Heavy metal binding to digested sludge

The interactions of heavy metals with anaerobically digested sludges and with digested sludge which had been washed with EDTA have been examined by equilibrating the sludge solids with solutions containing zinc acetate, lead acetate, ferrous sulphate and chromic chloride. This equilibration has been...

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Bibliographic Details
Published in:Water research (Oxford) 1985, Vol.19 (12), p.1483-1488
Main Authors: Alibhai, K.R.K., Mehrotra, I., Forster, C.F.
Format: Article
Language:English
Subjects:
adsorption
Applied sciences
binding series
digested sludge
Exact sciences and technology
heavy metals
isotherms
Other industrial wastes. Sewage sludge
Pollution
sorption constants
Wastes
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Summary:The interactions of heavy metals with anaerobically digested sludges and with digested sludge which had been washed with EDTA have been examined by equilibrating the sludge solids with solutions containing zinc acetate, lead acetate, ferrous sulphate and chromic chloride. This equilibration has been studied at 20 and 35°C. Langmuir and Freundlich isotherms were used to describe the metal binding behaviour of the solids. The linear part of the isotherm was obtained by regression analysis and conditional adsorption constants were calculated from the slope of these lines. These calculations suggested that, under the conditions used in this work, the mechanism of attachment was predominantly one involving metal/surface ligand interactions. Attachment series, based on the various constants, are reported and lead the authors to question the suitability of such series for describing the binding of metals relative to one another.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(85)90393-8