amarjit s. riat, p.e assistant director solid waste ... · amarjit s. riat, p.e assistant director...
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Direct use of Methane Gas
Amarjit S. Riat, P.E Assistant Director Solid Waste Management Program, Department of Public Works and Environmental Services
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Where is Fairfax County, VA?
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Diversity of Direct Use Projects
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Fairfax County LFG Direct use Projects
• LFG Fuel
• LFG to Heat
• LFG for Arts studio
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Methane-Fuel Project• LFG as fuel source for
combusting sludge at Fairfax County waste- watertreatment plant.
• 3 miles (4.8 km) pipelinewas built to the plant.
• Pipe line cost $1.25 Million• Compressor Station • Cost $1.00 million• Compressor/Dryer• Annual savings over using the utility’s gas: $1 million annually.• Low Pressure Gas: 10 psi• No Problems.
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Methane to Heat Phase I• LFG infrared heater project heats landfill
shop.• Reasonable payback: 5 Years• Less than 30 cfm LFG needed to heat
about 6,500 ft2 (604 m2).• Fuel cost saving $20,000/Year• Minimal gas treatment.• Low sophistication - simple to operate• Maintenance • Problems
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Landfill Maintenance Shop
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LFG Cleaning Process for Shop Heating
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LFG Heater
Overhead heating
system in shop
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Methane to Heat Phase II• County Vehicle Maintenance Garage • 3500 LF pipe line and Compressor Station
for conditioning and conveying gas• Infra-red Heaters 4.52 Million BTU• 100 CFM required to heat 30,000 SFT• Fuel cost Saving $70,000/annually• Total Project Cost $300,000• Minimum maintenance, operating
efficiency 99%
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Methane use at Arts Center (Proposed)
• Glass Blowing• Pottery Studio• Space Heaters
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Questions?Amarjit Riat, P.E.
12000 Government Center ParkwaySuite 458
Fairfax, VA 22035(703) 324-5234
www.fairfaxcounty.gov/dpwes