Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Coagulated Flocs Broken by the Pressure Pump on Removal Rate and Membrane Fouling of Pressurized MF process

가압펌프에 의해 해체된 플럭이 가압식 막여과 공정의 제거효율 및 막오염에 미치는 영향

  • Kim, Junhyun (Water Quality Research Center, Waterworks Headquarters, Incheon Metropolitan City) ;
  • Moon, Baeksu (Water Quality Research Center, Waterworks Headquarters, Incheon Metropolitan City) ;
  • Park, Jongsu (Water Quality Research Center, Waterworks Headquarters, Incheon Metropolitan City) ;
  • Cho, Yoonho (ECONITY Co., Ltd.) ;
  • Kim, Jinho (ECONITY Co., Ltd.)
  • 김준현 (인천광역시 상수도사업본부 수질연구소) ;
  • 문백수 (인천광역시 상수도사업본부 수질연구소) ;
  • 박종수 (인천광역시 상수도사업본부 수질연구소) ;
  • 조윤호 ((주)에코니티) ;
  • 김진호 ((주)에코니티)
  • Received : 2013.12.16
  • Accepted : 2013.12.24
  • Published : 2013.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

This study reviewed optimum dosage rate of coagulant and ability to remove dissolved organic carbon without sedimentation in conventional water purification plant. It was confirmed that floc formated by pre-treatment process was broken by impeller of booster pump. Optimum dosage rate of coagulant was 4 mg/L (as PACl 17%) for floc formation through blend, coagulation and after passing through the pump when turbidity of raw water was less than 10 NTU. And average removal rate of dissolved organic carbon was 43% at that time. Maximum removal rate of dissolved organic carbon was 48%, even though coagulation rate was increased gradually until 8 mg/L (as PACl 17%). So removal rate of dissolved organic carbon is not much improved even if dosage rage of coagulant increase. TMP of PVDF (polyvinylidene flouride) pressurized MF process without pre-treatment operated at 0.54 bar and TMP of PVDF pressurized MF process with pre-treatment operated at 0.41 bar.

가압식 MF공정의 전처리공정으로 침전지가 없는 혼화/응집공정에서 적정응집제 투입농도선정 및 유기물 제거성능을 평가하였다. 전처리 공정에서 생성된 플럭이 가압펌프의 임펠러에 의해 해체됨을 확인하였으며 원수탁도가 10 NTU 이하로 유입이 될 때, 혼화/응집조와 펌프후단에서 플럭형성을 위한 최적응집제 투입량은 4 mg/L (as PACl 17%)이었다. 이때의 DOC 제거율은 평균 43%이었으며, 응집제투입량을 계속적으로 증가시켜 8 mg/L (as PACl 17%)로 투입을 하였을 때, DOC 제거율은 평균 48%를 나타내어 제거율은 크게 개선되지 않았다. 전처리가 없는 PVDF 가압식 MF공정의 TMP는 0.54 bar에서 운영이 되었으며, 혼화/응집 전처리 공정을 적용하여 운영 시 TMP는 0.41 bar로 안정적인 운영이 가능하였다.

