Fluoride removal from brackish groundwater by direct contact membrane distillation

The direct contact membrane distillation applied for fluoride removal from brackish groundwater was investigated. The self-prepared polyvinylidene fluoride membrane exhibited high rejection of inorganic salt solutes. The maximum permeate flux 35.6 kg/（m^2-hr） was obtained with the feed solution at 8...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2010-12, Vol.22 (12), p.1860-1867
Main Authors: Hou, Deyin, Wang, Jun, Zhao, Changwei, Wang, Baoqiang, Luan, Zhaokun, Sun, Xiangcheng
Format: Article
Language:English
Subjects:
Acidification
brackish groundwater
Contact
deposit
Distillation
Feasibility Studies
fluoride removal
Fluorides
Fluorides - isolation & purification
Flux
Groundwater
Hydrogen-Ion Concentration
membrane distillation
Membranes
Modules
Rejection
Temperature
Water Pollutants, Chemical - isolation & purification
地下水
渗透通量
直接接触式
膜蒸馏
进料浓度
饲料酸化
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Summary:The direct contact membrane distillation applied for fluoride removal from brackish groundwater was investigated. The self-prepared polyvinylidene fluoride membrane exhibited high rejection of inorganic salt solutes. The maximum permeate flux 35.6 kg/（m^2-hr） was obtained with the feed solution at 80℃ and the cold distillate water at 20℃. The feed concentration had no significant impact on the permeate flux and the rejection in fluoride. The precipitation of CaCO3 would clog the hollow fiber inlets and foul the membrane surface with increasing concentration factor when natural groundwater was used directly as the feed, which resulted in a rapid decline in the module efficiency. This phenomenon was diminished by acidification of the feed. The experimental results showed that the permeate flux and the quality of obtained distillate kept stable before concentration factor reached 5.0 with the acidified groundwater as feed. The membrane module efficiency began to decline gradually when the feed continued to be concentrated, which can be mainly attributed to the formation of CaF2 deposits on the membrane surface. In addition, a 300 hr continuous fluoride removal experiment of acidified groundwater was carried out with concentration factor at 4.0, the permeate flux kept stable and the permeate fluoride was not detected.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(09)60332-6