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Design, Construction and Operation
of a Landfill Gas Collection System
at the Highway 101 landfill in
Sackville, Nova Scotia.
Highland Energy (N.S.) Inc.
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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
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Highway 101 landfill
Landfill operated from 1976 to 1997
4 million tons of waste landfilled
Area of landfill: 34 hectares
Highland Energy Inc.
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Depth: 15 to 30 meters
Leachate treatment plant installed
Passive leachate collection system
Highland Energy Inc.
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Leachate was not pumped from landfill
Cover was inadequate (landfill was wet)
Leachate level is high in the landfill
Highland Energy Inc.
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Well and collection system design
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The collection system had to be pitched in order to allow the condensate and leachate to drain naturally from the collection system
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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
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Diagram of the condensate trap for the collection system
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Highland Energy Inc.
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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
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Management of the collection of
landfill gas is labor intensive and
must be micro-managed constantly