Journal
WASTE MANAGEMENT
Volume 28, Issue 12, Pages 2653-2666Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2008.01.008
Keywords
-
Categories
Funding
- Spanish Ministry of the Environment [2.5-206/2005/2]
- Diputacion Foral de Bizkaia (EKINBERRI). INASMET, ACERALIA
- Iurreta Corporation S.A.
Ask authors/readers for more resources
Mixtures of wastes were prepared to improve on the characteristics of the individual ingredients as Technosols, with special attention given to heavy metal extractability. An anaerobic digested sewage sludge and a CaO-treated aerobic sludge were used. A mixture of the two sludges (50:50 DW basis) was also prepared to provide a third type of sludge. The residues were mixed with other types of waste, such as fly ash, Linz-Donowitz slag, foundry sand, shot blasting machine scrap, fettling and barley straw. Extractability of Cu, Cr, Ni, and Zn by 0.01 M CaCl2 extraction (Me-CaCl2) was carried out, and leachability of these elements was estimated by acidification of an aqueous Suspension of the mixtures with 0.5 N acetic acid (Me-acetic). The total concentrations of the metals were also determined (Me-T). The Me-CaCl2/Me-T ratios for Cu and Ni (means: 4.0% and 3.1%) were higher than those for Cr and Zn (means: 0.07% each). The mean Me-acetic/Me-T ratios followed the order Ni, Zn, Cu, and Cr (19.5K, 4.1%, 3.7%, and 0.09%, respectively). The results highlight the existence of complex interactions among organic matter solubility, pH and heavy metal extractability. (c) 2008 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available