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GAS COLLECTION FROM BIOREACTOR LANDFILLS
Eric Peterson, P.E.
February 28, 2003
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INTRODUCTION
Gas Collection Challenges
Gas Collection Options
Regulatory Issues
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GAS COLLECTION CHALLENGES
Higher Gas Temperatures
Higher Gas Production Rate (more gas more quickly)
Higher Liquid Levels
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Drill Cuttings from gas well with temps > 150º F
HIGHER TEMPERATURES
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LEACHATE FILLED
EXTRACTION TRENCH
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GAS PRESSURE
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GAS COLLECTION OPTIONS
Vertical Wells
Horizontal Collectors
Interconnection with leachate system
Common Conduit - HYEX® System
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DUAL CONDUITCommon trench or piping for gas collection and liquids addition
HYEX® System uses common carrier drain pipe for separate liquid injection and gas collection pipes.
Demonstration at Ste. Sophie Landfill, Quebec and Fauquier County, VA
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Interior of HYEX
reinforced landfill
conduit; 12 inch ID
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Terminal end of HYEX
conduit with liquid and gas lateral lines and optional
CCTV insertion lateral.
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SYSTEM MODIFICATIONS
Model gas generation with higher k valueIncrease header pipe sizes accordingly
More flowMore settlement
Larger well pipe diameter for pumpingHigh temperature materials for wells - CPVC, Fiberglas
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OTHER TECHNIQUES
Emissions control via biocovers
Compost cover material
Oxidizes methane as gas passes through
Aerobic reaction
EREF Funded research ongoing at Outer Loop Landfill
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MACT RULE APPLICABILITY
NSPS sites with >50Mg NMOC
Major Source or co-located with major source
Additional requirements for bioreactors, defined as taking liquids besides leachate and achieving moisture content of 40%
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MACT RULE REQUIREMENTS
New Sources (after 11/7/2000)
Install gas collection system prior to liquid addition.
Start collecting gas within 180 days of liquid addition OR
Within 180 days of reaching 40% moisture content.
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MACT RULE (CONT.)Existing Sources
If already adding liquids, install gas collection system within 3 years of 1/16/2003.If not, install gas system before adding liquids.Start collecting gas within 180 days of liquid addition or achieving moisture content of 40%
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MACT Rule (cont.)
Prepare and maintain a SSM plan
Comply with other NSPS requirements
Extend gas collection into new cell or area of bioreactor before initiating liquids injection.