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KMID : 1024520160250020231
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Journal of the Environmental Sciences
2016 Volume.25 No. 2 p.231 ~ p.238
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Evaluations of Coagulation Process for Membrane Pre-treatment using Floc Growth Rate Analyzer
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Son Hee-Jong
Kim Sang-Goo
Kim Do-Hwan
Kang So-Won
Choi Young-Ik
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Abstract
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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.
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KEYWORD
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Membrane process, Coagulation, Flocculation intensity, Floc size index (FSI), Membrane pore size
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