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http://dx.doi.org/10.7845/kjm.2013.3068

Combined Chlorite-Monochloramine Application for Controlling Nitrifying and Heterotrophic Bacteria in Drinking Water Distribution System  

Park, Se-Keun (Department of Environmental Engineering, Kangwon National University)
Kim, Yeong-Kwan (Department of Environmental Engineering, Kangwon National University)
Choi, Sung-Chan (Department of Environmental Science & Biotechnology, Hallym University)
Publication Information
Korean Journal of Microbiology / v.49, no.4, 2013 , pp. 321-327 More about this Journal
Abstract
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 ($0.66{\pm}0.01mg/L$) either with or without monochloramine at $1.77{\pm}0.03mg/L$. Both chlorite alone and combined chlorite-monochloramine applications effectively reduced biofilm and bulk AOB levels to near or below the detection limit ($0.6MPN/cm^2$ and 0.2 MPN/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.
Keywords
biofilm; chlorite; drinking water; monochloramine;
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