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Membrane Water Treatment Volume 10, Number 6, November 2019 , pages 395-404 DOI: https://doi.org/10.12989/mwt.2019.10.6.395 |
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Intermittent chlorination shifts the marine biofilm population on reverse osmosis membranes |
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Dawoon Jeong, Chang-Ha Lee, Seockheon Lee and Hyokwan Bae
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| Abstract | ||
| The influence of chlorine on marine bacterial communities was examined in this study. A non-chlorine-adapted marine bacterial community (NCAM) and a chlorine-adapted bacterial community (CAM, bacterial community treated with 0.2 mg-Cl2/L chlorine) were cultivated for 1 month. A distinct difference was observed between the NCAM and CAM, which shared only eight operational taxonomic units (OTUs), corresponding to 13.1% of the total number of identified OTUs. This result suggested that chlorine was responsible for the changes in the marine bacterial communities. Kordiimonas aquimaris was found to be a chlorine-resistant marine bacterium. The effect of intermittent chlorination on the two marine biofilm communities formed on the reverse osmosis (RO) membrane surface was investigated using various chlorine concentrations (0, 0.2, 0.4, 0.6 and 0.8 mg Cl2/L). Although the average number of adherent marine bacteria on the RO membrane over a period of 7 weeks decreased with increasing chlorine concentration, disinfection efficiencies showed substantial fluctuations throughout the experiment. This is due to chlorine depletion that occurs during intermittent chlorination. These results suggest that intermittent chlorination is not an effective disinfection strategy to control biofilm formation. | ||
| Key Words | ||
| marine bacterial community; intermittent chlorination; terminal restriction fragment length polymorphism (T-RFLP); marine biofilm; qPCR; statistical analysis | ||
| Address | ||
| Dawoon Jeong: Institute of Environmental Research, Kangwon National University, 1, Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea Chang-Ha Lee: Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 120-749, Republic of Korea Seockheon Lee: Center for Water Resource Cycle Research, Korea Institute of Science and Technology, 39-1 Hawolgok-Dong, Seongbuk-Gu, Seoul 136-791, Republic of Korea Hyokwan Bae: Department of Civil and Environmental Engineering, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea | ||
