Geochemical Modeling of Leaching from MSWI Air-Pollution-Control Residues

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• 作者：Thomas Astrup ; Joris J. Dijkstra ; Rob N. J. Comans ; Hans A. van der Sloot ; and Thomas H. Christensen
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：June 1, 2006
• 年：2006
• 卷：40
• 期：11
• 页码：3551 - 3557
• 全文大小：170K
• 年卷期：v.40,no.11(June 1, 2006)
• ISSN：1520-5851

文摘

This paper provides an improved understanding of theleaching behavior of waste incineration air-pollution-control(APC) residues in a long-term perspective. Leaching wasinvestigated by a series of batch experiments reflectingleaching conditions after initial washout of highly solublesalts from residues. Leaching experiments were performedat a range of pH-values using carbonated and noncarbonatedversions of two APC residues. The leaching data wereevaluated by geochemical speciation modeling and discussedwith respect to possible solubility control. The leachingof major elements as well as trace elements was generallyfound to be strongly dependent on pH. As leachingcharacterization was performed in the absence of highsalt levels, the presented results represent long-term leachingafter initial washout from a disposal site, that is, liquid-to-solid ratios above 1-2 L/kg. The leaching of Al, Ba, Ca,Cr, Pb, S, Si, V, and Zn was found influenced by solubilitycontrol from Al₂O₃, Al(OH)₃, Ba(S,Cr)O₄ solid solutions,BaSO₄, Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O, CaAl₂Si₄O₁₂·2H₂O, Ca(OH)₂, CaSiO₃, CaSO₄·2H₂O, CaZn₂(OH)₆·2H₂O, KAlSi₂O₆, PbCO₃,PbCrO₄, Pb₂O₃, Pb₂V₂O₇, Pb₃(VO₄)₂, ZnO, Zn₂SiO₄, andZnSiO₃. The presented dataset and modeling results forma thorough contribution to the assessment of long-termleaching behavior of APC residues under a wide range ofconditions.