Center for Water Resource Cycle Research, Korea Institute of Science and Technology, 39-1 Hawolgok-Dong, Seongbuk-Gu, Seoul, 136-791, Republic of Korea.
Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul, 120-749, Republic of Korea.
Appl Microbiol Biotechnol. 2018 Aug;102(16):7183-7194. doi: 10.1007/s00253-018-9111-5. Epub 2018 Jun 14.
The effect of chlorine disinfection on marine biofilm populations and communities formed on membrane surfaces was investigated under two feedwater conditions: raw seawater and deep bed filtration-treated seawater. As a result of chlorination, the structure of the biofilm community on the microfiltration/ultrafiltration and reverse osmosis membrane coupons shifted significantly at the genus level. However, the total bacterial population was not reduced under the two feedwater conditions. This failure to control the biofilm was attributed to the adaptation and survival of selected bacteria under chlorine stress. Phaeobacter caeruleus, isolated from the biofilm, was examined as a representative chlorine-resistant biofilm-forming bacterium. The number of viable P. caeruleus was significantly reduced (as much as 99.8%) after ultraviolet (UV) disinfection. The results indicated that additional disinfection by UV irradiation can inactivate chlorine-resistant bacteria. Therefore, tandem chlorination-UV disinfection may enhance the efficiency of biofouling control in seawater reverse osmosis processes. The synergistic effects of tandem chlorination-UV irradiation on the marine biofilm community should be investigated in future studies.
研究了在两种进水条件下（原海水和深床过滤处理后的海水），氯消毒对膜表面形成的海洋生物膜种群和群落的影响。由于氯化作用，微滤/超滤和反渗透膜片上生物膜群落的结构在属水平上发生了显著变化。然而，在两种进水条件下，总细菌种群并未减少。这种无法控制生物膜的情况归因于在氯胁迫下选择细菌的适应和存活。从生物膜中分离出的 P. caeruleus 被作为一种具有代表性的耐氯生物膜形成细菌进行了研究。经过紫外线 (UV) 消毒后，活的 P. caeruleus 数量明显减少（高达 99.8%）。结果表明，紫外线照射的额外消毒可以灭活耐氯细菌。因此，串联氯化-UV 消毒可以提高海水反渗透过程中生物污垢控制的效率。在未来的研究中，应该研究串联氯化-UV 照射对海洋生物膜群落的协同作用。
