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	Immobilization of Heavy Metals by Solidification/Stabilization of Co-Disposed Flue Gas Desulfurization Brine and Coal Fly Ash
	Renew, Jay E. ; Huang, Ching-Hua ; Burns, Susan E. ; Carrasquillo, Maya ; Sun, Weiling ; Ellison, Kirk M.
	2016
关键词	ARSENIC-CONTAMINATED SOILS RADIOACTIVE LIQUID WASTE CEMENT KILN DUST PORTLAND-CEMENT STABILIZATION/SOLIDIFICATION S/S CHLORIDE BINDING CORROSION RISK FRIEDELS SALT FIXING AGENTS STABILIZATION
英文摘要	The coal-fired power industry in the United States faces growing needs to improve wastewater treatment and disposal practices, especially for wet flue gas desulfurization (FGD) systems.. Zero liquid discharge (ZLD) treatment systems may be implemented, and one ZLD option is the coupling of brine concentration with solidification/stabilization (S/S). This S/S process could be achieved by co-disposing the concentrated FGD brines with coal fly ash (CFA) and Portland cement. S/S using bituminous CFA (BCFA) achieved good retainment (average 68-90%) of As-V, Cd-II, Hg-II, and Se-IV in the toxicity characteristic leaching procedure (TCLP); however, poor retainment was observed for Cr-VI and Se-VI. Separate experiments showed good sorption of As-V, Cd-II, Hg-II, and Se-IV (average 56-100%) but poor sorption of Cr-VI and Se-VI to S/S solids. Meanwhile, Cr-VI and Se-VI retainment could be enhanced by addition of FeSO4 to the S/S mixture, likely due to reduction of these metals to lower oxidation states. Compared to BCFA, S/S using sub-bituminous CFA (SCFA) resulted in higher pH S/S solids and final TCLP leachate, which increased retainment of As-V, Cd-II, and Se-VI. Apart from the pH impact on the process, As-V retainment was likely improved by the high Ca content of SCFA and Se-VI retainment was improved by the incorporation of SeO42- in Friedel's salt (AFm-Cl) by exchange with Cl-. Friedel's salt was positively identified by X-ray diffraction in the SCFA S/S solids but not for the BCFA S/S solids. Even so, reduction of Se-VI plus S/S is likely a better immobilization strategy than SeO42- substitution in the AFm phase because of higher stability under long-term landfill conditions.; Environmental Research and Education Foundation (EREF); Southern Company; Southern Research Institute; Georgia Power Fellowship; SCI(E); CPCI-S(ISTP); 6; 5042-5051; 30
语种	英语
出处	22nd International Symposium on Combustion Processes (ISoCP-2015)
DOI标识	10.1021/acs.energyfuels.6b00321
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/457000]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Renew, Jay E.,Huang, Ching-Hua,Burns, Susan E.,et al. Immobilization of Heavy Metals by Solidification/Stabilization of Co-Disposed Flue Gas Desulfurization Brine and Coal Fly Ash. 2016-01-01.

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