Document Detail

Impact of feed water acidification with weak and strong acids on colloidal silica fouling in ultrafiltration membrane processes.
MedLine Citation:
PMID:  17709127     Owner:  NLM     Status:  MEDLINE    
Although acidification of feed water is a common practice to prevent scaling of the sparingly soluble minerals in nanofiltration and reverse osmosis processes, the change of acidity may have a potentially adverse impact on colloidal fouling, which is another important type of fouling on the membranes. In this paper, commonly used strong and weak acids are quantitatively investigated for their effect on colloidal silica fouling with a lab-scale ultrafiltration (UF) membrane system. Experiments showed that addition of either strong or weak acids in feed water would intensify colloidal fouling. However, the strength of colloidal fouling with strong acid addition was consistently higher (12-37%) than that with weak acid addition at pH 3. The smaller increase in colloidal fouling potential observed with weak acids was attributed to the adsorption of weak acid anions on the colloidal silica surface, which kept the absolute value of zeta potential of the colloids relatively high. Consequently, the difference in colloidal fouling potential with the additions of strong and weak acids diminished at high salt concentration. The findings implied that the type of acid used in feed water acidification could have a significant impact on colloidal fouling for low-salinity waters.
Gurdev Singh; Lianfa Song
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Publication Detail:
Type:  Journal Article     Date:  2007-08-06
Journal Detail:
Title:  Water research     Volume:  42     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-01-24     Completed Date:  2008-06-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  707-13     Citation Subset:  IM    
Division of Environmental Science & Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
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MeSH Terms
Acids, Noncarboxylic / chemistry*
Equipment Failure Analysis
Hydrogen-Ion Concentration
Osmolar Concentration
Silicon Dioxide / chemistry*
Ultrafiltration / instrumentation
Waste Disposal, Fluid / instrumentation
Water Purification / instrumentation*
Reg. No./Substance:
0/Acids, Noncarboxylic; 0/Colloids; 7631-86-9/Silicon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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