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Landfills are one of the most commonly used methods of solid waste disposal across the world, and their design plays a crucial role in ensuring environmental protection. A landfill is essentially an engineered site where solid waste is isolated from the surrounding environment until it is safe. The main environmental risks associated with landfills arise from leachate and gas generation. Leachate, a liquid that drains or ‘leaches’ from a landfill, can contaminate soil and groundwater if not properly controlled. To address these risks, landfill liners are installed as barriers that prevent the migration of contaminants from the waste body into the soil and water systems. These liners form an integral part of landfill engineering and are designed with multiple layers and materials to achieve maximum containment. Their effectiveness depends on the type of liner, material used, construction method, and long-term stability. The classification of landfill liners provides a systematic way to understand the different approaches used for containment depending on the nature of waste and environmental sensitivity of the disposal site. The fundamental purpose of a landfill liner is to serve as a barrier between the waste and the environment. Liners must have low permeability to restrict leachate movement, strong mechanical strength to withstand waste load, and chemical resistance to degradation caused by waste by-products. Since landfills handle different categories of wastes such as municipal solid waste, industrial residues, and hazardous waste, the liner design varies accordingly. The classification of landfill liners broadly includes natural liners, synthetic liners, and composite liners. Each category comes with its unique characteristics, advantages, and limitations, and their use depends on regulatory requirements, cost considerations, and environmental conditions. The first category is natural liners, also known as compacted clay liners (CCLs). These liners are constructed from natural clay soil which is compacted to achieve a low hydraulic conductivity. Clay has the advantage of being relatively cheap and locally available in many areas. Its small particle size and ability to swell when in contact with water makes it effective in reducing permeability. A typical compacted clay liner may have a thickness ranging from 0.6 meters to 1.5 meters depending on regulatory _________ _____ _______ __________ __________ __________ _______ ____.
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