Chemical stability of geopolymers containing municipal solid waste incinerator fly ash

被引：126

作者：

Lancellotti, Isabella ^{[1
]}

Kamseu, Elie ^{[1
]}

Michelazzi, Marco ^{[1
]}

Barbieri, Luisa ^{[1
]}

Corradi, Anna ^{[1
]}

Leonelli, Cristina ^{[1
]}

机构：

[1] Univ Modena & Reggio Emilia, Dipartimento Ingn Mat & Ambiente, I-41100 Modena, Italy

来源：

WASTE MANAGEMENT | 2010年 / 30卷 / 04期

关键词：

HEAVY-METALS; MICROSTRUCTURE; IMMOBILIZATION;

D O I：

10.1016/j.wasman.2009.09.032

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Municipal solid waste incinerators every year produce tons of fly ashes which, differently from coal fly ashes, contain large amounts of toxic substances (heavy metals, dioxins, furans). The stabilization/solidification (S/S) technology known as geopolymerization is proposed with the purpose to bond physically and chemically incinerator fly ashes (IFA) in a solid matrix, in order to reduce pollutant mobility. The chemical stability of geopolymers with Si/Al ratio of 1.8-1.9 and Na/Al ratio of 1.0, synthesized by alkali activation of metakaolin and the addition of 20 wt% of two different kinds of IFA, is presented. The concentration of the alkaline solution, water to solid ratio and curing process have been optimized. The room temperature consolidation of IFA containing geopolymers has been tested for leachability in water for 1 day, accordingly to EN 12457 regulation and extended to 7 days to increase the water attack on solid granules. Leachable metals in the test solution, determined by ICP_AES, fall within limit values set by regulation for non-dangerous waste landfill disposal. Geopolymeric matrix evolution with leaching time has been also evaluated in terms of pH and electrical conductivity increase in solution. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：673 / 679

页数：7

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