Replacement of 5% of OPC by fly ash and APC residues from MSWI with electrodialytic pre-treatment

Cátia Magro, Gunvor Marie Kirkelund, Paula Guedes, Pernille Erland Jensen, Lisbeth M. Ottosen, Alexandra Ribeiro

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Abstract

Fly ash (FA) and air pollution control (APC) residues are waste products from Municipal Solid Waste Incineration (MSWI). They are classified as hazardous waste due to the content of leachable heavy metals (HM), salts and/or dioxins.
An electrodialytic (ED) process was applied to FA and APC residues as pre-treatment prior to incorporation in mortar, aiming to stabilize and remove HM and chlorides. Eight ED experiments were performed for 7 days with a L/S ratio of 3.5. The number of compartments (2 or 3) and current density (0.1 or 1.0 mA cm-2) varied. After ED treatment the heavy metals left in the ash were not leached to the same extent as in the original ash.
In mortar 5% of Ordinary Portland Cement was replaced by FA and APC residues (raw and ED upgraded). The studied parameters: compressive strength, HM leachability, and Cl content.
The ED pre-treatment resulted in a decrease in both leaching of HM and the Cl content. The compressive tests presented comparable values to the reference mortars. This study suggests that the characteristics of FA and APC residues from MSWI after pre-treatment allows them to be reused in building materials, giving a new edge to waste management.
Original languageEnglish
Title of host publicationInternational RILEM Conference on Materials, Systems and Structures in Civil Engineering : Conference segment on Electrochemistry in Civil Engineering
PublisherRilem publications
Publication date2016
Pages161-161
ISBN (Print)978-2-35158-176-6
ISBN (Electronic)978-2-35158-177-3
Publication statusPublished - 2016
EventInternational RILEM Conference on Materials, Systems and Structures in Civil Engineering - Technical University of Denmark, Kgs. Lyngby, Denmark
Duration: 15 Aug 201629 Aug 2016

Conference

ConferenceInternational RILEM Conference on Materials, Systems and Structures in Civil Engineering
LocationTechnical University of Denmark
CountryDenmark
CityKgs. Lyngby
Period15/08/201629/08/2016

Cite this

Magro, C., Kirkelund, G. M., Guedes, P., Jensen, P. E., Ottosen, L. M., & Ribeiro, A. (2016). Replacement of 5% of OPC by fly ash and APC residues from MSWI with electrodialytic pre-treatment. In International RILEM Conference on Materials, Systems and Structures in Civil Engineering: Conference segment on Electrochemistry in Civil Engineering (pp. 161-161). Rilem publications.