Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 244, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2012.11.036
Keywords
Bioconcentration factors; Heavy metals; Passivators; Sewage sludge; Vermistabilization
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Funding
- National Water Pollution Project for Taihu Lake Pollution Control of China [2012ZX07101-007]
- Basic Research Project for State Level Public-benefit Research Institutes
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The present study revealed the effects of fly ash (FA) and phosphoric rock (PR) on stabilization of sewage sludge (SS) after vermicomposting for 60 days. The earthworms in all vermibeds showed significant increases in tissue metal; however, the bioconcentration factors (BCFs) of all investigated metals (except Zn) differed among treatments. Additionally, significant differences were observed in the final system weight and SS + Passivant weight reduction among treatments, but not in the percentage reduction of total system weight and organic matter (OM). pH decreased from the initial levels, eventually reaching neutrality. Significantly greater earthworm heavy metals content, growth and reproduction rates and BCFs were observed, while a decreased percentage of total heavy metals concentration and a proportional decrease of extractable metals (except Cu and Zn) were observed in treatments mixed with FA and PR. Furthermore, significant linear correlations between BCFs and a reduction in percentage concentration of total metals (Cu, Pb, Cd and As) were shown, as well as BCF-Cu and relative proportional changes in extractable Cu. These results indicate that vermicomposting with proportions of FA and PR is better for stabilization and remediation of SS in a short period of time. (C) 2012 Elsevier B.V. All rights reserved.
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