Leaching Behavior of Coal Combustion Products and the Environmental Implication in Road Construction

2009PDFTech ReportNUTC R201DTRT06-G-0014Road constructionFly ashLeachingContaminantsEnvironmental impactsSeleniumResearch HubLeachingEnvironmental impactsCombustionMissouriUnited StatesMissouri University of Science and Technology. Center for Transportation Infrastructure and SafetyWang, JianminMissouri University of Science and Technology. Center for Transportation Infrastructure and SafetyUnited States. Dept. of Transportation. Research and Innovative Technology AdministrationUS Transportation CollectionThis is the third annual report for Project #043352. Project #043352 is designed to establish the leaching characteristics for several different types of ash using a relatively rigorous leaching procedure developed by Kosson et al (2002) for a wide range of constituents. That data will ultimately become part of a broader database of leaching characteristics that will be used to identify families of curves for a range of constituents and ash types, for prediction of leaching potential. In addition to the previous work at Missouri S&T (Former UMR) on the leaching of arsenic and selenium from a few selected fly ash samples, more detailed work on arsenic and selenium, including their dominant aqueous species, will be performed in this project. This will include development of data on intrinsic leaching parameters, such as total leachable mass and adsorption constants. The metal leaching behavior information for various coal fly ashes will help the construction industry in determining the types of fly ash that yield the minimum environmental impact for road construction. It will also help the energy industry in determining the potential environmental impact of the fly ash during disposal and other beneficial use applications