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Basic studies on the performance of domestic nanofiltration membranes for desalting brackish water with high fluoride

Authors： XU Lu1,2, JIANG Wenli1,2, WANG Jian1,2, GAO Xueli1,2*

Units： 1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China；2.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

KeyWords： domesticnanofiltration membrane; defluorination; desalination of brackish water

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(1):108-114

Abstract：

In this study,the performances of two domestic NF membranes (NF2A and NF3A) for defluorinating brackish water with high fluoride were studiedand compared.And the influences of pressure, temperature, pH,fluoride concentration, total dissolved solids and running time were studied by a pilot unit test.And the Zeta potential of the two NF membranes was detected.Then the optimum condition was identified as followings: Pressure 1.0-1.5MPa, Temperature 20℃, pH=6.5.Under this condition,the desalination rate, the defluorination rate and the water flux of NF3A membrane was 79%, 90% and 53 L·m-2·h-1, while that of the NF2A membrane was 73%,73% and 71L·m-2·h-1, respectively.And as a result of the increasing of fluoride concentration and TDS, the defluorination ratedecreased. Meanwhile,the results of long-term operation (72h) showed that the permeability of the membrane remained stable. Finally, the Zeta potential of NF3A and NF2A was -22 and -18 mV. This research will provide technical references to the practical application of domestic NF membranes in the treatment of brackish water, and promote and improve the development of domestic NF membranes.

Funds：

高通量纳滤膜材料的规模化制备技术(2012AA03A602)；MBR-NF处理世园会园区污水回用技术(12-1-3-56-nsh)

AuthorIntro：

胥璐，1990年，女，山东省莱芜市，硕士研究生，纳滤膜水处理。通讯作者：E-mail: gxl_ouc@126.com

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