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Landfill: Difference between revisions
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*To provide an effective growing medium and afteruse for the site | *To provide an effective growing medium and afteruse for the site | ||
Commonly, the capping layer will consist of a compacted clay layer of 1 metre thickness, placed on the last levels of the waste (which is often a thicker layer of final cover to provide a uniform level for placement of the material). This capping layer can be replaced or supplemented by '''flexible membranes''' such as LLDPE (Linear Low Density Polyethylene) or GCL (Geo-synthetic Clay) in varying combinations. Flexible membranes can be welded together (or fused) similar to engineering lining systems or laid over-lapped with no fused joints. | Commonly, the capping layer will consist of a compacted clay layer of 1 metre thickness, placed on the last levels of the waste (which is often a thicker layer of final cover to provide a uniform level for placement of the material). This capping layer can be replaced or supplemented by '''flexible membranes''' such as LLDPE (Linear Low Density Polyethylene) or GCL (Geo-synthetic Clay) in varying combinations. Flexible membranes can be welded together (or fused) similar to engineering lining systems or laid over-lapped with no fused joints. Guidance on landfill capping was published by the Engineering Sub-group of the EA/industry Landfill Regulation Group in 2018. | ||
Soil thickness will depend upon the proposed afteruse of the site; uses involving deep-rooted plants will require thicker soils to protect the engineered capping layer from root-penetration. | Soil thickness will depend upon the proposed afteruse of the site; uses involving deep-rooted plants will require thicker soils to protect the engineered capping layer from root-penetration. | ||