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Reactive transport modelling of leachate evolution of MSWI bottom ash used as road basement, Hérouville (France) and Dåva (Sweden) sites

Abstract : The recycling of municipal solid waste of incineration (MSWI) bottom ash as aggregates for road basement requires a better characterization of the evolution of leachate chemistry over a timescale of many decades. In this paper, a common reactive transport model is applied to the Hérouville (France) and Dåva (Sweden) pilot roads whose leachate emissions have been sampled during 10 and 6 years, respectively. The model considers simultaneously the hydrodynamic processes (rain water infiltration, advective and diffusive transport), pH-buffering and solubility-controlled processes by secondary minerals, ageing by atmospheric carbonation, and the leachate chemistry (major elements and trace metals such as Al, Cu, Pb). The evolution of pH is fairly well simulated with the following pH-buffering sequence: portlandite, calcium silicate hydrate (CSH), ettringite and, finally, calcite. The quantity of CO2 dissolved in the percolating rain water is generally not sufficient to explain the pH evolution and carbonation processes, requiring atmospheric gaseous inputs. The relation between pH evolution and element release is discussed for both sites. Calculated Pb release is overestimated when based on solubility-controlled mechanisms only. Edge effects are shown to be important at both sites with an emphasis of carbonation and release of non reactive elements. Temperature has no significant effect on the calculated leachate chemistry in the range of 5 – 30° C, except at high pH.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00568731
Contributeur : Pascale Nalon <>
Soumis le : mercredi 23 février 2011 - 14:08:05
Dernière modification le : jeudi 24 septembre 2020 - 16:34:09

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  • HAL Id : hal-00568731, version 1

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Laurent de Windt, David Dabo, Sofia Lidelöw, Rabia Badreddine, Anders Lagerkvist. Reactive transport modelling of leachate evolution of MSWI bottom ash used as road basement, Hérouville (France) and Dåva (Sweden) sites. Sustainable Management of Waste and Recycled Materials in Construction, 2009, Lyon, France. 8p. ⟨hal-00568731⟩

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