Rapid Small-Scale Column Tests on the Adsorption of Arsenate by Cationic Surfactant-Modified GAC
Publication: Journal of Environmental Engineering
Volume 138, Issue 8
Abstract
Cationic surfactants were employed to modify granular activated carbon (GAC) for the purpose of improving GAC’s adsorption of arsenate from water. Rapid small-scale column tests (RSSCTs) were set up to test the adsorption capacities. Results indicated that surfactant cetyltrimethylammonium chloride (CTAC) modification manifested the highest improvement in GAC’s adsorption for arsenate. GAC modified by of CTAC was able to operate approximately 64,000 bed volumes before of arsenate breakthrough as compared with 2,100 bed volumes for virgin GAC. GAC also performed much better than zeolite and bentonite both in surfactant retention and arsenic removal. Arsenate adsorption was affected by influent concentration, pH, and presence of other anions. The effect of competitive anions on arsenate adsorption was in the order of . Breakthrough tests on tap water spiked with arsenate indicated that the modified GAC had high selectivity for arsenate and considerable amount of arsenate was removed though the influent contained interfering anions and total organic carbon (TOC) in concentrations of magnitude higher than that of arsenate.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (51078233), the Shanghai Pujiang Program (10PJ1407900), and the Innovation Program of Shanghai Municipal Education Commission (11YZ115).
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 138 • Issue 8 • August 2012
Pages: 880 - 885
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jun 29, 2011
Accepted: Feb 2, 2012
Published online: Feb 4, 2012
Published in print: Aug 1, 2012
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