Landfill Methane Outreach Program
Crow Wing County Small On-site Boiler Project
- Brainerd, Minnesota
- End User(s):
- Crow Wing County
- Crow Wing County SLF (new)
- Landfill Size:
- 720,000 tons waste-in-place (2009)
- Project Type:
- Project Size:
- 30 standard cubic feet per minute (scfm)
- $5,000 per winter season
- Environmental Benefits:
- Carbon sequestered annually by 750 acres of pine or fir forests, annual greenhouse gas emissions from 680 passenger vehicles, or carbon dioxide emissions from 8,200 barrels of oil consumed. Annual energy savings equate to heating 100 homes. Estimated emissions reductions of 0.001 million metric tons of carbon equivalents.
- LMOP Partners Involved:
- LFG Specialties, L.L.C., TerraPass, Inc., R.W. Beck
- Last Updated:
Crow Wing County has been an innovator in waste management in Minnesota for many years, with the latest innovation being an on-site landfill gas (LFG) recovery project. In December 2008, a gas collection and control system was installed; in October 2009, a boiler fueled by LFG began operating to heat on-site buildings. The use of this boiler offsets much of the landfill's natural gas consumption.
While this small landfill is not required to collect and combust LFG, the leachate recirculation system used since 1998 has sped up the generation of LFG, leading the County to install 10 gas wells to collect LFG for use in the boiler. While typical LFG-fired boilers are designed to process large amounts of LFG (e.g., 2,000 scfm), this boiler was designed primarily to use a much smaller expected throughput of 30 scfm. The boiler is used primarily to heat a maintenance building via an in-floor heat system. The amount of natural gas used by the facility has been reduced by nearly 70 percent since the implementation of the project.
In addition to methane destruction, the project has also led to a reduction in volatile organic compound (VOC) concentrations; VOC concentrations in 2004 were more than 75 percent less than concentrations measured in 1997. The project has economic benefits as well. Because of the landfill's verified emissions reductions, the County was able to negotiate an agreement with TerraPass to sell 17,000 metric tons of carbon dioxide equivalents in carbon credits in 2009. The reduction in heating costs is expected to save the County $5,000 annually, which, in addition to the revenues from the carbon credits, will allow the County to pay off the system in an estimated 8 to 9 years.