Municipal Solid Waste (MSW) Landfill: virtual
tour
Passive Gas Collection Systems
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 Passive gas collection systems use
existing variations in landfill pressure and gas concentrations to
vent landfill gas into the atmosphere or a control system. Passive
collection systems can be installed during active operation of a
landfill or after closure. Passive systems use collection wells,
also referred to as extraction wells, to collect landfill gas. The
collection wells are typically constructed of perforated or slotted
plastic and are installed vertically throughout the landfill to depths
ranging from 50% to 90% of the waste thickness. If groundwater is
encountered within the waste, wells end at the groundwater table.
Vertical wells are typically installed after the landfill, or a portion
of a landfill, has been closed. A passive collection system may also
include horizontal wells located below the ground surface to serve
as conduits for gas movement within the landfill.
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