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Design, Construction, and Operation of a Landfill Gas Collection System at Highway 101 Landfill

This project involved the design, construction, and operation of a landfill gas collection system at the Highway 101 landfill in Sackville, Nova Scotia by Highland Energy (N.S.) Inc. The system included the installation of wells, electro-fused HDEP pipes, and a gas treatment plant. The landfill operated from 1976 to 1997, with 4 million tons of waste landfilled in a 34-hectare area at depths of 15 to 30 meters. The system design had to consider high leachate levels, requiring special equipment and strategic valve placement for efficient gas collection and natural drainage.

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Design, Construction, and Operation of a Landfill Gas Collection System at Highway 101 Landfill

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  1. Design, Construction and Operation of a Landfill Gas Collection System at the Highway 101 landfill in Sackville, Nova Scotia. Highland Energy (N.S.) Inc.

  2. Construction Nov 2005 – Jan 2006 • Installation of 74 wells • Dec 2005 – Feb 2006 • Installation of 14 000 ft of electro fused HDEP pipe connecting all the wells to a main header line (2 000 ft), terminating at the gas treatment plant

  3. Highway 101 landfill • Landfill operated from 1976 to 1997 • 4 million tons of waste landfilled • Area of landfill: 34 hectares Highland Energy Inc.

  4. Depth: 15 to 30 meters • Leachate treatment plant installed • Passive leachate collection system Highland Energy Inc.

  5. Leachate was not pumped from landfill • Cover was inadequate (landfill was wet) • Leachate level is high in the landfill Highland Energy Inc.

  6. Well and collection system design

  7. The collection system had to be pitched in order to allow the condensate and leachate to drain naturally from the collection system

  8. Collection system • Special drill required because of high leachate level • HDPE pipe used for the collection system • Valves strategically placed to isolate headers • System laid out to allow natural drainage • Each well has: • a valve to regulate flow • a port to sample quality and quantity of the LFG

  9. Diagram of the condensate trap for the collection system

  10. Highland Energy Inc.

  11. Operations • LGC system is monitored daily • Wells are individually checked for CH4 and O2 levels • Leachate level in each well is checked regularly and is pumped with special designed air-driven pumps

  12. Management of the collection of landfill gas is labor intensive and must be micro-managed constantly

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