Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9681133 | Desalination | 2005 | 11 Pages |
Abstract
Natural organic matter (NOM) plays a significant role in fouling of ultrafiltration membranes in drinking water treatment processes. The aim of this study was to obtain a better understanding of the interactions between the fractional components of NOM and a hydrophilic PES/PVP hollow fiber ultrafiltration membrane (150-200 kDa). NOM was fractionated into hydrophobic, transphilic and hydrophilic acid fractions according to the XAD-8/4 resin method proposed by Aiken et al. [1]. UF filtration tests were performed with diluted NOM fractions (1.5 mg/l DOC) isolated from surface water (Lake Ijssel). From NOM fractionation results, Lake IJssel water comprised about 53-55% hydrophobic, 20-22% hydrophilic and 25% transphilic NOM acids. Filtration of three NOM fractions (hydrophobic, hydrophilic and transphilic) suggested that the fouling potential was in the order: hydrophilic > hydrophobic > transphilic. The reversibility of fouling due to the hydrophilic fraction was very poor, and decreased from ca. 50% in the first cycle to <30% after 6 cycles. LC-OCD (Liquid Chromatography-Organic Carbon Detection) analyses of UF feed and permeate showed almost no rejection of humic acids (20,000â¼1,000 Da), IOW molecular weight acids (< 350 Da) or neutrals/amphiphilic compounds (<350 Da). The absence of a polysaccharide peak (Mw>20,000 Da) in the LC-OCD chromatogram of the UF permeate, suggested that polysaccharides (> 20,000 Da) were rejected by the UF membrane and may have contributed to fouling.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Maria D. Kennedy, Hyoung K. Chun, Victor A. Quintanilla Yangali, Bas G.J. Heijman, Jan C. Schippers,