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Thermodynamics study of the separation process of nanofiltration membrane in pure water system

Authors： YANG Hong1，YE Chunsong2，ZHANG Huiqin3，WANG Jianhua1，XU Wei1

Units： 1. CSIC Environmental Engineering Co. Ltd, Wuhan 430064, China; 2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China; 3. Hubei University of technology, Wuhan 430068, China

KeyWords： NF membrane; Thermodynamics; Pure water system

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2014,34(5):79-83

Abstract：

The two nanofiltration (NF) membranes, NF 270 and GE DK, were tested for the filtration processin pure water system at different temperatures, operating pressures and pH for water. The fluxes of two NF membranes were determined, and the variations of pure water permeability coefficient of NF membranes were discussed. The relationship between pure water permeability coefficient of NF membranes and thermodynamic parameters were conducted and the thermodynamic parameters of two types of NF membranes were calculated. Following that, the principle of the filtration process of NF membrane was discussed. The experimental results show that the fluxes of two NF membranes increased with increasing the temperature and operating pressure. The pure water permeability coefficient of both NF membranes also increased with increasing the temperature and fluctuated within a narrow range regardless of operating pressure and pH for water. The activation energy of GE DK membrane is higher than that of NF 270membrane, 16.56KJ/mol and 14.22 KJ/mol, respectively, indicating that GE DK membrane requires more energy to run than NF 270 membrane.

Funds：

国家创新基金项目

AuthorIntro：

阳红（1980-），男，湖北武汉人，博士，中船重工环境工程有限公司，工程师，水处理及污泥资源家技术，

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