Biogas Purification

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Technology for cleaning and upgrading biogas

Johan Beyer & Bill Brown

Terracastus Technologies
• Founded by Volvo Technology
Transfer and Mack Trucks

• Patented technology • Winner of R&D 100 Award

Why use biogas?
• Global warming - CO2 emissions • Rising prices of fossil fuels • Independence from fossil fuel - locally produced biofuel • Lower cost of operation

Why clean and upgrade biogas?
• Low energy density - only 40-60% methane • Contaminants detrimental to engine life • Upgraded biogas suitable as transportation fuel

LNG benefits
• LNG is cheaper and easier
to distribute than CNG

• A proven fuel for heavy vehicles such
as trucks and buses

• Easily converted to CNG at fueling sites • Lower environmental impact than fossil fuels

Business structure
Terracastus Technologies

License Fee

Equipment

LNG $

Third Party Buyer (TBD) • Buyer of LNG • Transported from facility or fueled on-site

Land lease fee Raw LFG fee

Landfill Owner
Raw LFG Land for facility

J/V Biogas LLC
LNG $ Landfill Fleet • Fleet of LNG powered refuse trucks • Fueled on-site

CO2 Wash® Enabling Technology
SYSTEMS INTEGRATION ENABLING TECHNOLOGY OPPORTUNITY FEEDSTOCK RENEWABLE PRODUCTS

Residual CO2 Removal
MODULE

Electricity Methane Liquefaction
MODULE MODULE

Chemicals Transportation Fuels Synthesis Gas Hydrogen Steam Liquid CO2

Biogas

CO2 Wash
MODULE

Power
MODULE

Synthesis
MODULE

CO2 Wash® Process
CH4, CO2 (no VOC’s)

Refrigeration Liquid CO2 (no VOC’s)

Dry, Compressed Bio Gas with VOC’s Liquid CO2 and VOC’s

CH4, CO2 (no VOC’s)
Refrigeration

Liquid CO2 Wash® Process
Simple, conventional, robust VOC’s removed from Bio Gas
(Volatile Organic Compounds)

Liquid CO2 (no VOC’s)

Liquid CO2 without recompression Liquid CO2 inert, not combustible 99+% methane recovery 60+% CO2 recovery Solvent Regeneration Eliminated Dry, Compressed Bio Gas with VOC’s

Liquid CO2 and VOC’s

LFG to LNG CO2 Wash® Process
refrigeration

70% Methane 30% CO2 A
Food Grade liquid CO2 H2S Removal

Landfill Gas
water

Compression and Dehydration CO2 + VOC’s to flare Contaminant Free CH4, CO2 Liquefaction

Recycle

A

Membrane

LNG
methane

Typical gas qualities
Raw biogas
• • • • • •
Methane Carbon dioxide Oxygen Nitrogen Siloxanes Sulfur in raw gas 40-60% 30-40% < 2% < 10% 2-5 ppm < 50 ppm

Terracastus upgraded LNG
• • • • • •
Methane Carbon dioxide Oxygen Nitrogen Siloxanes Sulfur in raw gas 98-99% N.D (det.limit 0.1%vol). N.D (det.limit 0.1%vol). < 2% N.D (det.limit 5 ppb). N.D (det.limit 50 ppb).

The Terracastus process
• Pilot Plant co-funded by U.S. Department of Energy • Upgrading Landfill Gas to Liquid Methane (“LNG”) truck fuel at Burlington County

Positive test results
• Sample refuse trucks accumulated more
than 600 hours of operation per vehicle using produced fuel

• Post analysis showed no degradation
of engines

• Liquid CO2 used for crop growth
research at Burlington County

The test in figures
• Raw LFG processed: • Methane liquefied: • Fuel quality: • Production: • Truck service: • Engine inspection: 70 scfm 350 gallon/day 98-99% CH4 10,000 gallons > 600 hours each clean

Offer
• Biogas cleaning and LNG facility • High methane recovery • LNG production: 9500/19000/38000 liters per day

• Raw biogas volume:
500/1000/2000 Nm3/h

Contact information johan.beyer@terracastus.com Booth B10:19

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