Abstract
The main aim of the present work has been to understand the retention behavior of metal ions of copper and iron by mixtures of sand bentonite and sand fly ash in the context of their use as liners for waste disposal facilities. Fine sand containing high silica, bentonite, fly ash mixtures have been used to study the sorption behavior. Batch adsorption studies were carried out to estimate the adsorption capacities of two different soil mixtures namely Sand- Bentonite (SB) and Sand Fly ash (SF). It was found that at different Soil to Liquid ratios (S/L) sand bentonite mixture with 20% bentonite sorbs the higher amount of copper whereas sand fly ash mixture with 10% fly ash sorbs the higher amount of iron. Similarly at different initial concentration 20% sand bentonite mixture sorbs the higher amount of copper whereas 10% sand bentonite mixture sorbs the higher amount of iron. Sorption/adsorption isotherms were also established for the experimental data, which indicate that adsorption of heavy metal ions on to SB and SF were favorable.
Highlights
Heavy metals are discharged from mining and various other industries such as electroplating, metal finishing, textile, storage batteries, etc
2012, Vol 1, No 2 for removal of heavy metals from landfill leachate. (Tahir & Naseem, 2004) The objective of the present study is to investigate adsorption characteristics for removal of heavy metal ions such as copper and iron from an aqueous solution by the use of sand fly ash and sand bentonite mixtures
It can be seen that soprption of Cu on any sand bentonite mixture (SB) and sand fly ash mixture (SF) mixtures by soil is almost same for any soil to liquid ratio up to 80
Summary
Heavy metals are discharged from mining and various other industries such as electroplating, metal finishing, textile, storage batteries, etc. Some of the heavy metals are toxic even at very low concentration and pose serious environmental problems and are dangerous to human health and ecosystem. Many cities in developing countries like India are facing serious problems of disposing solid, liquid and hazardous waste generated by various industries. Solid waste landfills used for disposal of industrial wastes constitute a potential threat to the ground water. Soil liners have been widely used to control and contain toxic and hazardous materials and minimize soil and ground water contamination. Copper etc, may be bound or sorbed by natural substances present in soils which may increase or decrease their mobility (Dube, Zbytniewski, Kowalkowski, Cukrowska & Buszewski, 2001). Soil liners are preferred because of their low cost, large leachate attenuation capacity and resistance to damage and puncture (Mohammed & Naik, 2011)
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