Earticle

초록

영어

Most of microorganisms tend to live in aggregates on surfaces (i.e., biofilm) rather than in planktonic state in natural, clinical, and industrial settings. In biofilm state, bacterial cells are imbedded in polymeric substances (e.g., extracelluar polymeric substance and lippopolysaccharide) secreted by bacteria themselves, which give them advantages to survive in harsh environmental conditions. Biofilm is formed on every surface including membrane filters in water purification. Biofilm formed on membrane filters is difficult to be removed by physical treatments. Chlorine is commonly used to kill bacteria and to retard biofilm formation. However, chlorine can affect not only bacterial mortality but also damage to membrane filter. In addition, organic matters and cell debris generated by the chlorine treatment can be nutrients for bacteria, which even proliferates biofilm formation on membrane filter (Baker, J.S., and Dudley, L.Y., 1998). Disturbing normal metabolic networks involved in biofilm formation in bacteria is an alternative method to reduce biofilm without damaging surface materials and stimulating biofilm formation (Balaban, N., 2008, Rasmussen et al., 2005). Previously, we reported that ginger extract was effective to reduce biofilm in borosilicate bottle. In this study, we hypothesized that ginger extract can be applied to reduce biofilm formation on membrane filter in water purification. The objective of this study was to apply ginger extract to inhibit biofilm formation on membrane filter and to investigated bacterial physiology and molecular mechanisms involved in biofilm inhibition. To this end, we investigated the effects of ginger extract on bacterial growth, biofilm formation, and protein expression using Pseudomonas aeruginosa as a model bacterium. Ginger extract was effective to reduce biofilm formation by reducing the production of extracellular polymeric substance, and appeared to be involved in iron metabolism. Ginger extract was also successful to reduce biofouling rate in a laboratory-scale reverse osmosis process. This study demonstrated the effectiveness of biofilm inhibitors in membrane filtration process.

키워드

저자

• Hee-Deung PARK [ School of Civil, Environmental and Architectural Engineering, Korea University. ]
• Han-Shin KIM [ School of Civil, Environmental and Architectural Engineering, Korea University. ]
• Ji-Yun LEE [ School of Civil, Environmental and Architectural Engineering, Korea University. ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국생물공학회 학술대회

• 간기

  반년간

• 수록기간

  1985~2013

• 십진분류

  KDC 476 DDC 576