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Titolo:
The effects of pH and calcium on the diffusion coefficient of humic acid
Autore:
Wang, YG; Combe, C; Clark, MM;
Indirizzi:
Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 l & Environm Engn, Urbana, IL 61801 USA
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 1, volume: 183, anno: 2001,
pagine: 49 - 60
SICI:
0376-7388(20010228)183:1<49:TEOPAC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEMBRANES; POLYSTYRENE; SUBSTANCES; SIZE;
Keywords:
humic acid; diffusion coefficient; calcium concentration; pH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Clark, MM Univ Illinois, Dept Civil & Environm Engn, 205 N Mathews Ave, Urbana, IL 61801 USA Univ Illinois 205 N Mathews Ave Urbana IL USA 61801 IL 61801 USA
Citazione:
Y.G. Wang et al., "The effects of pH and calcium on the diffusion coefficient of humic acid", J MEMBR SCI, 183(1), 2001, pp. 49-60

Abstract

Humic acid is a major component of natural organic matter in surface waterand can cause serious fouling problems in membrane filtration processes for drinking water treatment. The transport of humic acid to the membrane surface and within membrane pores is related to its diffusivity. Thus. the diffusion coefficient of humic acid is an important mass transport parameter. Clark and Lucas [J. Membr. Sci. 143 (1998) 13-25] studied the diffusion andpartitioning of humic acid into a porous ultrafiltration membrane and developed a model to predict how humic acid diffusivity changes under differentpH and calcium concentration conditions. In this work, the diffusion coefficient of humic acid was directly measured and compared to the predictions of the Clark and Lucas model. The experiments were conducted in a two-chamber diffusion cell separated by a track-etched membrane. The results show that the diffusivity of humic acid increases with decreasing pH and increasing calcium concentration, which can be explained by the compaction of humic acid molecules at low pH and high ionic strength. The experimental measurements strongly support the predictions of the Clark and Lucas model. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 00:35:00