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Leachate Collection. Leachate is liquid generated from rainfall and the natural decomposition of waste that is filtered through the landfill to a leachate collection system. The leachate collection system's job is to direct the leachate to collection sumps so it can be properly removed from the landfill.The leachate collection system is designed with a minimum 2 percent slope to drain to collection sumps. A leachate collection sump consists of an HDPE riser and submersible pump.Leachate drains to the leachate collection system, where it is transferred to a central collection pump and piped to an onsite holding tank or it can be re-circulated in the areas underlain by Subtitle D liner system. leachate collection sump consists of an HDPE riser and submersible pump. Leachate drains to the leachate collection system, where it is transferred to a central collection pump and piped to an onsite holding tank or it can be re-circulated in the areas underlain by Subtitle D liner system.
The collection pipe network of a leachate collection system drains, collects, and transports leachate through the drainage layer to a collection sump where it is removed for treatment or disposal. The pipes also serve as drains within the drainage layer to minimize the mounding of leachate in the layer.he leachate drainage system is responsible for the collection and transport of the leachate collected inside the liner. The pipe dimensions, type, and layout must all be planned with the weight and pressure of waste, and transport vehicles in mind. The pipes are located on the floor of the cell.