Reduction of Pb, Zn and Cd Availability from Tailings and Contaminated Soils by the Application of Lignite Fly Ash

被引:0
作者
Christina Stouraiti
Anthimos Xenidis
Ioannis Paspaliaris
机构
[1] National Technical University of Athens,Laboratory of Metallurgy
来源
Water, Air, and Soil Pollution | 2002年 / 137卷
关键词
cadmium; EDTA; lead; lignite fly ash; stabilization; TCLP; toxicity; zinc;
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摘要
The effectiveness of lignite fly ash for stabilization of Pb,Zn and Cd in tailings and contaminated soils was examined. Flyash was mixed with the contaminated soil or oxidic tailingssamples at various doses and pot experiments were performed.The effectiveness of stabilization was mainly evaluated by thestandard US EPA TCLP toxicity test. The 5-stage sequentialextraction procedure was also applied to determine the form ofcontaminants in the fly ash amended soil or tailings samples.Complementary EDTA extraction tests were also carried out. Thefly ash treatment resulted in the reduction of TCLP solubilityof Pb, Zn and Cd to below the respective regulatory limits at5 and 10% w/w fly ash addition rates in tailings and soil,respectively. Speciation of lead, in the treated soil andtailings samples indicated that there was a significanttransition of the heavy metals form from the exchangeable andcarbonate fractions to reducible and residual, suggesting thatthe potential mechanisms of heavy metals retention are, apartfrom increase of pH, sorption on the oxides and hydroxidessurfaces and binding with the hydrated fly ash compounds.
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页码:247 / 265
页数:18
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