Analysis and the understanding of fluoride removal mechanisms by an electrocoagulation/flotation (ECF) process

被引：105

作者：

Emamjomeh, Mohammad M. ^{[1
]}

Sivakumar, Muttucumaru ^{[2
]}

Varyani, Ali Safari ^{[3
]}

机构：

[1] Qazvin Univ Med Sci, Environm Hlth Engn Dep, Fac Hlth, Res Ctr Community Dev & Hlth Promot, Qazvin, Iran

[2] Univ Wollongong, Sustainable Water & Energy Res Grp, Sch Civil Min & Environm Engn, Fac Engn, Wollongong, NSW 2522, Australia

[3] Qazvin Univ Med Sci, Occupat Hlth Grp, Fac Hlth, Qazvin, Iran

来源：

DESALINATION | 2011年 / 275卷 / 1-3期

关键词：

Electrocoagulation/flotation (ECF) process; Fluoride removal mechanism; Analysis; Sludge characteristics; WASTE-WATER; SAHARA WATER; ALUMINUM; DEFLUORIDATION;

D O I：

10.1016/j.desal.2011.02.032

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Electrocoagulation is a method of applying direct current to sacrificial electrodes that are submerged in an aqueous solution. Dissolving aluminum (Al3+) is predominant in the acidic condition and aluminum hydroxide has tendency soluble. The defluoridation process was found to be efficient for a pH ranging from 6 to 8. The fluoride removal mechanisms are investigated based on the solution speciation (Al and Al-F complexes) and dried sludge characteristics in the electrocoagulator. The XRD analysis of the composition of the dried sludge shows the formation of Al(OH)(3-x)F-x and provides confirmation for the main mechanism for fluoride removal. The mechanism of the fluoride removal was confirmed to be not only the competitive adsorption between OH- and F- but also the formation of solid cryolite in pH range of 5-8. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：102 / 106

页数：5

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