Lin, Cheng-FangCheng-FangLinLiu, Shih-HsiangShih-HsiangLiuHao, Oliver J.Oliver J.Hao2009-01-142018-06-282009-01-142018-06-28200100431354http://ntur.lib.ntu.edu.tw//handle/246246/96767https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034978810&doi=10.1016%2fS0043-1354%2800%2900525-X&partnerID=40&md5=c521223de934dc070478b07d0f135147The role of different functional groups present in humic substances on the membrane flux is unclear. This study is undertaken to (1) separate the carboxyl and phenolic groups from a humic solution, and (2) evaluate the effect of each fractionated humic substances on the ultrafiltration (UF) performance. A weak-base amine resin was used for the adsorption (pH7) and the subsequent desorption (pH13) of the phenolic groups from a commercial humic solution. These fractions were evaluated qualitatively (via Fourier transform infrared spectroscopy) and quantitatively (titration); they were further subjected to the analyses of the trihalomethane formation potential (THMFP) and ultrafiltration performance. Although, a complete separation of the phenolic and carboxyl groups is not possible, the results nevertheless provide useful information about their effects on UF performance. The fraction with a higher content of the phenolic OH group exhibits the highest THMFP (190μg/mgC), whereas the fraction with a higher content of the carboxyl groups exhibits more flux decline. The UF system evaluated is unable to remove a significant portion of THM precursors, resulting in high THMs in permeate. The use of powdered activated carbon for the pretreatment of these fractions fails to improve membrane fouling. The pore size of UF membrane does not appear to affect the membrane flux, and the switch from the hydrophobic to hydrophilic membrane only slight improves the permeate flux. Copyright © 2001 Elsevier Science Ltd.application/pdf319024 bytesapplication/pdfen-USCarboxyl group; Flux; Humic acids; Phenolic group; UltrafiltrationActivated carbon; Adsorption; Desorption; Fourier transform infrared spectroscopy; Titration; Humic substances; Ultrafiltration; amine; carboxyl group; functional group; phenol derivative; trihalomethane; water; Activated carbon; Fouling; halogenated hydrocarbon; Ultrafiltration; Water treatment; adsorption; article; controlled study; desorption; Fourier transformation; fractionation; humic substance; hydrophilicity; hydrophobicity; infrared spectroscopy; membrane transport; pH; porosity; priority journal; scanning electron microscopy; ultrafiltrationjournal article113947732-s2.0-0034978810http://ntur.lib.ntu.edu.tw/bitstream/246246/96767/1/21.pdf