Beneficial use of Organic Residuals at the Salmon Arm Landfill

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Columbia Shuswap Regional District

The Columbia Shuswap Regional District (CSRD) updated its Design and Operating Plan for the Salmon Arm Landfill. Within the Plan, SYLVIS reviewed and advised on the opportunities for reusing organic residuals at the landfill in development of fabricated soil for use in final closure and biocover for mitigating fugitive methane emissions.

A soil can be produced for landfill closure consisting of a source of nutrients such as biosolids or septage, a carbon source such as wood or construction and demolition waste and a structural component such as sand. SYLVIS reviewed different scenarios for the fabricated soil and compared the predicted soil quality to the requirements of the British Columbia Organic Matter Recycling Regulation (OMRR).

Similar feedstock used to develop fabricated soil can also be used to create biocover. In biocover development the ratio of the feedstock residuals is selected to encourage the growth of methanotrophs - bacteria that consume methane. SYLVIS completed research into the optimum physical, chemical and biological properties of biocovers and assessed different combinations of residuals to formulate an efficient and effective biocover for the CSRD landfill.

Application of biocover to the top of a landfill helps to mitigate the release of greenhouse gas to the atmosphere.

SYLVIS reviewed the regulatory constraints and approval mechanisms and provided recommendations to facilitate the use of organic residuals and allowed the CSRD to move forward in the creation of biocover and fabricated soil for use at the landfill.