Effects of cement on redistribution of trace metals and dissolution of organics in sewage sludge and its inorganic waste-amended products

Effects of cement on redistribution of trace metals and dissolution of organics in sewage sludge and its inorganic waste-amended products

The suitability of using cement-stabilized sludge products as artificial soils in earth works was evaluated. The sludge products investigated were cemented sludge, cement-treated clay-amended sludge (SS + MC), and cement-treated copper slag-amended sludge (SS + CS). The leachability of lead (Pb), zi...

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Bibliographic Details
Published in:Waste management (Elmsford) Vol. 26; no. 11; pp. 1294 - 1304
Main Authors: Lim, T.T., Chu, J., Goi, M.H.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 2006
New York, NY Elsevier Science
Subjects:
Applied sciences
Exact sciences and technology
Metals, Heavy - chemistry
Other industrial wastes. Sewage sludge
Other wastes and particular components of wastes
Pollution
Refuse Disposal - methods
Sewage - chemistry
Soil Pollutants - analysis
Solubility
Trace Elements - chemistry
Wastes
Dissolved organic carbon
Trace element
Amendment
Correlation analysis
Lead
Slag
Sequential extraction
Lixiviation
Sewage sludge
Dissolution
Heavy metal
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Summary:The suitability of using cement-stabilized sludge products as artificial soils in earth works was evaluated. The sludge products investigated were cemented sludge, cement-treated clay-amended sludge (SS + MC), and cement-treated copper slag-amended sludge (SS + CS). The leachability of lead (Pb), zinc (Zn), copper (Cu), and chromium (Cr) were assessed using the sequential extraction technique, toxicity characteristic leaching procedure (TCLP), NEN 7341 availability test, and column leaching test. The results indicated that Zn leachability was reduced in all the cement-stabilized sludge products. In contrast, Cu was transferred from the organic fraction to the readily leachable phases in the cement-stabilized sludge products and therefore exhibited increased leachability. The increased Cu leachability could be attributed to dissolution of humic substances in the sludge as a result of elevated pH. Good correlation between dissolved organic carbon (DOC) and heavy metal leaching from the cement-stabilized sludge products was observed in the column leaching experiment. Even with a cement percentage as small as 12.5%, calcium silicate hydrate (C–S–H) was formed in the SS + MC and SS + CS products. Inclusion of the marine clay in the SS + MC products could reduce the leaching potentials of Zn, and this was the great advantage of the marine clay over the copper slag for sludge amendment.
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ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2005.11.001