title: Impact of leaching conditions on constituents release from Flue Gas Desulfurization Gypsum (FGDG) and FGDG-soil mixture.
abstract: The interest in using Flue Gas Desulfurization Gypsum (FGDG) for land applications has increased recently. This study evaluates the leaching characteristics of trace elements in "modern" FGDG (produced after fly ash removal) and FGDG-mixed soil (SF) under different environmental conditions using recently approved EPA leaching methods (1313-1316). These methods employ various pH and liquid-solid (LS) ratios under batch leaching, column percolation and diffusion controlled release scenarios. Toxicity Characteristic Leaching Protocol (TCLP) and Synthetic Precipitation Leaching Protocol (SPLP) were used for comparison. The data obtained from new EPA methods provide broad insight into constituent release from FGDG and SF when compared to TCLP and SPLP. The release of toxic elements such as Hg, As, Pb, Co, Cd and Cr from SF was negligible. High release of B from FGDG was observed under all tested conditions; however, its release from SF was low. Both FGDG and SF released Se under all pH conditions (2-13) and LS ratios (1-10) in low concentrations (0.02-0.2mg/L). The data from this study could be used to investigate potential use of "modern" FGDG for new beneficial land applications.
authors.affiliation: Pegasus Technical Services Inc., 46 E. Hollister St., Cincinnati, OH 45219, United States; Department of Biomedical, Chemical and Environmental Engineering (DBCEE), 705 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012, United States.
authors.forename: N H
authors.initials: NH
authors.lastname: Koralegedara
authors.affiliation: U.S Environmental Protection Agency, National Risk Management Research Laboratory, 26 W. Martin Luther King Dr., Cincinnati, OH 45268, United States. Electronic address: al-abed.souhail@epa.gov.
authors.forename: S R
authors.initials: SR
authors.lastname: Al-Abed
authors.affiliation: Pegasus Technical Services Inc., 46 E. Hollister St., Cincinnati, OH 45219, United States.
authors.forename: M K J
authors.initials: MK
authors.lastname: Arambewela
authors.affiliation: Department of Biomedical, Chemical and Environmental Engineering (DBCEE), 705 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012, United States.
authors.forename: D D
authors.initials: DD
authors.lastname: Dionysiou
keywords: Boron; EPA leaching methods; Element leaching; Flue Gas Desulfurization Gypsum (FGDG) and FGDG-soil mixture; Selenium
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