Abstract ▼ AI-Helper

Studies on bromate-free disinfection using high voltage impulse technique and on kinetics

Hye Ran Kim

Department of Nanobiotronics, Hoseo University Asan, 336-795, south Korea

(Supervised by professor In-Soung Chang)



The objective of this study was to de...

Studies on bromate-free disinfection using high voltage impulse technique and on kinetics

Hye Ran Kim

Department of Nanobiotronics, Hoseo University Asan, 336-795, south Korea

(Supervised by professor In-Soung Chang)



The objective of this study was to determine the effect of high voltage impulse (HVI) induction on microbial inactivation of Escherichia coli(ATCC 8739) and on formation of bromate(BrO3-). More than 2-log reduction of E.coli was achieved after HVI treatment at 20kV/cm, 100Hz, 4μs pulse width with different initial concentration of E.coli. Bromate was not generated regardless of bromide(Br-) concentration(100ppb, 1000ppb) and applied voltage(10,15,20kV). The kinetics of inactivation of E.coli was analyzed by the modified Chick & Watson’s law with the increasing electric field strength from 10 to 20kV/cm. Also, chemical analysis of hydroxyl radical in HVI system was studied by using RNO(N,N-Dimethyl-4-nitrosoaniline). RNO concentration was reduced from 6.36×10-5mol/L to 4.57×10-5mol/L approximately 28%, indicating that hydroxyl radical was generated under the corona discharging environment. Change in pH induced by HVI was observed, but a detail mechanism for the pH variation was not clear yet.

Keyword