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

作者：Emamjomeh Mohammad M^*; Sivakumar Muttucumaru; Varyani Ali Safari

来源：Desalination, 2011, 275(1-3): 102-106.

DOI：10.1016/j.desal.2011.02.032

• Electrocoagulation/flotation (ECF) process
• Fluoride removal mechanism
• Analysis
• Sludge characteristics

Electrocoagulation is a method of applying direct current to sacrificial electrodes that are submerged in an aqueous solution. Dissolving aluminum (Al(3+)) 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.

• 出版日期2011-7-15