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The generation of leachate is a direct result of precipitation. Leachate pumping and treatment represent a significant cost. It is prudent to seal a completed landfill cell with a geomembrane cover to minimize this cost. In addition to keeping precipitation out, a cover also serves to contain methane gas, a natural by-product of waste decomposition. Once contained, the gas can be collected for regeneration or flaring. Products used as landfill covers include |
Landfill Caps: A geosynthetic cover or cap is an umbrella over the landfill to keep water out and thus prevent leachate formation. If a cover is not used or maintained, precipitation will enter the landfill resulting in a buildup of leachate to the point where it overflows its sides and waste enters the environment. Since the cover is directly exposed to the elements, it needs to be resistant to sunlight and natural weathering.
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