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http://dx.doi.org/10.5322/JESI.2016.25.2.231

Evaluations of Coagulation Process for Membrane Pre-treatment using Floc Growth Rate Analyzer  

Son, Hee-Jong (Water Quality Institute, Busan Water Authority)
Kim, Sang-Goo (Water Quality Institute, Busan Water Authority)
Kim, Do-Hwan (Water Quality Institute, Busan Water Authority)
Kang, So-Won (Department of Bio-chemical Engineering, Friedrich-Alexander University)
Choi, Young-Ik (Department of Environmental Engineering, Dong-A University)
Publication Information
Journal of Environmental Science International / v.25, no.2, 2016 , pp. 231-238 More about this Journal
Abstract
In this study, we have investigated to find optimal pre-treatment flocculation condition by analyzing the floc growth rate with mixing conditions and the membrane permeation flux for pre-treatment step of the membrane process. The higher mixing intensity showed a constant floc size index (FSI) values, and lower mixing intensity increased the degree of dispersion of the FSI values. Results of comparing the distribution characteristics of the FSI value and the permeation flux were more effective in increasing flux when the FSI values were 0.2 or higher. The degree of dispersion of FSI was relatively large in 40 rpm mixing condition compared to 120 rpm. In 40 rpm mixing condition, it decreased the permeation flux compared to 120 rpm because various sizes of flocs were distributed. Coagulation-UF membrane process enhanced 30%~40% of the flux rate compare to UF alone process, and the coagulation-MF process increased up to 5% of the flux rate compare to MF alone process. Pre-treatment, that is, coagulation process, has been found to be less effects on relatively larger pore size for MF membrane. For UF membrane, the flux was a little bit same when applying only the rapid mixing process or rapid mixing with slow mixing processes together. In case of MF membrane, the flux was improved when rapid mixing process applied with slow mixing process together.
Keywords
Membrane process; Coagulation; Flocculation intensity; Floc size index (FSI); Membrane pore size;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Aoustin, E., Schafer, A. I., Fane, A. G., Waite, T. D., 2001, Ultrafiltration of natural organic matter, Sep. Purif. Technol., 22(23), 63-78.
2 Chang, H., Qu, F., Liu, B., Yu, H., Li, K., Shao, S., Li, G., Liang, H., 2015, Hydraulic irreversibility of ultrafiltration membrane fouling by humic acid: effects of membrane properties and backwash water composition, J. Membr. Sci., 493, 723-733.   DOI
3 Fan, L. H., Nguyen, T., Roddick, F. A., Harris, J. L., 2008, Low-pressure membrane filtration of secondary effluent in water reuse: pre-treatment for fouling reduction, J. Membr. Sci., 320, 135-142.   DOI
4 Fitzpatrick, C. S. B., Fradin, E., Gregory, J., 2004, Temperature effects on flocculation, using different coagulants, Water Sci. Technol., 50(12), 171-175.
5 Gregory, J., 2004, Monitoring floc formation and breakage, Water Sci. Technol., 50(12), 163-170.
6 Gregory, J., Nelson, D. W., 1986, Monitoring of aggregates in flowing suspensions, Colloids Surf., 18, 175-188.   DOI
7 Jung, C. W., Son, H. J., 2008, The evaluation of fouling mechanism on cross flow precoagulation-UF process, Kor. Chem. Eng. Res., 46(3), 639-645.
8 Jung, C. W., Son, H. J., Kang, L. S., 2006, Effects of membrane material and pretreatment coagulation on membrane fouling: fouling mechanism and NOM removal, Desalination, 197, 154-164.   DOI
9 Jung, C. W., Kang, L. S., 2003, Application of combined coagulation-ultrafiltration membrane process for water treatment, Kor. J. Chem. Eng., 20(5), 855-866.   DOI
10 Kwon, D. Y., Vigneswaran, S., Fane, A. G., Bem Aim, R., 2000, Experimental determination of critical flux in cross-flow microfiltration, Sep. Purif. Technol., 19, 169-181.   DOI
11 Son, H. J., Hwang, Y. D., Roh, J. S., Ji, K. W., Sin, P. S., Jung, C. W., Kang, L. S., 2005, Application of MIEX pre-treatment for ultrafiltration membrane process for NOM removal and fouling reduction, Water Sci. Technol.: Water Suppl., 5(5), 15-24.
12 Son, H. J., Yoom, H. S., Kim, S. G., Seo, C. D., Hwang, Y. D., 2014, Evaluation of coagulation characteristics of Fe(III) and Al(III) coagulant using on-line monitoring technique, J. Environ. Sci. Intl., 23(4), 715-722.   DOI
13 Yu, W., Graham, N. J. D., 2015, Performance of an intergrated granular media - ultrafiltration membrane process for drinking water treatment, J. Membr. Sci., 492, 164-172.   DOI