Determination of Optimal Coagulation Condition for Coagulation-UF Water Treatment Process

응집-UF 정수공정을 위한 칠적응집조건의 결정

  • Lee, Chul-Woo (Department of Environmental Engineering, Pukyong National University) ;
  • An, Su-Kyong (Department of Environmental Engineering, Pukyong National University) ;
  • Kang, Lim-Seok (Department of Environmental Engineering, Pukyong National University)
  • Published : 2005.08.31

Abstract

Applying coagulation process before membrane filtration showed not only reducing membrane fouling, but also improving the removal of dissolved organic materials that might otherwise not be removed by the membrane alone. Also, slow mixing didn't affect the reduction of membrane fouling, and rapid mixing using an in-line static mixer was more effective than using backmixer. In addition, only 11 percent of dissolved organic matter in raw water was the primary cause of fouling. Furthermore, tile primary foulant of UF membrane was hydrophobic substance, which can easily be removed by coagulation.

응집-UF 정수공정시 응집 전처리 공정에 있어 완속혼합없이 급속혼화만으로 충분한 응집의 효과를 기대할 수 있으며, 급속혼화장치로 in-line static mixer를 사용한 경우가 기존의 back mixer를 사용 한 경우보다 롤은 DOC 제거효율을 얻을 수 있었다. 또한, 적정 주입량인 16 mg alum/L에서 막의 투과 flux 감소가 가장 적게 나타났으며 적정 주입량보다 너무 적거나 또는 너무 많은 경우 모두 막의 투과 fiux 감소가 크게 나타났다. 또한 막의 fouling에 크게 영향을 미치는 것은 hydrophobic 물질로 이는 응집 전처리시 효과적으로 제거되어짐으로써 막의 투과 flux 감소를 줄일 수 있었다.

Keywords

References

  1. Desalination v.102 The use of membrane filtration in conjuetion wiith coagulation processes for improved NOM removal James, C.V.;Mark, A.T.;Uday, G.K. https://doi.org/10.1016/0011-9164(95)00041-Y
  2. J. AWWA v.82 no.12 Ultrafiltration of lake water : effect of pretreatment on the partitioning of organics, THM formatian potential, and flux Laine, J.M.;Clark, M.M.;Mallevialle, J.
  3. Environ. Sci. Technol. v.34 no.17 Effect of coagulalion conditions on membrane filtration characteristic in coagulation-microfdtration process for water treatment Lee, J.D.;Lee, S.H.;Jo, M.H.;Park, P.K.;Lee, C.H.;Kwak. J.W. https://doi.org/10.1021/es9907461
  4. Water Sci. & Tech. v.27 no.11 Removal of dissolved hydrophobic and hydrophilic organic substances during coagulation/flocculation of surface wastes Croue, J.P.;Lfebvre. E.;Martin, B.;Legube, B.
  5. Water Res. v.25 no.1 Optimizing physical parameters of rapid mixing design for coagulation-flocculation of turbid waters Mhaisalkar, V.A.;Paramasivam, R.;Bhole, A.G. https://doi.org/10.1016/0043-1354(91)90097-A
  6. 상하수도학회지 v.17 no.3 응집공정에 적합한 In-Line 정적혼화기를 이용한 혼화공정의 개선 정철우;강민수;최시환;정수일;손인식;강임석
  7. 정수공정 개선을 위한 급속혼화조건에 대한 연구 최시환
  8. 정수공정에서 유기물질의 제거를 위한 응집 - 한외여과(UF)막분리 공정의 적용 정철우
  9. Water Sci. Technol. v.40 no.9 Removal of humic substances by UF and NF membrane systems Bian, R.;Watanabe, Y.;Ozawa, G.;Tambo, N.
  10. Coagulation pretreatment for membrane filtration;AWWA report foundation Howe, K.J.;Clark, M.M.
  11. J Membr. Sci. v.97 no.27 Adsorption of aquatic htunic substances on hydrophobic ultrafiltration membranes Jucker, C.;Clark, M.M. https://doi.org/10.1016/0376-7388(94)00146-P
  12. J. Membr. Sci. v.171 no.30 Microtiltration of colloids and natural organic matter Schafer, A. I.;Schwicker, U.;Fischer, M.M.;Fane, A.G.;Waite, T.D. https://doi.org/10.1016/S0376-7388(99)00286-0
  13. J. AWWA v.88 no.5 Influence of NOM composition on nanofiltration Nilson, J.A.;DiGiano, F.A.