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Hydrological and geochemical factors controlling leachate composition in incinerator ash landfills

By
C. Annette Johnson
C. Annette Johnson
Swiss Federal Institute of Environmental Science and Technology (EAWAG), Dübendorf, Switzerland johnson@eawag.ch
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Karim C. Abbaspour
Karim C. Abbaspour
Swiss Federal Institute of Environmental Science and Technology (EAWAG), Dübendorf, Switzerland johnson@eawag.ch
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Published:
January 01, 2004

Abstract

The hydrological and geochemical processes that control leachate composition are discussed for two examples, the first being a landfill containing municipal solid waste incinerator (MSWI) bottom ash, Landfill Lostorf, and the second a lysimeter containing blocks of cement-stabilized MSWI air pollution control (APC) residues. In both examples the leachate consists of a component that takes months to years to pass through the landfill and rainwater that passes through the landfilled material via preferential flow paths. The composition of the leachate is relatively constant and is only diluted with rainwater during rain events. The concentration of major leachate components (Na+, K+, Cl and OH) is controlled by diffusion processes and by the precipitation of solubility-controlling phases (Ca(II), Al(III), forumla and Si(IV)). The observed concentrations of some relatively insoluble heavy metal and metalloid species may be explained by the precipitation of secondary phases. More soluble species may be adsorbed on surfaces of or incorporated in minerals, but the mechanisms remain to be elucidated.

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Contents

Geological Society, London, Special Publications

Energy, Waste and the Environment: a Geochemical Perspective

R. Gieré
R. Gieré
Universität Freiburg, Germany
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P. Stille
P. Stille
ULP-École et Observatoire des Sciences de la Terre-CNRS, Strasbourg, France
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Geological Society of London
Volume
236
ISBN electronic:
9781862394841
Publication date:
January 01, 2004

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