상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제35권3호
  • /
  • Pages.197-204
  • /
  • 2021
  • /
  • 1225-7672(pISSN)
  • /
  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
권호 표지
DOI QR코드

DOI QR Code

MBR에서 F/M비가 EPS 생성 및 fouling에 미치는 영향

Effects of F/M ratio on the EPS production and fouling at MBR

  • 김윤지 (경희대학교 일반대학원 환경응용과학과) ;
  • 최윤정 (경희대학교 일반대학원 환경응용과학과) ;
  • 황선진 (경희대학교 일반대학원 환경응용과학과)
  • Kim, Yun-Ji (Department of Applied Environmental Science, Kyung Hee University) ;
  • Choi, Yun-Jeong (Department of Applied Environmental Science, Kyung Hee University) ;
  • Hwang, Sun-Jin (Department of Applied Environmental Science, Kyung Hee University)
  • 투고 : 2021.05.03
  • 심사 : 2021.06.03
  • 발행 : 2021.06.15
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

In MBR, extracellular polymeric substance (EPS) is known as an important factor of fouling; soluble EPS (sEPS) affects internal contamination of membrane, and bound EPS (bEPS) affects the formation of the cake layer. The production of EPS changes according to the composition of influent, which affects fouling characteristics. Therefore, in this study, the effects of the F/M ratio on the sEPS concentration, bEPS content, and fouling were evaluated. The effects of F/M ratio on the amount and composition of EPS were confirmed by setting conditions that were very low or higher than the general F/M ratio of MBR, and the fouling occurrence characteristics were evaluated by filtration resistance distribution. As a result, it was found that the sEPS increased significantly with the increase of the F/M ratio. When the substrate was depleted, bEPS content decreased because bEPS was hydrolyzed into BAP and seemed to be used as a substrate. In contrast, when the substrate is sufficient, UAP (utilization-associated products) was rapidly generated in proportion with the consumption of the substrate. UAP has a relatively higher Protein/Carbohydrate ratio (P/C ratio) than BAP, and this means, it has a higher adhesive force to the membrane surface. As a result, UAP seems like causing fouling rather than BAP (biomass-associated products). Therefore, Rf (Resistance of internal contamination) increased rapidly with the increase of UAP, and Rc (Resistance of cake layer) increased with the accumulation of bEPS in proportion, and as a result, the fouling interval was shortened. According to this study, a high F/M ratio leads to an increment in UAP generation and accumulation of bEPS, and by these UAP and bEPS, membrane fouling is promoted.

키워드

과제정보

이 논문은 2019년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구이며(NRF-2019R1A2C1084155) 이에 감사드립니다.

참고문헌

  1. Aquino, S.F. and Stuckey D.C. (2008). Integrated model of the production of soluble microbial products (SMP) and extracellular polymeric substances (EPS) in anaerobic chemostats during transient conditions, Biochem. Eng. J., 38(2), 138-146. https://doi.org/10.1016/j.bej.2007.06.010
  2. Babatsouli, P., Palogos, I., Michalodimitraki, E., Costa, C. and Kalogerakis, N. (2015). Evaluation of a MBR pilot treating industrial wastewater with a high COD/N ratio, J. Chem. Technol. Biotechnol., 90(1), 26-33. https://doi.org/10.1002/jctb.4364
  3. Cosenza, A., Di Bella, G., Mannina, G. and Torregrossa, M. (2013). The role of EPS in fouling and foaming phenomena for a membrane bioreactor, Bioresour. Technol., 147, 184-192. https://doi.org/10.1016/j.biortech.2013.08.026
  4. Laspidou, C.S. and Rittmann, B.E. (2002). A unified theory for extracellular polymeric substances, soluble microbial products, and active and inert biomass, Water Res., 36(11), 2711-2720. https://doi.org/10.1016/S0043-1354(01)00413-4
  5. Lee, S. and Kim, M.H. (2013). Fouling characteristics in pure oxygen MBR process according to MLSS concentrations and COD loadings, J. Memb. Sci., 428, 323-330. https://doi.org/10.1016/j.memsci.2012.11.011
  6. Liu, H. and Fang, H.H. (2002). Extraction of extracellular polymeric substances (EPS) of sludges, J. Biotechnol., 95(3), 249-256. https://doi.org/10.1016/S0168-1656(02)00025-1
  7. Meng, F., Chae, S.R., Drews, A., Kraume, M., Shin, H.S. and Yang, F. (2009). Recent advances in membrane bioreactors (MBRs): membrane fouling and membrane material, Water Res., 43(6), 1489-1512. https://doi.org/10.1016/j.watres.2008.12.044
  8. Meng, F., Yang, F., Xiao, J., Zhang, H. and Gong, Z. (2006). A new insight into membrane fouling mechanism during membrane filtration of bulking and normal sludge suspension, J. Memb. Sci., 285(1-2), 159-165. https://doi.org/10.1016/j.memsci.2006.08.020
  9. Meng, F., Zhang, S., Oh, Y., Zhou, Z., Shin, H.S. and Chae S.R. (2017). Fouling in membrane bioreactors: An updated review, Water Res., 114, 151-180. https://doi.org/10.1016/j.watres.2017.02.006
  10. Menniti, A. and Morgenroth, E. (2010). Mechanisms of SMP production in membrane bioreactors: choosing an appropriate mathematical model structure, Water Res., 44(18), 5240-5251. https://doi.org/10.1016/j.watres.2010.06.040
  11. Ni, B.J., Zeng, R.J., Fang, F., Xie, W.M., Sheng, G.P. and Yu, H.Q. (2010). Fractionating soluble microbial products in the activated sludge process, Water Res., 44(7), 2292-2302. https://doi.org/10.1016/j.watres.2009.12.025
  12. Ramesh, A., Lee, D.J. and Hong, S.G. (2006). Soluble microbial products (SMP) and soluble extracellular polymeric substances (EPS) from wastewater sludge, Appl. Microbiol. Biotechnol., 73(1), 219-225. https://doi.org/10.1007/s00253-006-0446-y
  13. Seviour, R. and Nielsen, P.H. (Eds.). (2010). Microbial Ecology of Activated Sludge. IWA publishing, 2010.
  14. Tian, Y., Chen, L., Zhang, S. and Zhang, S. (2011). A systematic study of soluble microbial products and their fouling impacts in membrane bioreactors, Chem. Eng. J., 168(3), 1093-1102. https://doi.org/10.1016/j.cej.2011.01.090
  15. Zuthi, M.F.R., Ngo, H.H., Guo, W.S., Zhang, J. and Liang, S. (2013). A review towards finding a simplified approach for modelling the kinetics of the soluble microbial products (SMP) in an integrated mathematical model of membrane bioreactor (MBR), Int. Biodeterior. Biodegradation, 85, 466-473. https://doi.org/10.1016/j.ibiod.2013.03.032