Application of the membrane process to wastewater treatment and reuse has been increasing due to water shortage, water pollution and an increase in water demand. Membrane fouling including biofouling should be controlled to extend its application. In this study, modulation of diffusible signal factor (DSF) system, the quorum sensing (QS) system that regulates EPS formation by microorganisms, was considered as a promising option to manage biofouling. Among many DSF compounds, cis -2-Decenoic acids (CDA) was selected. The experimental results showed that, as the CDA concentration increased, the density and number of stained cells decreased. The lowest density was observed when the CDA concentration of 300 nM was applied. The EPS on membrane surface decreased with increasing concentration of CDA. The CDA dosing also affected the EPS composition. At the 300 nM CDA dose, the total EPS reduced by up to 57% and the protein fraction by 35%. This study revealed the biofilm reduction effect of CDA under various conditions for MBR sludge. The application of CDA can be adapted to control biofouling in the MBR process.

ABSTRACT
1. 서 론
2. 실험재료 및 방법
    2.1 실험재료
    2.2 CDC 반응기 이용 생물막 형성 실험
    2.3 EPS 추출 및 분석
    2.4 공초점 레이저 주사 현미경 이용 막표면 분석
3. 결과 및 고찰
    3.1 DSF농도가 바이오필름 형성에 미치는 효과
    3.2 DSF 접촉 시간이 바이오필름 형성에 미치는 효과
    3.3 DSF 주입이 EPS 특성에 미치는 영향
4. 결 론
References

• 송원중(건국대학교 산업기술연구원) | Wonjung Song (The Academy of Applied Science and Technology, Konkuk University)
• 류준희(건국대학교 산업기술연구원) | Junhee Ryu (The Academy of Applied Science and Technology, Konkuk University)
• 최수영(건국대학교 산업기술연구원) | Suyoung Choi (1The Academy of Applied Science and Technology, Konkuk University)
• 권지향(건국대학교 사회환경공학부) | Jihyang Kweon (Department of Civil and Envbironmental Engineering, Konkuk University) Corresponding author