DEFLUORIDATION OF DRINKING WATER BY ELECTROCOAGULATION WITH STAINLESS STEEL ELECTRODES


Kabdasli I. , KONUK K., Tunay O.

FRESENIUS ENVIRONMENTAL BULLETIN, vol.26, no.1, pp.345-351, 2017 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 1
  • Publication Date: 2017
  • Title of Journal : FRESENIUS ENVIRONMENTAL BULLETIN
  • Page Numbers: pp.345-351

Abstract

In the present study, defluoridation of drinking water by electrocoagulation using stainless steel electrodes was experimentally investigated. In order to determine the effect of electrocoagulation operation parameters such as the applied current density (0.75-15.16 mA/cm(2)), initial pH (3.0-6.0), initial fluoride concentration (2-5 mg/L) and type (NaCl and KCl) and dose (50-150 mg/L) of electrolyte on fluoride removal, an experimental study was performed. The results of the experimental study indicated that all operating parameter had crucial effects on defluoridation efficiency. An increase in the applied current density enhanced defluoridation performance. A decrease in initial pH significantly improved defluoridation efficiency. There was no remarkable effect of NaC1 concentration (up to 150 mgCl/L) whereas increasing KCl concentration deteriorated fluoride removal efficiency. Results have also demonstrated that remaining fluoride concentration can be reduced to 1.5 mg/L when electrocoagulation operation conditions are optimized. Optimum electrocoagulation operation conditions were determined as; initial pH of 3.0, applied current density of 11.37 mA/cm(2), electrolyte concentration of 50 mg/L NaCl for the sample containing an initial fluoride concentration of 5 mg/L in the case of stainless steel electrodes used as anodes and cathodes.