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Sequestration of metals in carbonated municipal solid waste incineration (MSWI) fly ash
2003 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 23, no 7, p. 631-640Article in journal (Refereed) Published
Abstract [en]

Waste management is in need of a reliable and economical treatment method for metals in fly ashes from municipal solid waste incineration (MSWI). However, no state-of-the-art technique has gained wide acceptance yet. This paper is a synthesis of five elsewhere published investigations covering a project which aimed to assess the possibilities and limitations of adding carbon dioxide (CO2) to fly ash as a stabilization method. Carbonation factors that were studied are the partial pressure of carbon dioxide (CO2), the addition of water, the temperature, and the reaction time. Laboratory experiments were performed applying methods such as factorial experimental design, thermal analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD), and leaching assays including pHstat titration and sequential extraction. Leaching data were verified and complemented using chemical equilibrium calculations. Data evaluation was performed by means of multivariate statistics such as multiple linear regression, principal component analysis (PCA), and partial least squares (PLS) modeling. It was found that carbonation is a good prospect for a stabilization technique especially with respect to the major pollutants lead (Pb) and zinc (Zn). Their mobility decreased with increasing factor levels. Dominating factors were the partial pressure of CO2 and the reaction time, while temperature and the addition of water were of minor influence. However, the treatment caused a mobilization of cadmium (Cd), requiring further research on possible countermeasures such as metal demobilization through enhanced silicate formation.

Place, publisher, year, edition, pages
2003. Vol. 23, no 7, p. 631-640
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-4634DOI: 10.1016/S0956-053X(03)00095-3ISI: 000185292500009Scopus ID: 2-s2.0-0042384886Local ID: 29c57980-6f61-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-4634DiVA, id: diva2:977508
Note
Validerad; 2003; 20060926 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ecke, Holger

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