Evaluation of leaching characteristics and environmental compatibility of solidified/stabilized industrial waste |
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Authors: | Rachana Malviya Rubina Chaudhary |
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Institution: | (1) Council of Scientific and Industrial Research, School of Energy and Environmental Studies, Devi Ahilya University, Indore, India;(2) School of Energy and Environmental Studies, Devi Ahilya University, Takshila Campus, Khandwa Road, Indore-17, M.P., India |
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Abstract: | An attempt was made to judge the environmental compatibility, the governing leaching mechanism, and mobility patterns in a
waste–cement solidified/stabilized matrix after 21 days of curing. The mixed sludge from a steel pickling facility was stabilized
by ordinary Portland cement. Iron was the major leachable metal, along with Pb, Zn, and Mn. To characterize the leaching behavior,
the mobility and mechanism of leaching were determined by diffusion leaching tests. In the solidified/stabilized matrix, the
mobility of all the elements studied was reduced, and average to low mobility was observed. Values for the negative log of
the effective diffusion coefficient of more than 12.5 were obtained for the metals. The dominant leaching mechanisms were
surface wash off in the initial stage, followed by diffusion. The environmental performance of the solidified/stabilized product
when considered in terms of mass leached over 64 days was found to be satisfactory for consideration for the safe disposal
and reuse of waste. |
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Keywords: | Solidification/stabilization Ordinary Portland cement Leaching Diffusion Diffusion coefficient |
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