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Chloride leaching from air pollution control residues solidified using ground granulated blast furnace slag

Lampris, C; Stegemann, JA; Cheeseman, CR; (2008) Chloride leaching from air pollution control residues solidified using ground granulated blast furnace slag. CHEMOSPHERE , 73 (9) 1544 - 1549. 10.1016/j.chemosphere.2008.08.003.

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Abstract

Ground granulated blast furnace slag (ggbs) has been used to solidify air pollution control (APC) residues obtained from a major UK energy-from-waste plant. Samples were prepared with ggbs additions between 10 and 50 wt% of total dry mass and water/solids ratios between 0.35 and 0.80. Consistence, setting time, compressive strength and leaching characteristics have been investigated. Results indicated that the highly alkaline nature of APC residues due to the presence of free lime can be used to activate ggbs hydration reactions. Increasing ggbs additions and reducing the water content resulted in increased compressive strengths, with 50 wt% ggbs samples having average 28 d strengths of 20.6 MPa. Leaching tests indicate low physical encapsulation and minimal chemical fixation of chloride in ggbs solidified APC residues. The results suggest that more than 50 wt% ggbs additions would be required to treat APC residues to meet the current waste acceptance criteria limits for chloride. (C) 2008 Elsevier Ltd. All rights reserved.

Type:Article
Title:Chloride leaching from air pollution control residues solidified using ground granulated blast furnace slag
DOI:10.1016/j.chemosphere.2008.08.003
Keywords:Hazardous waste, Incineration, Solidification, Soluble salts, Leaching, Air pollution control residues, WASTES, CEMENT, STABILIZATION/SOLIDIFICATION
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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