Retention of Multiple Heavy Metal Ions by Fly Ashby A. Sridharan,
N. S. Pandian,
Abstract: Clayey soils are widely used as liner materials in landfills. They, not only retard the transport of leachates due to their low permeability, but also retain the heavy metal ions due to their exchange capacity. In order to improve their retention capacity, fly ash, a waste material arising out of the combustion of coal, which is available abundantly, has been studied as a pre-filter material. Fly ash retains substantial amount of lead and zinc ions on permeation of the respective individual ionic solutions. In general, the existence of single contaminant cation in landfill leachates is rare and it is invariably a mixture of cations. Hence, in the present investigation, an attempt has been made to study the retention characteristics of fly ash on permeation of a mixture of contaminant cations. Experimental results indicate that when both lead and zinc are present in the landfill leachate, initially fly ash retains both the ions and then releases gradually the retained zinc ions to retain more amount of lead ions.
Subject Headings: Fly ash | Landfills | Leachates | Lead (chemical) | Zinc | Clays | Heavy metals | Recycling
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