Municipal – Landfill Gas Assessments March 13, 2013

LANDFILL GAS ASSESSMENTS

In 2010, ARRA funding was allocated for the purpose of conducting engineering assessments of the MSW landfills to determine what improvements could be made to increase methane output and potential capture for beneficial use: either renewable electricity generation, for processing into transportation fuel, or for direct use as heating fuel.

The Key Road landfill study found the actual gas flow rate to be 340 SCFM at 20% methane. Estimated costs of system upgrades to improve methane collection were $120,000; the resulting output is uncertain. The city’s adjacent Intrenchment Creek WRC could use electricity produced through a WTE project. However, the plant does not use natural gas, nor does it produce biogas, as the station is primarily used as a pumping station to direct flow to the city’s South River WRC.

The Gun Club Road study found the current gas flow rate to be 228 SCFM at 27% methane. Estimated costs of system upgrades to improve methane output and collection were $230,000. The closest city user is RM Clayton WRC located 1.9 miles from the landfill. The Cascade Road landfill study found the current gas flow rate to be 74 SCFM at 27% methane. Estimated costs of system upgrades to improve methane output and collection were $241,000. The above improvements would be required before the actual methane recovery potential could be confirmed. With the increasing focus on landfill emissions, it would be desirable to improve the collections at the city;s closed MSW landfills.

The current plan is to roll potential small-scale landfill gas recovery projects into the scope of an energy services contract if opportunities can be identified related to beneficial use of remaining biogas production for transportation fuel or other energy recovery. These efforts would help the city to reduce its greenhouse gas emissions from landfill methane while providing a potential source of renewable energy.

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