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ASSESSMENT OF HYDROLOGICAL PARAMETERS IN PRE-TREATED WASTE BY TIME DOMAIN REFLECTOMETRY

The water in contact with waste materials is one of the most important determinants for longterm emissions from landfilled wastes (Kjeldsen et al., 2002). It plays a major role for the chemical and biological reactions in landfilled wastes (Mora-Naranjo et al., 2004, He et al., 2006), and in biological reactions in pre-treatment processes (Christensen, 2001). In humid and semi-arid areas, the water content determines the efficacy of final caps (Börjesson et al., 1998; Yanful et al., 2003). The water level inside a landfill has been suggested to influence heavy metal emissions via the leachate (Karlsson et al., 2005). The EU directive 1999/31/EC gives requirements for the reduction and control of leachate production.

The amount of water in contact with solid wastes is crucial for their liquid emission. In this study, time domain reflectometry, an electromagnetic method to determine water content and electrical conductivity in porous media, is applied to different soil-like, pretreated wastes. In laboratory calibration experiments, the dielectric properties of the waste materials appear to be different from those from Swedish top- and subsoils. Especially around mid-range water content, the contribution of the solid material to the dielectric response is larger than from soils. The initial time domain reflectometry measurements from a 20m3 pre-treated waste lysimeter are presented. The method proves to be promising for future modelling of water and solute transport in pre-treated wastes.

Copyright:	© IWWG International Waste Working Group
Quelle:	Specialized Session E (Oktober 2007)
Seiten:	14
Preis inkl. MwSt.:	€ 0,00
Autor:	Dr.-Ing. Martijn van Praagh K. M. Persson Magnus Persson
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