What is the primary difference between single liners and double liners?

The primary difference between single liners and double liners lies in their construction. Single liners consist of one barrier layer designed to prevent leachate from contaminating groundwater. In contrast, double liners include two barrier layers that are separated by a drainage layer, which facilitates the management of leachate. This drainage layer not only serves to collect and convey any leachate that may penetrate the first liner but also allows for monitoring and management of potential leaks, enhancing the overall protective function of the landfill system.

By providing an additional layer of protection and a means for leachate management, double liners are typically viewed as a more comprehensive solution for minimizing environmental impact compared to single liners, which do not have this added feature. This distinction is crucial for landfill design, especially in areas where groundwater is a significant concern, as it directly relates to the safety and efficacy of waste containment.