Impact of leaching conditions on constituents release from Flue Gas Desulfurization Gypsum (FGDG) and FGDG-soil mixture

JOURNAL OF HAZARDOUS MATERIALS

卷:324

Article; Proceedings Paper

Koralegedara, N. H.^1,3  Al-Abed, S. R.²  Arambewela, M. K. J.¹  Dionysiou, D. D.³ 

[1] Pegasus Tech Serv Inc, 46 E Hollister St, Cincinnati, OH 45219 USA

[2] US EPA, Natl Risk Management Res Lab, 26 W Martin Luther King Dr, Cincinnati, OH 45268 USA

[3] Univ Cincinnati, Engn Res Ctr 705, DBCEE, Cincinnati, OH 45221 USA

关键词: Flue Gas Desulfurization Gypsum (FGDG) and FGDG-soil mixture;    Element leaching;    EPA leaching methods;    Selenium;    Boron;   

DOI  :  10.1016/j.jhazmat.2016.01.019

来源: Elsevier

【 摘 要 】

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 (0.02-0.2 mg/L). The data from this study could be used to investigate potential use of modern FGDG for new beneficial land applications. Published by Elsevier B.V.

【 授权许可】

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