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Original Articles

Sorption of Alkyl Benzyl Dimethyl Ammonium Compounds by Activated Sludge

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Pages 739-744 | Received 26 Sep 2005, Accepted 28 Sep 2005, Published online: 06 Feb 2007
 

Abstract

The adsorption isotherms on activated sludge from wastewater treatment plants and the surface properties in aqueous solution of alkyl benzyl dimethyl ammonium compounds have been investigated. Langmuir and Freundlich adsorption isotherms described satisfactorily the equilibrium adsorption of these cationic surfactants on activated sludge. Adsorption on sludge as well as the affinity of these compounds to be adsorbed in the liquid/gas interface increased with increasing the alkyl chain length in the cationic surfactant molecule. Water hardness decreased the critical micelle concentration values of the alkyl benzyl dimethyl ammonium homologues tested and the extent of their sorption to activated sludge.

Acknowledgments

This work was financed by the Ministerio de Ciencia y Tecnología (PPQ2001–2322)

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