Keywords

References

  1. C. Drozd and J. Schwartzbrod, "Removal of Cryptosporidium from river water by crossflow microfiltration: A pilot-scale study", Wat. Sci. Tech., 35(11-12), 391 (1997).
  2. S. S. Madaeni, "The application of membrane technology for water disinfection", Wat. Res., 33(2), 301 (1999).
  3. L. Fiksdal and T. Leiknes, "The effect of coagulation with MF/UF membrane filtration for the removal of virus in drinking water", J. Membr. Sci, 279, 364 (2006). https://doi.org/10.1016/j.memsci.2005.12.023
  4. S. Xia, J. Nan, R. Liu, and G. Li, "Study of drinking water treatment by ultrafiltration of surface water and its application to China", Desalination, 170, 41 (2004). https://doi.org/10.1016/j.desal.2004.03.014
  5. T. Carroll, S. King, S. R Gray, B. A Bolto, and N. A Booker, "The fouling of microfiltration membranes by NOM after coagulation treatment", Wat. Res., 34(11), 2861 (2000). https://doi.org/10.1016/S0043-1354(00)00051-8
  6. C. F. Lin, T, Y. Lin, and O. J. Hao, "Effect of humic substance characteristics on UF performance", Wat. Res., 34(4), 1097 (2000). https://doi.org/10.1016/S0043-1354(99)00273-0
  7. A. I. Schafer, U. Schwicker, M. M. Fischer, A. G. Fane, and T. D. Waite, "Microfiltration of colloids and natural organic matter", J. Membr. Sci, 171(2), 151 (2000). https://doi.org/10.1016/S0376-7388(99)00286-0
  8. H. C. Kim and M. J. Yu, "Characterization of natural organic matter in conventional water treatment processes for selection of treatment processes focused on DBPs control", Wat. Res. 39(19), 4779 (2005). https://doi.org/10.1016/j.watres.2005.09.021
  9. H. Zhang, J. Qu, H. Liu, and X. Zhao, "Isolation of dissolved organic matter in effluents from sewage treatment plant and evaluation of the influences on its DBPs formation", Sep Purif Technol., 64, 31 (2008). https://doi.org/10.1016/j.seppur.2008.08.011
  10. S. E. Kim, Y. H. Gu, M. J. Yu, H. S. Chang, S. W. Lee, and S. H. Han, "Characterization of NOM behavior and DBPs formation in water treatment processes", Journal of the Korean society of water and wastewater, 21(4), 395 (2007).
  11. Y. J. Kim, Y. S. Jin, P. S. Sin, and K. S. Hyun, "A study on the production and control of DBPs in drinking water treatment", Journal of the Korean society of water and wastewater, 12(1), 75 (2004).
  12. J. H. Kim, "Physicochemical Effect on Permeate Flux in a Hybrid Ozone-Ceramic Ultrafiltration Membrane Treating Natural Organic Matter", Membrane Journal, 18(4), 354 (2008).
  13. J. D. Lee, S. H. Lee, M. H. Jo, P. K. Park, C. H. Lee, and J. W. Kwak, "Effect of coagulation conditions on membrane filtration characteristics in coagulation- microfiltration process for water treatment", Environ. Sci. Technol., 34, 3780 (2000). https://doi.org/10.1021/es9907461
  14. J. L. Lim, K. H. Lee, Y. J. Lee, and J. Y. Park, "Optimum Coagulation Conditions for Ceramic Microfiltration Membrane Process", Membrane Journal, 22(2), 135 (2012).
  15. Y. T. Lee and J. K. Oh, "Membrane Fouling Effect with Organic-Inorganic Materials Using the Membrane Separation in Drinking Water Treatment Process" Membrane Journal, 13(4), 219 (2003).
  16. J. D. Kim, K. W. Park, and C. H. Park, "Application of Water Treatment with Membrane in Seomjin River", Membrane Journal, 23(1), 12 (2013).
  17. H. J. Yang, Y. G. Son, H. K. Chun, and S. Y. Han, "Comparison of Low pressure membrane process and conventional", Joint Spring Conference of Korean Society on Water & Wastewater and Korean Society on Water Environment, F-14, 90 (2005).
  18. T. Y. Kim and H. K. Park, "Controlling floc sizes in a pipe between pump and membrane inlet", Desalination, 249, 960 (2007).
  19. J. H. Kim, C. H. Lee, E. J. Lee, K. H. Lee, S. B. Kwon, H. S. Park, H. S. Kim, and A. Jang, "The effect of re-aggregated floc by additional coagulant on membrane", Journal of the Taiwan Institute of Chemical Engineers, 44, 802 (2013). https://doi.org/10.1016/j.jtice.2013.01.026
  20. Y. H. Choi, H. S. kim, and J. H. Kweon, "Role of hydrophobic natural organic matter flocs on the fouling in coagulation-membrane processes", Sep. Purif Technol., 62, 529 (2008). https://doi.org/10.1016/j.seppur.2008.03.001
  21. W. Xu, B. Gao, R. Mao, and Q. Yue, "Influence of floc size and structure on membrane fouling in coagulation-ultrafiltration hybrid process-The role of Al13 species", J Hazard Mater, 193, 249 (2011). https://doi.org/10.1016/j.jhazmat.2011.07.057