Off-site landfill gas (LFG) migration is usually best controlled at its source by installing a collection system in the landfill. If this fails, however, off-site migration can be controlled by intercepting the migration pathways with either passive or active extraction wells and/or trenches. The active systems are normally designed with an exhauster, which pulls LFG through the extraction wells or trenches and either vents it to the atmosphere or sends it to a control device ( e.g., a flare). This paper presents an alternative active system design, which utilizes a blower to push air into injection wells, thus cutting off LFG migration pathways with an air barrier.
Presented at Wastecon