| Title | Combined Chlorite-Monochloramine Application for Controlling Nitrifying and Heterotrophic Bacteria in Drinking Water Distribution System | ||
| Author | Se-Keun Park1, Yeong-Kwan Kim1, and Sung-Chan Choi2* | ||
| Address | 1Department of Environmental Engineering, Kangwon National University, Chuncheon 200-701, Republic of Korea, 2Department of Environmental Science & Biotechnology, Hallym University, Chuncheon 200-702, Republic of Korea | ||
| Bibliography | Korean Journal of Microbiology, 49(4),321-327, 2013 | ||
| DOI | http://dx.doi.org/10.7845/kjm.2013.3068 | ||
| Key Words | biofilm, chlorite, drinking water, monochloramine | ||
| Abstract | In the present work, the reactors that harbor bacterial biofilms including ammonia-oxidizing bacteria (AOB) andheterotrophic bacteria were treated with a continuous dose of chlorite (0.66 ± 0.01 mg/L) either with or withoutmonochloramine at 1.77 ± 0.03 mg/L. Both chlorite alone and combined chlorite-monochloramine applicationseffectively 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 chloritealone. Unlike AOB, heterotrophic plate count (HPC) was unaffected by chlorite alone. In contrast to chlorite-onlyapplication, a combination of chlorite and monochloramine resulted in a significant reduction in HPC levels with logreductions of 3.1 and 3.0 for biofilm and bulk water, respectively. The results demonstrate that the combinedchlorite-monochloramine application can provide an effective treatment for the inhibition of AOB and heterotrophicbacteria in a drinking water distribution system. | ||
| Download PDF | 49(4)_04_p.321-327.pdf | ||