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Landfill: Difference between revisions
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Landfill sites that incorporate engineered barriers are known as “'''containment facilities'''”. The design of such facilities has more than one form and can incorporate different numbers of layers and different designs. These layers are conventionally known as the “'''landfill lining system'''”.<br> | Landfill sites that incorporate engineered barriers are known as “'''containment facilities'''”. The design of such facilities has more than one form and can incorporate different numbers of layers and different designs. These layers are conventionally known as the “'''landfill lining system'''”.<br> | ||
The [[Landfill Directive]] sets out minimum requirements for site engineering. In simple terms, all sites require a "geological barrier" and some sites are additionally required to have an "artificial sealing liner". The most common manner in which these requirements are | The [[Landfill Directive]] sets out minimum requirements for site engineering. In simple terms, all sites require a "geological barrier" and some sites are additionally required to have an "artificial sealing liner". The most common manner in which these requirements are dealt with is by having a clay liner of 1m metre thickness of low permeability engineered clay (permeability of less than 1x10-9 metres per second) overlain with 2mm thick welded HDPE (high density polyethylene) lining membrane. Typically, this would be further overlain with a geotextile protection layer and then a drainage layer of aggregate and pipework. | ||
The design employed at any particular landfill would be informed by the outcome of the HRA which would assess the likely impact of a site upon the environment taking account of the design proposed. In general terms, the most sensitive sites would require the greatest degree of engineering. | The design employed at any particular landfill would be informed by the outcome of the HRA which would assess the likely impact of a site upon the environment taking account of the design proposed. In general terms, the most sensitive sites would require the greatest degree of engineering. | ||