Fabrication of Hydrophobic PVDF Hollow Fiber Membranes for Desalination of Brackish Water through Membrane DistillationChinese Full Text
HOU Deyin1,WANG Jun1,WANG Baoqiang2,SUN Xiangcheng1,LUAN Zhaokun1,REN Xiaojing1 1. State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-environmental Sciences,Chinese Academy of Sciences,Beijing 100085; 2. School of Chemical and Environmental Engineering,China University of Mining ＆ Technology,Beijing 100083
Abstract: The mixture of inorganic salt LiCl and soluble polymer polyethylene glycol （PEG） as non-solvent additive was introduced to fabricate hydrophobic polyvinylidene fluoride （PVDF） hollow fiber membrane by phase inversion process. The membrane exhibited high rejection of inorganic salt solutes and a maximum permeate flux 40. 5 kg/（m2.h） was obtained. During direct contact membrane distillation （DCMD） process,the precipitation of CaCO3 would be formed and clog the hollow fiber inlets with gradual concentration of the feed when natural brackish water was used directly as feed solution,which resulted in a rapid decline of membrane module efficiency. The negative influence of scale deposits could be eliminated by acidification of the feed. The DCMD desalination experiment of acidified brackish water showes that the PVDF membrane had stable permeate flux and the conductivity of the obtained distillate remained below 10 μS/cm during the whole process.
Keywords：
polyvinylidene fluoride; permeate flux; membrane distillation; brackish water; membrane fouling;
- DOI：
10.13209/j.0479-8023.2010.057
- Series：
- Subject：
- Classification Code：
X52
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