Municipal Solid Waste (MSW) Landfill: virtual
tour
Active Gas Collection
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 Well-designed active collection systems
are considered themost effective means of landfill gas collection
(US EPA 1991). Active gas collection systems include vertical
and horizontal gas collection wells similar to passive collection
systems. Unlike the gas collection wells in a passive system,
however, wells in the active system should have valves to regulate
gas flow and to serve as a sampling port. Sampling allows the
system operator to measure gas generation, composition, and pressure.
 Active
gas collection systems include vacuums or pumps to move gas out
of the landfill and piping that connects the collection wells to
the vacuum. Vacuums or pumps pull gas from the landfill by creating
low pressure within the gas collection wells. The low pressure
in the wells creates a preferred migration pathway for the landfill
gas.  The size, type, and number of vacuums required in an active
system to pull the gas from the landfill depend on the amount of
gas being produced.With
information about landfill gas generation, composition, and pressure,
a landfill operator can assess gas production and distribution
changes and modify the pumping system and collection well valves
to most efficiently run an active gas collection system. The system
design should account for future gas management needs, such as
those associated with landfill expansion.
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