Landfill: Difference between revisions

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The engineered cap can be constructed in several ways and the design selected is evaluated in the same way as the landfill lining system, taking account of the various engineering constraints and impacts to be avoided at each site. The design also undergoes similar risk assessment to the lining system.

The final layer of waste is usually covered with a thick layer of cover, known as the final cover (see diagram above).

Commonly, the capping layer will consist of a compacted clay layer of 1 metre thickness. This can be replaced or supplemented by flexible membranes such as LLDPE (Linear Low Density Polyethylene) or GCL (Geo-synthetic Clay) in varying combinations. Membranes can be laid in an over-lapped but unjoined fashion or can be overlapped and welded similar to lining systems.

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 The engineered cap can be constructed in several ways and the design selected is evaluated in the same way as the landfill lining system, taking account of the various engineering constraints and impacts to be avoided at each site. The design also undergoes similar risk assessment to the lining system.
+The final layer of waste is usually covered with a thick layer of cover, known as the final cover (see diagram above).
 Commonly, the capping layer will consist of a compacted clay layer of 1 metre thickness. This can be replaced or supplemented by flexible membranes such as LLDPE (Linear Low Density Polyethylene) or GCL (Geo-synthetic Clay) in varying combinations. Membranes can be laid in an over-lapped but unjoined fashion or can be overlapped and welded similar to lining systems.