Technische Universität München, Chair of Urban Water Systems Engineering, Am Coulombwall 8, 85748 Garching, Germany.
Chemosphere. 2015 Feb;121:47-53. doi: 10.1016/j.chemosphere.2014.10.075. Epub 2014 Nov 27.
This work investigated the capability of using a boron-doped diamond (BDD) electrode for bacterial disinfection in different water matrices containing varying amounts of chloride. The feed water containing Pseudomonas aeruginosa was electrochemically treated while applying different electrode conditions. Depending on the applied current density and the exposure time, inactivation between 4- and 8-log of the targeted microorganisms could be achieved. The disinfection efficiency was driven by the generation of free chlorine as a function of chloride concentration in the water. A synergetic effect of generating both free chlorine and ozone in situ during the disinfection process resulted in an effective bactericidal impact. The formation of the undesired by-products chlorate and perchlorate depended on the water matrix, the applied current density and the desired target disinfection level. In case of synthetic water with a low chloride concentration (20 mg L(-1)) and an applied current density of 167 mA cm(-2), a 6-log inactivation of Pseudomonas aeruginosa could be achieved after 5 min of exposure. The overall energy consumption ranged between 0.3 and 0.6 kW h m(-3) depending on the applied current density and water chemistry. Electrochemical water disinfection represents a suitable and efficient process for producing pathogen-free water without the use of any chemicals.
本研究考察了在含有不同浓度氯化物的不同水基质中使用掺硼金刚石（BDD）电极进行细菌消毒的能力。含有铜绿假单胞菌的原水在施加不同电极条件下进行电化学处理。根据施加的电流密度和暴露时间，可以实现目标微生物 4-8 个对数的灭活。消毒效率取决于水中氯化物浓度生成的游离氯。在消毒过程中，原位生成游离氯和臭氧的协同作用导致了有效的杀菌效果。在水基质、应用电流密度和所需的目标消毒水平的影响下，形成了不受欢迎的副产物氯酸盐和高氯酸盐。在氯化物浓度低（20 mg/L）和应用电流密度为 167 mA/cm2 的合成水中，经过 5 分钟的暴露，铜绿假单胞菌的 6 个对数的灭活可以实现。总的能耗范围为 0.3 至 0.6 kWh/m3，具体取决于应用电流密度和水化学性质。电化学水消毒是一种无需使用任何化学物质即可生产无病原体水的合适且有效的方法。
