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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 fact is, leachate collection systems can clog up in less than a decade and, when that happens, fluids begin to build up inside the landfill--a dangerous situation, as we have noted above. Leachate collection systems fail in several known ways.ince the oldest leachate collection systems date from the early 1970s, humans have very little experience with the long-term performance of leachate collection systems. The hope is that a filter layer will solve the siltclogging problem, but after many decades the entire filter layer itself may clog.