MMBR system has been suggested as a promising system to resolve harvesting problems induced from low settling efficiency of microalgae. And recently, a lot of research on reducing fouling at the MMBR system has investigated focused on EPS in many cases. EPS of microalgae mainly consists of polysaccharides and protein components, and is produced through photosynthesis and nitrogen-carbon metabolic pathways. Especially, P-EPS is one of major compounds which occur membrane fouling phenomenon, as its hydrophobic protein components cause floc formation and cake layer accumulation. And it is already known that almost every microalgae can metabolize P-EPS or Chl-a when nitrogen sources as a substrate is insufficient or exhausted situation. With the above backgrounds, uptake rates of P-EPS or Chl-a by Scenedesmus quadricauda according to the type of carbon source and nitrogen concentration were evaluated in order to verify correlation between carbon source vs P-EPS production, and indeed Scenedesmus quadricauda uses P-EPS or Chl-a when the amounts of nitrogen sourc es in the feed is not satisfied. As a result, it was shown that P-EPS and Chl-a production were increased proportional to nitrogen concentration under organic carbon condition. And especially, the amo unts of P-EPS and Chl-a in the cell were diminished with the nitrogen source becomes insufficient or exhausted. Because P-EPS accelerates fouling at the MMBR system, P-EPS degradation by Scenedesmus quadricauda in order to get nitrogen source may contribute to reducing fouling. About a affects of N-consumed Chl-a to the MMBR fouling, more survey is needed. On the contrary, considering the purpose of MMBR system of this study, i.e. harvesting useful high value microalgae efficiently feeding adequate industrial process wastewater, it seems like difficult to maintain satisfied metabolic activity and to harvest with high yield rate using nitrogen-poor MMBR feed.

ABSTRACT
1. 서 론
2. 연구방법
    2.1 미세조류 배양
    2.2 실험 장치 및 방법
    2.3 분석방법
3. 결 과
    3.1 탄소원 종류 및 질소 농도에 따른 대사특성 및P-EPS, Chl-a 발생경향
    3.2 대체 질소원으로서의 P-EPS 및 Chl-a 소비특성
4. 결 론
References

• 최윤정(경희대학교 일반대학원 환경응용과학과) | Yun-Jeong Choi (Department of Applied Environmental Science, Kyung Hee University)
• 심태석(경희대학교 일반대학원 환경응용과학과) | Tae-Suk Sim (Department of Applied Environmental Science, Kyung Hee University)
• 황선진(경희대학교 일반대학원 환경응용과학과) | Sun-Jin Hwang (Department of Applied Environmental Science, Kyung Hee University) Corresponding author