Beneficial Use of Organic Residuals at the Skimikin Landfill

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Columbia Shuswap Regional District

The Skimikin Landfill located near Salmon Arm, British Columbia was closed and capped in 2005.  SYLVIS designed and implemented a fabricated soil for use on the site. The fabricated soil consisted of Metro Vancouver Class A biosolids, chipped wood and sand. SYLVIS determined the ideal formulation of feedstock materials, obtained regulatory authorization, coordinated feedstock delivery, fabricated the soil on-site and ensured regulatory compliance throughout.

When the landfill was closed and capped a passive landfill gas venting system was installed underneath the geomembrane barrier. The Columbia Shuswap Regional District explored alternatives for converting the passive system to a system able to reduce the potential impact of methane emissions to the atmosphere. SYLVIS and Sperling Hansen Associates designed a biofiltration system to adapt and modify the existing system to reduce methane emissions.

The system routes landfill gas through a centralized biofilter to significantly reduce the greenhouse gas potential.  Methanotrophic bacteria in the biofilter convert the methane to carbon dioxide, a less potent greenhouse gas.

As part of the biofilter design SYLVIS determined the optimum biofilter properties, assessed available materials for fabricating biofilter media and determined optimum feedstock ratios. Based on the assessment of ratios, SYLVIS fabricated different biofilter media in our lab to further characterize the feedstock and biocover formulations. Potential biofilter feedstock consisted of fabricated soil made with Class A biosolids from Metro Vancouver, Class A biosolids from the City of Salmon Arm and wood managed at the Salmon Arm Landfill. Work was undertaken in cooperation with the University of Calgary to validate the methane mitigation potential of the biofilter media.