Comparative Study of Separation of Heavy Metals from Leachate Using Activated Carbon and Fuel Ash
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 24, Issue 4
Abstract
Dumpsite leachate contains heavy metals, which eventually get discharged into natural water bodies inflicting heavy damage on the environment and human health. The separation of heavy metals, including Cr, Cu, Pb, Mn, and Zn from leachate is studied using two adsorbents, sludge-based powdered activated carbon (PAC) and pulverized fuel ash (PFA). The adsorption behaviors are analyzed in detail by applying different isotherm models using nonlinear regression methods. The best fit isotherm is determined based on the coefficient of determination (R2) and different optimality criteria. The effect of organic matter on the separation of heavy metals from leachate using PAC and PFA are examined. This study postulated the priority uptake of heavy metals by micropore encapsulation and complex formation by interparticle bridging in PAC and PFA, respectively. Furthermore, this study provides a promising way to utilize the sewage sludge and fuel ash as feasible adsorbents for the separation of heavy metals from dumpsite leachate. In addition, an effective immobilization technique was implemented and evaluated using the diffusivity coefficient (De) and leachability index (LX) for the safe disposal of used adsorbents.
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Acknowledgments
The authors are obliged to the Department of Science and Technology, Government of India and Sophisticated Analytical Instrument Facility for the analytical services rendered for this research.
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Journal of Hazardous, Toxic, and Radioactive Waste
Volume 24 • Issue 4 • October 2020
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© 2020 American Society of Civil Engineers.
History
Received: Nov 21, 2019
Accepted: Jan 28, 2020
Published online: May 29, 2020
Published in print: Oct 1, 2020
Discussion open until: Oct 29, 2020
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