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Removal of heavy metals from waste waters by natural and Na-exchanged bentonites

E. Alvarez-Ayuso and A. Garcia-Sanchez
Removal of heavy metals from waste waters by natural and Na-exchanged bentonites
Clays and Clay Minerals (October 2003) 51 (5): 475-480

Abstract

Batch sorption studies of Cr(III), Ni(II), Zn(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.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 51
Serial Issue: 5
Title: Removal of heavy metals from waste waters by natural and Na-exchanged bentonites
Affiliation: CSIC, Department of Environmental Geochemistry, Salamanca, Spain
Pages: 475-480
Published: 200310
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 39
Accession Number: 2004-003216
Categories: Environmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200401
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