Civil and Environmental Engineering
 
 
Leaching Processes and Contaminant Release from Solid Wastes and Secondary Materials

Understanding the leaching mechanisms by which constituents in a solid material are released to the environment through contact with water is essential for making waste management decisions and for assessing the potential impacts to human health and ecological systems.

Our efforts in this area include the development of laboratory test methods and source term models for improved understanding of the controlling mechanisms, the evaluation of material leaching characteristics, and the prediction of long-term environmental performance of waste and secondary materials during utilization in construction applications or disposal scenarios.

 

Current major project funded by the US EPA aims to evaluate the potential leaching of mercury and other constituents from coal combustion residues produced by power plants that use enhanced mercury emission reduction technology.

Selected References

“Characterization of coal combustion residues from electric utilities – Leaching and characterization data,” D.S. Kosson, F. Sanchez, P. Kariher, L.H. Turner, R. Delapp, and P. Seignette. Prepared for the US Environmental Protection Agency – Air Pollution Prevention and Control Division, EPA/600/R-09/151, December 2009. (pdf file)

"Characterization of Coal Combustion Residues from Electric Utilities Using Wet Scrubbers for Multi-Pollutant Control," F. Sanchez, D.S. Kosson, R. Keeney, R. Delapp, L. Turner, and P. Kariher. Prepared for the US Environmental Protection Agency – Air Pollution Prevention and Control Division, EPA/600/R-08/077, July 2008, available at: http://www.epa.gov/nrmrl/pubs/600r08077/600r08077.htm

"Characterization of Mercury-Enriched Coal Combustion Residues from Electric Utilities Using Enhanced Sorbents for Mercury Control," F. Sanchez, R. Keeney, D. S. Kosson, and R. Delapp. Prepared for the US Environmental Protection Agency – Air Pollution Prevention and Control Division, Contract No. EP-C-04-023, Work Assignment 1-31, Report EPA-600/R-06/008, Feb. 2006, available at: http://www.epa.gov/nrmrl/pubs/600r06008/600r06008.html

"Probabilistic approach for estimating the release of contaminants under field management scenarios," F. Sanchez, and D. S. Kosson, Waste Management, 25, 463-472, 2005. View Abstract.

"Multi-regime transport model for leaching of heterogeneous porous materials," F. Sanchez, I. W. Massry, T. T. Eighmy, and D. S. Kosson, Waste Management, 23(3), 219-224, 2003. View Abstract.

"Effects of intermittent wetting on concentration profiles and release from a cement-based waste matrix," F. Sanchez, A. C. Garrabrants, and D. S. Kosson, Environmental Engineering Science, 20(2), 135-153, 2003. View Abstract

"An integrated framework for evaluating leaching in waste management and utilization of secondary materials," D. S. Kosson, H. A. van der Sloot, F. Sanchez, and A. C. Garrabrants, Environmental Engineering Science, 19(3), 159-204, 2002. View Abstract.