The main aim of this study has been to assess different soils/amended soils for their suitability as liner materials for waste containment facilities. The assessment is based on their sorption and leachability studies. Sorption studies have been done to understand the mode of retention of a heavy metal like copper on soils. The experimental data was fitted on isotherm and kinetic models. Langmuir and Freundlich isotherm proved Langmuir as a better model than Freundlich, Langmuir monolayer adsorption capacity matched well with the experimental values. Kinetic models like pseudo first order, second order, Elovich and intraparticle diffusion models proved that along with surface adsorption chemi-sorption, desorption, ion exchange, precipitation and intraparticle diffusion are taking place, however, it was not possible to classify which was the dominant among all. In general it can be said that red soil along with its additives can retain copper effectively and in particular red soil with 3% cement gave maximum sorption. pH played a very important role in the sorption process, maximum sorption was at pH range from 4 to 7. Since for most of the landfills the average pH range of its leachate varies from 3.8 to 8.8, these materials have good potential as a landfill liner material.
Syed Abu Sayeed Mohammed and Maya Naik, 2011. Utilization of Red Soils and Amended Soils as a Liner Material for Attenuation of Copper from Aqueous Solution: Isotherm and Kinetic Studies. Journal of Environmental Science and Technology, 4: 504-519.