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MWEA Biosolids and Energy
ConferenceTechnologies for Biogas Conditioning
March 3 and March 4, 2009
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Unison Solutions Overview
� Biogas compression/treatment system design and fabrication (Siloxane, moisture and H2S removal)
� 75 systems in operation� Turnkey waste-to-energy systems� Gas conditioning system components
(suction scrubbers, heat exchangers, filtration, condensate knock-outs, etc.)
� Custom System Design and Fabrication
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Unison Solutions Overview (cont)� Stainless Steel Vessel Fabrication
(ASME Pressure Vessels)
� Capstone MicroTurbine distributor and service provider (10 states)
� Automation and UL panel shop
� Gas testing and analysis
� Multiple awards for Biogas systems (EPA project of the year 2003, 2006 SWANA Gold Award)
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Fabrication Facility
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Assembly and Testing Area 800scfm Gas Treatment System
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A Sampling of Unison Solutions Biogas Projects
WWTF/Industrial Digesters1. Rockford IL-2.25 MW Waukesha Engine CHP2. Milwaukee South Shore – Gas Compression3. Albert Lea MN-4 Turbine CHP 4. Sheboygan WI-10 Turbine CHP 5. St. Petersburg, FL – 9 Turbine CHP6. Tulare CA WWTF-Gas Treatment for Fuel Cells7. Dublin San Ramon CA WWTF-Gas Treatment for
Fuel Cells8. Durango CO WWTF-2 Turbine CHP9. Flagstaff AZ WWTF-Jenbacher Generator CHP10. MMSD-Gas Treatment for Waukesha Gen Sets
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20scfm Gas Treatment System
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Dublin San Ramon CA-WWTF FCE Fuel Cell Installation
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Biogas Treatment Systems
What is driving the need for increased gas treatment on biogas fueled generation and direct use projects?
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Equipment Damage and Performance Issues
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Key System Components
� Hydrogen Sulfide Removal� Moisture Removal� Compressor or Blower� Siloxane Removal� CO2 Removal
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Typical Gas Treatment System
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Why Hydrogen Sulfide Removal?
� Equipment Damage from Corrosion (Hydrosulfuric Acid)
� Health and Safety Issues (1000ppm will cause an individual to go unconscious)
� Odor Control� Causes fouling of siloxane removal
media
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Types of H2S Removal
� Media Based- Iron Sponge- SulfaTreat
� Liquid H2S Removal- SulfrStrip (AFT)- Amine Solutions
� Biological- NATCO Shell-Paques- Amine Solutions- Biothane Biopuric
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MMSD 800scfm Iron Sponge
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Natco Group Amine System
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Biothane Biopuric Biological System
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Why Moisture Removal?
� Prevents condensation downstream� Improves energy content of gas� Condenses into compressors� Formation of weak acids from
interaction with H2S and CO2� Fouling of Siloxane removal systems
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Types of Moisture Removal Equipment
� Knockout� Suction Scrubber or De-mister� Ambient Air Cooler� Refrigerated Dryer� Glycol Chilling
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Suction Scrubber or De-Mister
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Ambient Air Cooler
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Refrigerated Dryer
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Unison “Uni-Chiller” Glycol Chiller
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Why Siloxane Removal?
� Organosilicons produced by Dow Chemical� Used in the manufacture of many commercial
products including: makeup, tooth paste, shampoo, lubricants, etc.
� Present in almost all digester gas from 500ppbv to 140,000ppbv. MM, D4 and D5 account for 75% to 95% in biogas. (2, 4 and 5 silicon atoms per molecule.
� Do not breakdown during processing at WWTFs or in Landfills
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The Problem
�When VOCs and Siloxanes are in the digester gas:
�Combustion of VOCs containing only carbon hydrogen and oxygen forms carbon dioxide and water vapor.
�Combustion of Siloxanes forms carbon dioxide, water vapor, and silicon dioxide, which is a solid and is also the main ingredient in sand. Since this is not a gas, some of it stays in the engine.
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The Damaging Results
� Pressure and temperature transform the Siloxanes into various abrasive silica forms from sand to glass.
� Causes damage to boilers, internal combustion engines and microturbines
� Usage in commercial products is increasing at 5% to 10% annually.
� Problems with Siloxanes are here to stay.
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Siloxane Damaged Piston
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Siloxane Buildup on Cylinder Head
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Silica Layer½” to 1” Thick
Pitting of Boiler Tubes
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Processes for Removing Siloxanesfrom Biogas
� Fixed Bed Carbon Filters (AFT SAG, Calgon, Carbon Air)
� Fixed Bed Silica Gel Bead Filters (AFT)� Regenerated Desiccants (Domnick
Hunter)� Regenerated Carbon (Jenbacher TSA)� Regenerated Graphite (AFT SWOP)� Regeneration with Micro Wave
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AFT SAG Fixed Bed Process
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Jenbacher TSA System
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AFT SWOP Gas Treatment Process
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Unison Typical Gas Treatment
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Why CO2 Removal?
� Opportunity to create a fuel that can be injected into a pipeline
� Create a compressed vehicle fuel equivalent to CNG
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CO2 Removal Processes
� PSA-Pressure Swing Absorption (QuestAir, Molecular Gate)
� Membrane Separation (Air Liquide)� Solvent-Polyethylene Glycol Absorption
(Selexol)
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Quest Air M3100 PSA CO2 Removal System
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QuestAir PSA Process
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End Use Opportunities
� Direct Use-Boiler Fuel� Electrical Generation-IC Engines, Fuel
Cells, Turbines� Distribution Pipeline Injection� Compressed gas for vehicle fuel
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Unison Solutions Project Support Summary
� Biogas compression/treatment system design and fabrication (Siloxane, moisture and H2S removal)
� Blower skids� Gas conditioning system components
(suction scrubbers, heat exchangers, filtration, condensate knock-outs, etc.)
� Vessel Fabrication� Capstone MicroTurbine distributor and
service provider (10 states)� Gas testing and analysis
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TEST and TREAT YOUR BIOGAS
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Unison Solutions Contact Information
Jan Scott and Dave Broihahn