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KMID : 0364820130490040321
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Korean Journal of Microbiology
2013 Volume.49 No. 4 p.321 ~ p.327
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Combined Chlorite-Monochloramine Application for Controlling Nitrifying and Heterotrophic Bacteria in Drinking Water Distribution System
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Park Se-Keun
Kim Yeong-Kwan
Choi Sung-Chan
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Abstract
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In the present work, the reactors that harbor bacterial biofilms including ammonia-oxidizing bacteria (AOB) and
heterotrophic bacteria were treated with a continuous dose of chlorite (0.66 ± 0.01 mg/L) either with or without
monochloramine at 1.77 ± 0.03 mg/L. Both chlorite alone and combined chlorite-monochloramine applications
effectively reduced biofilm and bulk AOB levels to near or below the detection limit (0.6 MPN/cm2
and 0.2MPN/ml). The combined chlorite-monochloramine application exhibited greater AOB inactivation than chlorite
alone. Unlike AOB, heterotrophic plate count (HPC) was unaffected by chlorite alone. In contrast to chlorite-only
application, a combination of chlorite and monochloramine resulted in a significant reduction in HPC levels with log
reductions of 3.1 and 3.0 for biofilm and bulk water, respectively. The results demonstrate that the combined
chlorite-monochloramine application can provide an effective treatment for the inhibition of AOB and heterotrophic
bacteria in a drinking water distribution system.
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KEYWORD
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biofilm, chlorite, drinking water, monochloramine
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