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KMID : 1024520110200070891
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Journal of the Environmental Sciences
2011 Volume.20 No. 7 p.891 ~ p.898
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Effect of Disinfection Process Combination on E. coli Deactivation and Oxidants Generation
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Kim Dong-Seog
Park Young-Seek
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Abstract
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The aim of this research was to evaluate the effect of combination of disinfection process (electrolysis, UV process) on Escherichia coli (E. coli) disinfection and oxidants (OH radical, ClO2, HOCl, H2O2 and O3) generation. The effect of electrolyte type (NaCl, KCl and Na2SO4) on the E. coli disinfection and oxidants generation were evaluated. The experimental results showed that performance of E. coli disinfection of electrolysis and UV single process was similar. Combination of electrolysis and UV process enhanced the E. coli disinfection and 4-carboxybenzaldehyde (4-CBA, indicator of the generation of OH radical) degradation. It is clearly showed synergy effect on disinfection and OH radical formation. However chlorine (ClO2, HOCl) and oxygen type (H2O2, O3) oxidants were decreased with the combination of two process. In electrolysis + UV complex process, electro-generated H2O2 and O3 were reacted with UV light of UV-C lamp and increased 4-CBA degradation(increase OH radical). Disinfection of electrolyte of chlorine type was higher than that of the sulfate type electrolyte due to the higher generation of OH radical and oxidants.
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KEYWORD
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E. coli Disinfection, Oxidant, Electrolysis, UV process, Electro+UV process, Synergy effect
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