Effects of a dynamic membrane formed with polyethylene
glycol on the ultrafiltration of natural organic matter
1.Woongjin R&D Center,
San 4-1, Nakseongdae-dong, Gwanak-gu, Seoul 151-057, Korea; 2.Korea Institute of S&T
Evaluation and Planning, Yangjae-dong, Seocho-gu, Seoul 137-130, Korea; 3.Department of Environmental
Science and Engineering, GIST, 1 Oryong-dong, Buk-gu, Gwangju 500-712,
Korea;
Available online: 2010-06-05
Abstract
The formation of a dynamic membrane (DM) was investigated using polyethylene glycol (PEG) (molecular weight of 35000 g/mol, concentration of 1 g/L). Two natural organic matters (NOM), Dongbok Lake NOM (DLNOM) and Suwannee River NOM (SRNOM) were used in the ultrafiltration experiments along with PEG. To evaluate the effects of the DM with PEG on ultrafiltration, various transport experiments were conducted, and the analyses of the NOM in the membrane feed and permeate were performed using high performance size exclusion chromatography, and the pore size distribution ( PSD) and molecular weight cut off ( MWCO) were determined. The advantages of DM formed with PEG can be summarized as follows: (1) PEG interferes with NOM transmission through the ultrafiltration membrane pores by increasing the retention coefficient of NOM in UF membranes, and (2) low removal of NOM by the DM is affected by external factors, such as pressure increases during UF membrane filtration, which decreases the PSD and MWCO of UF membranes. However, a disadvantage of the DM with PEG was severe flux decline; thus, one must be mindful of both the positive and negative influences of the DM when optimizing the UF performance of the membrane.
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