Keywords: bromate, disinfection, high voltage pulse, water treatment
Summary:We designed and assembled high voltaged pulse generating system in our laboratory. The HVI system is consisted of power supply, high voltage generator, capacitors and impulse generator. The impulse with 10 to 20 kV/cm of electric fields was introduced to sample waters in order to monitor if bromate is formed or not. As the precursor of bromate, i.e., bromide (Br-) was spiked into the sample waters by 1,000 ppb, Bromate was analyzed by ion chromatography (Metrohm Inc., Swiss). Bromate was not generated at all times, indicating that the bromate formation was completely inhibited. A model microorganism, Escherichia coli is inoculated to the sample waters to test the disinfection efficiency. More than 2-log reduction (99 %) of E.coli was achieved after HVI treatment with 20kV/cm, 100Hz, 4μs pulse width. Consequently, HVI technique could be used for alternative strategy for bromate free-disinfection procedure for water disinfection.