상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제33권2호
  • /
  • Pages.111-119
  • /
  • 2019
  • /
  • 1225-7672(pISSN)
  • /
  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
권호 표지
DOI QR코드

DOI QR Code

EC-MBR 공정의 MLSS, 전류밀도 및 접촉시간이 막 오염 감소에 미치는 영향 모델링

Modeling of the effect of current density and contact time on membrane fouling reduction in EC-MBR at different MLSS concentration

  • 김완규 (호서대학교 안전환경기술융합학과) ;
  • 장인성 (호서대학교 환경공학과)
  • Kim, Wan-Kyu (Department of Convergence Technology for Safety and Environment, Hoseo University) ;
  • Chang, In-Soung (Department of Environmental Engineering, Hoseo University)
  • 투고 : 2018.12.07
  • 심사 : 2019.01.21
  • 발행 : 2019.04.15
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Electro-coagulation process has been gained an attention recently because it could overcome the membrane fouling problems in MBR(Membrane bio-reactor). Effect of the key operational parameters in electro-coagulation, current density(${\rho}_i$) and contact time(t) on membrane fouling reduction was investigated in this study. A kinetic model for ${\rho}_i$ and t required to reduce the membrane fouling was suggested under different MLSS(mixed liquor suspended solids) concentration. Total 48 batch type experiments of electro-coagulations under different sets of current densities(2.5, 6, 12 and $24A/m^2$), contact times(0, 2, 6 and 12 hr) and MLSS concentration(4500, 6500 and 8500mg/L) were carried out. After each electro-coagulation under different conditions, a series of membrane filtration was performed to get information on how much of membrane fouling was reduced. The membrane fouling decreased as the ${\rho}_i$ and t increased but as MLSS decreased. Total fouling resistances, Rt (=Rc+Rf) were calculated and compared to those of the controls (Ro), which were obtained from the experiments without electro-coagulation. A kinetic approach for the fouling reduction rate (Rt/Ro) was carried out and three equations under different MLSS concentration were suggested: i) ${\rho}_i^{0.39}t=3.5$ (MLSS=4500 mg/L), ii) ${\rho}_i^{0.46}t=7.0$ (MLSS=6500 mg/L), iii) ${\rho}_i^{0.74}t=10.5$ (MLSS=8500 mg/L). These equations state that the product of ${\rho}_i$ and t needed to reduce the fouling in certain amounts (in this study, 10% of fouling reduction) is always constant.

키워드

참고문헌

  1. AI-Malack, M.H. and AI-Nowaiser, W.K. (2018). Treatment of synthetic hypersaline produced water employing electrocoagulation-membrane bioreactor (EC-MBR) process and halophilic bacteria, J. Environ. Chem. Eng., 6(2), 2442-2453. https://doi.org/10.1016/j.jece.2018.03.049
  2. Bani-Melhem, K.B. and Smith, E. (2012). Grey water treatment by a continuous process of an electrocoagulation unit and a submerged membrane bioreactor system, Chem. Eng. J., 198-199, 201-210. https://doi.org/10.1016/j.cej.2012.05.065
  3. Bani-Melhmm, K. and Elektorowicz, M. (2011). Performance of the submerged membrane eletro-bioreactor(SMEBR) with iron electrodes for wastewater treatment and fouling reduction, J. Membr. Sci., 379(1-2), 434-439. https://doi.org/10.1016/j.memsci.2011.06.017
  4. Beyer, M., Lohregel, B. and Nghiem, L.D. (2010). Membrane fouling and chemical cleaning in water recycling applications, Desalination, 250(3), 911-981.
  5. Han, S. and Chang, I.S. (2014). Comparison of the cake layer removal options during determination of cake layer resistance (Rc) in the resistance-in-series model, Sep. Sci. Technol., 49(16), 2459-2465. https://doi.org/10.1080/01496395.2014.937005
  6. Hua, L.C., Huang, C., Su, Y.C., Nguten, T.N.P. and Chen, P.C. (2015). Effects of electro-coagulation on fouling mitigation and sludge characteristics in a coagulation-assisted membrane bioreactor, J. Membr. Sci., 495, 29-36. https://doi.org/10.1016/j.memsci.2015.07.062
  7. Ibedi, S., Elektorowicz M. and Oleszkiewicz, J.A. (2015). Electro-conditioning of activated sludge in a membrane electro-bioreactor for improved dewatering and reduced membrane fouling, J. Membr. Sci., 494(15), 136-142. https://doi.org/10.1016/j.memsci.2015.07.051
  8. Kim, W.K. and Chang, I.S. (2018). Membrane fouling reduction using electro-coagulation aided membrane bio-reactor, J. Korea Academia-Ind. Cooperation Soc., 19(8), 105-114.
  9. Kobya, M. and Demibas, E. (2015). Evaluations of operating parameters on treatment of can manufacturing wastewater by electro-coagulation, J. Water Proc. Eng., 8, 64-74. https://doi.org/10.1016/j.jwpe.2015.09.006
  10. Mang, F., Liao, B., Liang, S., Yang, F., Zhang, H. and Song, L. (2010). Morphological visualization, componential characterization and microbiological identification of membrane fouling in membrane bioreactors (MBRs), J. Membr. Sci., 361(1-2), 1-14. https://doi.org/10.1016/j.memsci.2010.06.006
  11. Moussa, D.T., El-Nass, M.H., Nasser, M. and Al-Marri, M.J. (2017). A comprehensive review of electro-coagulation for water treatment: Potentials and challenges, J. Environ. Manag., 186(1), 24-41. https://doi.org/10.1016/j.jenvman.2016.10.032
  12. Nahm, C.H., Choi, D.C., Kwon, H., Lee, S., Lee, S.H., Lee, K., Choo, K.H., Lee, J.K., Lee, C.H. and Park, P.K. (2017). Application of quorum quenching bacteria entrapping sheets to enhance biofouling control in a membrane bioreactor with a hollow fiber module, J. Membr. Sci., 526, 264-271. https://doi.org/10.1016/j.memsci.2016.12.046
  13. Park, H.D., Chang, I.S. and Lee, K.J. (2015). Principles of membrane bioreactor for wastewater treatment, CRC Press, Taylor & Francis Group, New York, 242-245.
  14. Um, S.E. and Chang, I.S. (2017). Effect of current density and contact time on membrane fouling in electrocoagulation-MBR and their kinetic studies on fouling reduction rate, J. Korean Soc. Water Wastewater, 31(4), 321-328. https://doi.org/10.11001/jksww.2017.31.4.321
  15. Weerasekara, N.A., Choo, K.H. and Lee, C.H. (2016). Bio-fouling control: bacterial quorum quenching versus chlorination in membrane bioreactors, Water Res., 103, 293-301. https://doi.org/10.1016/j.watres.2016.07.049