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Single-liner systems are generally used in landfills which hold rubble waste from construction. Landfills with single-liner systems are not designed to contain harmful liquid wastes such as paint or tar that could easily seep through a single-liner system. Double-liner systems are usually found in municipal solid waste landfills, as well all ...
Due to the difficulty of constructing a single large scale impermeable layer without any defects, a double liner system is more robust, as it can deal with leakage through the primary liner. A double liner system is required by the United States EPA for landfill, surface impoundments, and waste piles. [2]
Once a landfill site is full, it is sealed off to prevent precipitation ingress and new leachate formation. However, liners must have a lifespan, be it several hundred years or more. Eventually, any landfill liner could leak, [7] so the ground around landfills must be tested for leachate to prevent pollutants from contaminating groundwater.
To effectively serve the purpose of containing leachate in a landfill, a liner system must possess a number of physical properties. The liner must have high tensile strength, flexibility, and elongation without failure. It is also important that the liner resist abrasion, puncture, and chemical degradation by leachate.
Geomembrane installation as part of the construction of a base liner system of a landfill [2] Geomembranes have been used in the following environmental, geotechnical, hydraulic, transportation, and private development applications:
Similar to in situ mining, heap leach mining differs in that it places ore on a liner, then adds the chemicals via drip systems to the ore, whereas in situ mining lacks these liners and pulls pregnant solution up to obtain the minerals. Heap leaching is widely used in modern large-scale mining operations as it produces the desired concentrates ...
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Final cover is a multilayered system of various materials which are primarily used to reduce the amount of storm water that will enter a landfill after closing. Proper final cover systems will also minimize the surface water on the liner system, resist erosion due to wind or runoff, control the migrations of landfill gases, and improve aesthetics.
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