Electrochemical disinfection is an efficient method used for treatment of drinking water. It has great environmental compatibility as compared to conventional disinfection methods. In this study, the effect of the electrode materials and working conditions was investigated. The experimental results show that the type 1 (iridium oxide-coated anode and cathode) electrode system generated high concentration of free available chlorines (FACs) because of iridium has higher electrocatalytic activity than ruthenium. When applied voltage increases, the acceleration of oxidation reactions in the electrochemical cell resulted in the increased generation of FACs. The solution inflow rate is approximately inversely proportional to the residence time of salt solution in the electrochemical cell. Long residence time could induce a higher FAC generation. In addition to it, the production of FACs is increased with the decreasing electrode open ratio (a/A). With a/A > 0 and a lower inflow rate, the FAC concentration tends to approach to a maximum value because of by-product generation. The ozone species generated in the electrochemical cell were determined by the maximum voltage. The electrode open ratio affected ozone generation rate due to mixing effect of cathode products.
- electrode material
- electrode open ratio
- mixed oxidant solution
- water disinfection
- First received 6 February 2015.
- Accepted in revised form 22 May 2015.
- © IWA Publishing 2015