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MSWI bottom ash used as basement at two pilot-scale roads: comparison of leachate chemistry and reactive transport modeling
Ecole des Mines de Paris.
Ecole des Mines de Paris.
INERIS, Wastes and Contaminated Sites Unit.
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2011 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 31, no 2, p. 267-280Article in journal (Refereed) Published
Abstract [en]

The recycling of municipal solid waste incineration bottom ash as aggregates for road basement requires assessing the long-term evolution of leachate chemistry. The Dåva (Sweden) and Hérouville (France) pilot-scale roads were monitored during 6 and 10 years, respectively. Calculated saturation indices were combined to batch test modeling to set a simplified geochemical model of the bottom ash materials. A common reactive transport model was then applied to both sites. At Hérouville, pH and the concentration of most elements quickly drop during the first two years to reach a set of minimum values over 10 years. The decrease is less pronounced at Dåva. The evolutions of pH and major element concentrations are fairly well related to the following pH-buffering sequence: portlandite, C-S-H phases or pseudo-wollastonite and, finally, calcite in equilibrium with atmospheric CO2. Al(OH)3, barite, ettringite and monohydrocalcite may also control leachate chemistry. Cu release is correctly modeled by DOM complexation and tenorite equilibrium. Temperature has no significant effect on the modeling of leachate chemistry in the range 5-30 °C, except at high pH. Effects at road edges and roadside slopes are important for the release of the less reactive elements and, possibly, for carbonation processes.

Place, publisher, year, edition, pages
2011. Vol. 31, no 2, p. 267-280
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-5414DOI: 10.1016/j.wasman.2010.06.002ISI: 000286411400009Scopus ID: 2-s2.0-78649868970Local ID: 3831cac0-8ac2-11df-8806-000ea68e967bOAI: oai:DiVA.org:ltu-5414DiVA, id: diva2:978288
Note
Validerad; 2011; 20100708 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lidelöw, SofiaLagerkvist, Anders

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