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Removal of Heavy Metals from Waste Waters by Natural and Na-Exchanged Bentonites

Published online by Cambridge University Press:  01 January 2024

E. Álvarez-Ayuso  and
A. García-Sánchez
E. Álvarez-Ayuso
Affiliation:
Department of Environmental Geochemistry, IRNASA, CSIC, Apto 257, Salamanca, Spain
A. García-Sánchez*
Affiliation:
Department of Environmental Geochemistry, IRNASA, CSIC, Apto 257, Salamanca, Spain
*
*E-mail address of corresponding author: misfis@gugu.usal.es
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Abstract

Batch sorption studies of Cr(III), Ni(II), Zn(II), Cu(II) and Cd(II) were conducted on Ca-bentonite and Na-bentonite to determine their retention capacities for these metal cations commonly present in the waste waters of galvanic industries. The Langmuir model was found to describe the sorption process well, offering maximum sorption capacities of 44.4 mg Cr/g, 6.32 mg Ni/g, 5.75 mg Zn/g, 7.72 mg Cu/g, 7.28 mg Cd/g on Ca-bentonite and 49.8 mg Cr/g, 24.2 mg Ni/g, 23.1 mg Zn/g, 30.0 mg Cu/g, 26.2 mg Cd/g on Na-bentonite. The use of Na-bentonite in the purification of waste waters from Ni, Cr and acid-Zn electroplating processes was an effective treatment in small-scale and in semi-industrial-scale tests. This proves the worth of this method as an alternative to existing methods. In contrast, Nabentonite was not effective in Zn sorption from cyanide-containing waste waters.

Keywords

BentoniteHeavy MetalsPurificationSorptionWaste Waters
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 5 , October 2003 , pp. 475 - 480
Copyright
Copyright © 2003, The Clay Minerals Society

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