The Landfill Directive is also driving a change in the types of
material permitted to be disposed of to landfill. This is particularly
evident through the diversion of biodegradable waste. In unsorted
MSW, biodegradable waste has been estimated to contribute at
least 20% of the mass and HHW approximately 4% (including
WEEE). Reduced biodegradable matter increases the relative
proportions of HHW (and other waste types) in MSW. Increased
recycling rates for paper, glass etc., contributing >40% to MSW, will
boost the HHW proportion further. Leachate from existing and new
landfills will be expected to be very different to leachate from older/
closed sites due to changes in the composition of landfilled waste.
The consequences for the hazardous component of MSW require
further evaluation, although a decline in organic matter can be
expected to result in leachates containing predominantly inorganic
ions. The impact on the sorption of XOCs and heavy metal attenu-
ation may be beneficial, reducing the mobility of hazardous species.
Changes to leachate treatment techniques will be necessitated and
the long-term management of landfills adjusted.
The Landfill Directive is also driving a change in the types of material permitted to be disposed of to landfill. This is particularly evident through the diversion of biodegradable waste. In unsorted MSW, biodegradable waste has been estimated to contribute at least 20% of the mass and HHW approximately 4% (including WEEE). Reduced biodegradable matter increases the relative proportions of HHW (and other waste types) in MSW. Increased recycling rates for paper, glass etc., contributing >40% to MSW, will boost the HHW proportion further. Leachate from existing and new landfills will be expected to be very different to leachate from older/ closed sites due to changes in the composition of landfilled waste. The consequences for the hazardous component of MSW require further evaluation, although a decline in organic matter can be expected to result in leachates containing predominantly inorganic ions. The impact on the sorption of XOCs and heavy metal attenu-ation may be beneficial, reducing the mobility of hazardous species. Changes to leachate treatment techniques will be necessitated and the long-term management of landfills adjusted.
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