Center of Process Pollution Control, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China 4 Anshan Iron and Steel Group Corporation, Liaoning Anshan, 114021, China

KeyWords： electrodialysis; heterogeneous anion exchange membrane; octanoic acid; membrane fouling property; influence factors

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(1):55-60

Abstract：

Organic fouling of anion exchange membrane is one of the main limiting factors for industrial wastewater desalination by electrodialysis. Octanoic acid, as model foulant, was used to explore the influence of different factors such as organic compound concentration, pH, current density and salt concentration on anion exchange membrane fouling. The properties of heterogeneous anion exchange membrane were characterized by examining the changes of membrane resistance, contact angle, ion exchange capacity before and after fouling. It was found that organic fouling of anion exchange membrane occurred when the concentration of octanoic acid contained in the solution was about 300-400 mg/L, moreover, more higher concentration of octanoic acid could lead to more serious membrane fouling. It was also found that membrane fouling caused by octanoic acid was more serious under the acidic condition, but no membrane fouling appeared at the surface of heterogeneous anion exchange membrane under alkaline condition, moreover, the increase of current density resulted in more serious membrane fouling. In the electrodialysis system with octanoic acid, the organic fouling mainly occurred in the diluted side of heterogeneous anion exchange membrane. The results showed that the membrane fouling caused by octanoic acid could be effectively prevented by means of controlling foulant concentration, pH and current density in the electrodialysis system.

Funds：

国家水体污染控制与治理科技重大专项(2014ZX07201-011-003)、国家自然科学基金(21076214)和北京市自然科学基金(8132047)

AuthorIntro：

第一作者简介：刘璐(1989-), 女, 天津市人，在读硕士生，从事工业废水脱盐研究．*通信作者, E-mail: syshi@ipe.ac.cn

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