Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 98, Issue -, Pages 128-134Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2013.09.012
Keywords
Textile dyeing sludge; Heavy metals; Sequential fraction; Principal component analysis
Categories
Funding
- Key Project of Technology Innovation of Department of Education of Guangdong Province [20120CZD0021]
- Project of Enterprise Special Plan of Guangdong Province
- Ministry of Education and Science and Technology [2011B090400161]
- foundation for distinguished young talents in higher education of Guangdong, China [LYM11059]
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The safe disposal of sludge from textile dyeing industry requires research on bioavailability and concentration of heavy metals. In this study, concentrations and chemical speciation of heavy metals (Cd, Cr, Cu, Ni, Zn, Pb) in sludge from nine different textile dyeing plants were examined. Some physiochemical features of sludge from textile dyeing industry were determined, and a sequential extraction procedure recommended by the Community Bureau of Reference (BCR) was used to study the metal speciation. Cluster analysis (CA) and principal component analysis (PCA) were applied to provide additional information regarding differences in sludge composition. The results showed that Zn and Cu contents were the highest, followed by Ni, Cr, Cd and Pb. The concentration of Cd and Ni in some sludge samples exceeded the standard suggested for acidic soils in China (GB18918-2002). In sludge from textile dyeing plants, Pb, Cd and Cr were principally distributed in the oxidizable and residual fraction, Cu in the oxidizable fraction, Ni in all four fractions and Zn in the acid soluble/exchangeable and reducible fractions. The pH and heat-drying method affected the fractionation of heavy metals in sludge. (C) 2013 Elsevier Inc. All rights reserved.
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