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MODELING OF TRANSPORT AND GEOCHEMICAL PROCESSES BETWEEN LANDFILL LEACHATE AND A SATURATED BARRIER SYSTEM

Landfill leachate is a dangerous and polluting solution formed by a very complex sequence of physical, chemical and biological processes modifying the rainwater that percolates through waste (Bogner et al.,1996). Migration of the pollutants from the waste material into the percolating water is another important phenomenon requiring attention (Mora-Naranjo et al., 2004). The resulting leachate is a solution containing dissolved organic matter, inorganic macrocomponents, heavy metals and xenobiotic organic compounds and is characterized by reducing redox state (Christensen et al., 2001). Migration is a long-term and continuous process and the leachate may evolve and pollute the surrounding environment for hundred of years (Ustohalova et al., 2006).

Landfill leachate is often a dangerous solution with a very complex matrix, produced from biodegradation processes that can last for hundreds of years; during this period changes may take place in the composition and chemical, physical and structural characteristics of the containment system. The aim of this study is to investigate the main interactions taking place in the leachate-clayey barrier system and whether these interactions are capable of modifying solid phase porosity and creating an unconfined leachate plume, since, after mixing with pore water of the surrounding barrier, this leachate plume could pollute soil and groundwater. Numerical models of contaminant transport through porous media are now commonly used to make quantitative predictions of pollutant migration. The chemical and physical processes involved, and the alteration related to the migration of leachate into the clayey barrier of Buriano Landfill (Montecatini Val di Cecina, Tuscany) have been investigated using a one-dimensional model that simulates reactive diffusion. The numerical simulator used in this study is TOUGHREACT.

Copyright:	© IWWG International Waste Working Group
Quelle:	Specialized Session E (Oktober 2007)
Seiten:	12
Preis inkl. MwSt.:	€ 12,00
Autor:	C. Geloni M. Guidi B. Raco M. Cervelli
Artikel weiterleiten	In den Warenkorb legen	Artikel kommentieren

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