Browse > Article

The Characterization of Floc Formation Under Various Pre-coagulation Conditions  

Jung, Chul-Woo (Ulsan Regional Innovation Agency, Ulsan Industry Promotion Techno Park)
Son, Hee-Jong (Water Quality Institute, Water Authority)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.11, 2008 , pp. 1139-1145 More about this Journal
Abstract
The objectives of this research are to investigate the mechanism of coagulation affecting UF and find out the optimum conditions of the combined of coagulation with UF membrane filtration for NOM removal. During the mixing period, substantial changes in particle size distribution occurred under rapid and slow mixing condition due to the simultaneous formation of microflocs and NOM precipitates. Therefore, combined pretreatment using coagulation (both rapid mixing and slow mixing) improved dissolved removal efficiency. Also, for combined coagulation to membrane process, flux reduction rate showed lower than only UF process. The rate of flux decline for the hydrophobic membrane was considerably greater than for the hydrophilic membrane. 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.
Keywords
Coagulation; Microfloc; Membrane; NOM; Flux;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Dykes, G. M. and Conlon, W. J., "Use of membrane technology," J. AWWA, 81(11), 43-46(1989)
2 Jacangelo, J. G., Aieta, E. M., Carns, K. E., Cummings, E. W., and Mallevialle, J., "Assessing Hollow-Fiber Ultrafiltration for particulate Removal," J. AWWA, 87(11), 68-75(1995)   DOI
3 Wei, Y. and Andrew, L. Z., "Humic acid fouling during microfiltration," J. Membr. Sci., 157, 1-12(1999)   DOI   ScienceOn
4 Jang, N. Y., Watanabe, Y., Minegishi, S., and Bian, R., "The evaluation of dead-end ultrafiltration membrane process combined with pre-coagulation/sedimentation," J. JWWA, 70(2), 1-14(2001)
5 Mhaisalkar, V. A.. Paramasivam, R., and Bhole, A. G., "Optimizing physical parameters of rapid mix design for coagulation-flocculation of turbid waters," Water Res., 25(1), 43-52(1991)   DOI   ScienceOn
6 Taylor, J. S., Mulford, A., Duranceau, S. J., and Barrentt, W. M., "Cost and performance of a membrane pilot plant," J. AWWA, 81(11), 52-60(1989)
7 Bian, R., Watanabe, Y., Tambo, N. and Ozawa, G., "Removal of humic substances by UF and NF membrane systems," Water Sci. Technol., 40(9), 121-129(1999)
8 Watanabe, Y., Kasahara, S., and Iwasaki, Y., "Enhanced flocculation/sedimentation process by a jet mixed seperator," Water Sci. Technol., 37(10), 55-67(1998)
9 김은주, 정철우, 최시환, 강임석, "정수공정시 급속혼화조건이 응집효율에 미치는 영향," 대한환경공학회지, 23(4), 631-640(2001)
10 Jonsson. A. S. and Jonsson. B., "The influnce of nonionic and ionic surfactants on hydrophobic and hydrophilic ultrafiltration membranes," J. Membr. Sci., 56, 49-76(1991)   DOI   ScienceOn
11 Fane, A. G. and Fell, C. J. D., "A review of fouling and fouling control in ultrafiltration," Desalination, 62, 117-136(1987)   DOI   ScienceOn
12 Edward, J. B., Goel, S., and Hozalski, R. M., "Removal of natural organic matter in Biofilters," AWWA Research Foundation and American Water Works Association(1995)
13 Snoeyink, V. L. and Jenkins, D., Water Chemistry, John Wiley and Sons, NY(1982)
14 Chang, Y. J., Choo, K. H., Benjamin, M. M., and Reiber, S., "Combined adsorption-UF process increases TOC removal," J. AWWA, 90(5), 90-102(1998)
15 AWWA Membrane Technology Research Committee, 1998 Committee Report; Membrane Process, J. AWWA, 90(6). 91-105(1998)
16 Jang, N. Y., Watanabe, Y., and Ozawa, G., "The study on microfiltration membrane process combined with preozonation," J. JWWA, 71(2), 1-13(2002)
17 Amirtharajah, A., "Rapid mixing and the coagulation process," Proceedings of AWWA Annual Conference, Kansas(1987)
18 Douglas, M. O., Gary, L. A., and Chowdhury, Z. K., "Characterization of natural organic matter and its relationship to treatability," AWWA Research Foundation and American Water Works Association(1993)
19 Conlon, W. J., Hornburg, C. D., Waston, B. M., and Kedfer, C. A., "Membrane softening: The concept and its application to muncipal water supply," Desalination, 78, 157-175(1990)   DOI   ScienceOn
20 Fu, L. F. and Dempsey, B. A., "Modeling the effect of particle size and charge on the structure of filter cake in ultrafiltration," J. Membrane. Sci., 149, 221-240(1998)   DOI   ScienceOn
21 Gregory, J. and Duan, J., "Hydrolysing metal salts as coagulants," Pure Appl. Chem., 73(11), 1-10   DOI   ScienceOn
22 Jung, C. W., Son, H, J., and Kang, L. S., "Effects of membrane material and pretreatment coagulation on membrane fouling: fouling mechanism and NOM removal," Desalination, 197, 154-164(2006)   DOI   ScienceOn
23 Jones, K. L. and O'Melia, C. R., "Ultrafiltration of protein and humic substances; effect of solution chemistry on fouling and flux decline," J. Membr. Sci., 193, 163-173(2001)   DOI   ScienceOn