Vancouver Landfill Phase 1 Closure Pilot Project Design

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Metro Vancouver

Biosolids as feedstock in developing fabricated topsoils for use in landfill closures represents a major shift in the relationship between biosolids and landfills.  Historically, biosolids were thought as a material that went into landfills, whereas now there is more emphasis on finding opportunities to place biosolids on the surface of the landfill to support closure activities.  This beneficial use has been demonstrated in several projects throughout British Columbia.

Metro Vancouver partnered with the City of Vancouver to use biosolids in the Phase 1 closure of the Vancouver Landfill.  One of the options explored for the landfill soil cover was a mixture of biosolids, sand and potentially a carbon source.  SYLVIS worked with Metro Vancouver to source and identify feedstock ingredients, and developed a model to assess mixing and soil use costs.  Selected feedstock ingredients were used to fabricate soil in the SYLVIS laboratory.  These soil mixtures were analyzed and assessed for their suitability to promote vegetation growth while meeting regulatory requirements.  Based on the results generated, landfill soil cover formulations were identified for testing in a pilot project.  In addition to the soil development and feasibility assessment, SYLVIS designed the pilot project, including a planting plan and technical support document for use in obtaining the regulatory authorization.

SYLVIS’s knowledge and experience in biosolids and biosolids soil products specific to use in landfill closure was used to identify cost effective options that exemplify environmental stewardship.  This project is an example of how one environmental challenge (biosolids management) can be utilized to solve another environmental challenge (landfill closure and aesthetic improvement).