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Landfill liners are engineered barrier systems placed at the base and sides of a landfill to prevent the migration of leachate and harmful gases into surrounding soil and groundwater. They play a crucial role in the safe disposal of wastes by isolating solid waste from the natural environment and minimizing risks to public health and ecosystems. As waste decomposes in a landfill, liquids percolate through the waste mass and dissolve organic and inorganic contaminants, forming leachate. If uncontrolled, leachate can contaminate groundwater and surface water resources. Landfill liners are therefore designed to act as low-permeability barriers that control the movement of these contaminants and support sustainable waste management practices. The primary functions of landfill liners include containment of leachate, protection of groundwater, structural stability of the landfill, and compliance with environmental regulations. An effective liner system must possess low hydraulic conductivity, chemical resistance, durability, sufficient strength to withstand stresses from waste loads, and compatibility with site-specific conditions such as soil type, climate, and nature of waste. Modern landfills generally ____ __________ ____ ________ _________ ________ ______ ______.
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