Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada.
Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada.
Water Res. 2017 Dec 1;126:299-307. doi: 10.1016/j.watres.2017.09.029. Epub 2017 Sep 18.
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-W-oxide anodes. The influence of current density, bacterial load, initial chloride concentration, solution pH, and the type of bacteria (E. coli D21, E. coli O157:H7, 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 NaCl solution contaminated with ∼10 CFU/mL bacteria by applying a current density ≥1 mA/cm through the cell.100% inactivation of E. coli D21 was achieved with a contact time of less than 60 s and power consumption of 48 Wh/m, by applying a current density of 6 mA/cm in a 0.1 M NaCl solution contaminated with ∼10 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.
电化学消毒已被证明是一种有效的方法，对于处理饮用水供应、工业原水供应、液体食品和废水排放物，所需的接触时间很短。在本工作中，使用掺 Sb 的 Sn-W-氧化物阳极在含氯溶液中研究了盐水的电化学消毒，该盐水被细菌污染。系统研究了电流密度、细菌负荷、初始氯浓度、溶液 pH 值以及细菌类型（E. coli D21、E. coli O157:H7 和 E. faecalis）对消毒效果的影响。还研究了天然有机物和自由基清除剂对消毒过程的影响。电化学系统在 0.1 M NaCl 溶液中非常有效，该溶液中污染有约 10 CFU/mL 的细菌，通过在电池中通以≥1 mA/cm 的电流密度。在 0.1 M NaCl 溶液中污染有约 10 CFU/mL 的 E. coli D21 时，通过施加 6 mA/cm 的电流密度，接触时间小于 60 s，能耗为 48 Wh/m，即可实现 100%的细菌失活。在电化学过程中就地产生的活性氯物种和活性氧物种（如羟基自由基）被确定为细菌失活的原因。
