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Titolo:
Effects of humic substance characteristics on UF performance
Autore:
Lin, CF; Lin, TY; Hao, OJ;
Indirizzi:
Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 10764, Taiwan Natl Taiwan Univ Taipei Taiwan 10764 Environm Engn, Taipei 10764, Taiwan Univ Maryland, Dept Civil Engn, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 ivil Engn, College Pk, MD 20742 USA
Titolo Testata:
WATER RESEARCH
fascicolo: 4, volume: 34, anno: 2000,
pagine: 1097 - 1106
SICI:
0043-1354(200003)34:4<1097:EOHSCO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVATED CARBON ADSORPTION; DISSOLVED ORGANIC-MATTER; SURFACE WATERS; ULTRAFILTRATION; NOM; REMOVAL; NANOFILTRATION; PRETREATMENT; OIL;
Keywords:
ultrafiltration; humic acids; hydrophobicity; molecular weight; activated carbon; flux;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Lin, CF Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 10764, Taiwan Natl Taiwan Univ Taipei Taiwan 10764 Engn, Taipei 10764, Taiwan
Citazione:
C.F. Lin et al., "Effects of humic substance characteristics on UF performance", WATER RES, 34(4), 2000, pp. 1097-1106

Abstract

The role of humic substances in general and hydrophobicity of humic substances in particular on membrane permeate flux is unclear. The main goal of the present study is to evaluate the effect of fractionated humic substanceson ultrafiltration (UF) performance. A commercial humic solution was subjected to a hydrophobic resin for fractionation of the hydrophobic and hydrophilic fraction. These fractions were further fractionated into different molecular wight groups, using gel filtration chromatography. The hydrophobic fraction accounts for 85% organic carbon recovered and has a significantly high THM (trihalomethane) formation potential. or 190 mu g/mg C. The hydrophilic fraction exhibits the worst flux decline despite little solute rejection. The results of molecular weight fractionation of both hydrophobic and hydrophilic fractions further indicate that those molecules with the largest molecular weight (6.5-22.6 kDa) exhibit the worst Aux decline. The UF system evaluated is unable to remove a significant portion of THM precursors, resulting in potentially high THMs in the permeate. The use of powdered activated carbon (PAC) for the pretreatment of hydrophobic/hydrophilic humic substances or in an integrated PAC-UF system exhibits an enhanced membrane fouling. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 21:50:56