Characterization of organic fouling on cellulose acetate membrane during microfiltration of secondary effluent and model solutions
二级出水微滤过程中对醋酸纤维素酯膜的有机污染特征

Low pressure membrane technology,including microfiltration and ultrafiltration,is being applied more and more in the wastewater reclamation.However,membrane fouling,especially fouling resulted from organic materials,stays a technical obstacle.In this study,the filtration experiments were performed with cellulose acetate microfiltration membrane,under constant-flux filtration mode.Secondary effluent organic matter(EfOM for short),EfOM fractions based on hydrophilic-hydrophobic property,model protein solution(BSA),humic acid were used for microfiltration experiments.Based up on the observation by using ATR-FTIR and XPS,humic acid possesses the least fouling potential among all organics used.In terms of functional groups,ATR-FTIR suggests that more amide(1 535 cm-1),aliphatic C-H(2 860~2 970 cm-1),and hydroxyl(3 400 cm-1)on membrane surfaces after filtration of BSA,EfOM,and hydrophobic part of EfOM.Comparing TMP/V,hydrophobic-basic EfOM possesses the greatest fouling potential and humic acid possesses the least fouling potential.And UVA and EEM results suggest that hydrophobic-basic EfOM and protein contributes a lot to cellulose acetate membrane fouling.