Co-Application of Coagulation and Electrochemical Processes to Remove Fluoride From Water



Rabbani D^{1, 2} ; Parmoozeh Z¹ ; Mahvi AH^{3, 4} ; Salem A¹
Source: Fluoride Published:2020

Abstract

Fluoride at more than the standard level in drinking water can result in health hazards. Therefore, different technologies are used to remove it. The aim of this study was to examine fluoride removal from water with the co-application of alum-coagulation and an electrochemical processes. A bench scale study was conducted in a batch system on 138 water samples with fluoride concentrations of 5, 12.5, and 20 mg.L-1. First, in the coagulation process, the effects of run time and alum dosage on fluoride removal were investigated. Then, the effect of an electrochemical process using aluminum electrodes was studied. Finally, the co-application of the electrochemical and the coagulation processes was investigated. The results showed that the average fluoride removal using the coagulation process, with 15 minutes run time and pH =6, was 86.63%. Under the same conditions, the average fluoride removal efficiency with the electrochemical process was 86.70%. The co-application of both processes resulted in 91.33% removal. The co-application of chemical coagulation and an electrochemical process to remove fluoride from polluted water is significantly more efficient than the application of each of them alone. © 2020, International Society for Fluoride Research. All rights reserved.