DocumentCode :
2508778
Title :
Factors Influencing the Removal of Fluoride from Groundwater by Nanofiltration
Author :
Ma Wei-fang ; Liu Wen-jun ; Chen Guo-wei
Author_Institution :
Dept. of Environ. Sci. & Eng., Tsinghua Univ., Beijing, China
fYear :
2009
fDate :
11-13 June 2009
Firstpage :
1
Lastpage :
5
Abstract :
The influence of co-existing chloride, sulfate, pH, and temperature to defluoridation of groundwater using nanofiltration membrane and membrane fouling were studied. The results show that nanofiltration has retention effect to all co-existing ions. When feed fluoride concentration was less than 6 mg/L, the fluoride concentration in permeated water was less than 1.2 mg/L which could reach the drinking water standard in China rural area. The fluoride retention rate decreases with the increase of feed fluoride, co-existing ions concentration or pH. The decreasing percentage of fluoride retention rate is the same when Cl- concentration increased 1 mol or SO4 2- concentration increased 0.5 mol. The fluoride retention rate increase when feed chloride concentration exceeded 220 mg/L. But the variation had no significant change. The fluoride retention rate increases with the increasing of pH, while there is a milestone on pH 4.4. Environmental scanning electron microscope (ESEM) and its energetic chart analysis apparatus, X-ray Diffration(XRD) analysis show that the main fouling component was CaCO3. The fouling membrane could be recovered flux using citric acid and ammonia cleaning method.
Keywords :
X-ray diffraction; contamination; decontamination; fluorine compounds; groundwater; membranes; nanobiotechnology; nanofiltration; scanning electron microscopy; water storage; China rural area; X-ray diffration; ammonia cleaning method; citric acid; defluoridation; drinking water; energetic chart analysis apparatus; environmental scanning electron microscope; feed fluoride concentration; fluoride removal; fluoride retention rate; groundwater; ion retention effect; membrane fouling; nanofiltration membrane; pH; permeated water; recovered flux; Biomembranes; Cleaning; Feeds; Filtration; Noise measurement; Reverse osmosis; Scanning electron microscopy; Teeth; Temperature; Water resources;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Bioinformatics and Biomedical Engineering , 2009. ICBBE 2009. 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2901-1
Electronic_ISBN :
978-1-4244-2902-8
Type :
conf
DOI :
10.1109/ICBBE.2009.5162848
Filename :
5162848
Link To Document :
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