Which geomembrane type is most commonly used as bottom liner material in landfills?

High-Density Polyethylene (HDPE) is predominantly used as the bottom liner material in landfills due to its excellent chemical resistance, durability, and impermeability. HDPE has the ability to withstand the harsh conditions typically found in landfill environments, including exposure to leachate, which can contain various hazardous substances. Its strength and stability make it well-suited for providing a reliable barrier to prevent the migration of contaminants into the surrounding soil and groundwater. Additionally, HDPE liners can be manufactured in varying thicknesses, allowing for flexibility in meeting specific project requirements.

While other geomembrane types, such as Polyvinyl Chloride (PVC), Linear Low-Density Polyethylene (LLDPE), and Polypropylene (PP), have their own advantages and are used in various applications, HDPE is favored for landfill liner systems because of its proven performance over time and strict regulatory compliance. This makes HDPE the standard choice among landfill operators looking to ensure environmental protection.