Development of bacteria-free-water distribution system using electrochemical sterilization method.

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Bacterial regrowth is a nuisance in water distribution systems as well as in domestic water-filtration units. The main strategy for the regulation of bacterial contamination and the prevention of microbial fouling is the use of chemical disinfectants. Alternative technologies for minimizing the formation of disinfectant byproducts are desired. in this study. the development of bacteria-free-water distribution system using electrochemical sterilization method was carried out. When a potential of 1.2 V vs. a saturated calomel electrode (SCE) was applied to the conductive paint electrode, bacterial cells attached on the electrode were completely killed. By applying a negative potential, the attached cells were removed from the surface of the electrode. In a field experiment, accumulation of the bacterial cells and formation of bioflims on the electrode were prevented by application of an alternating potential. The novel TiN electrode formed by radio-frequency arc spraying exhibits low electrical resistance and good electrochemical stability. This type of electrode can be used as an electrochemical antifouling device on various surface of structures and poses little threat to the environment.