Deionized water highly contaminated with E.coli and containing sodium sulfate as an electrolyte was treated in a circulating system with the use of an electrochemical cell with copper electrodes and pulsed electrical signals at 2 V voltages, 50 Hz frequency and 0.1-0.2 A current. The process was found to be effective and the percentage of the initial concentration of bacteria which were destroyed was found to be proportional to both treatment time and concentration of hydroxyl radicals. Detection of hydroxyl radicals formed by water discharge during electrolysis was confirmed using N,N-dimethyl-p-nitrosoaniline (RNO)  as a spin trap. Several parameters, such as changes in different electrode materials and contact wire materials were analyzed, and recommendations how to increase the disinfection efficiency and decrease the time of treatment were discussed.

Chlorine-free method of disinfection of water contaminated with <i>E. coli</i>

247th National Meeting (2014)

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Chlorine-free method of disinfection of water contaminated with E. coli