Electrochemical disinfection of bacteria-laden water using antimony-doped tin-tungsten-oxide electrodes

Electrochemical disinfection has been shown to be an efficient method with a shortrequired contact time for treatment of drinking water supplies, industrial raw water supplies, liquid foodstuffs, and wastewater effluents. In the present work, the electrochemical disinfection of saline water contaminated with bacteria was investigated in chloride-containing solutions using Sb-doped Sn-80%-W-20%-oxide anodes. The influence of current density, bacterial load, initial chloride concentration, solution pH, and the type of bacteria (E. coli D21, E. coli 0157:117, and E. faecalis) on disinfection efficacy was systematically examined. The impact of natural organic matter and a radical scavenger on the disinfection process was also examined. The electrochemical system was highly effective in bacterial inactivation for a 0.1 M NaCI solution contaminated with similar to 10(7) CFU/mL bacteria by applying a current density >= 1 mA/cm(2) through the cell.100% inactivation of E. coil D21 was achieved with a contact time of less than 60 s and power consumption of 48 Wh/m(3), by applying a current density of 6 mA/cm(2) in a 0.1 M NaCl solution contaminated with similar to 10(7) CFU/mL. Reactive chlorine species as well as reactive oxygen species (e.g. hydroxyl radicals) generated in situ during the electrochemical process were determined to be responsible for inactivation of bacteria. (C) 2017 Elsevier Ltd. All rights reserved.