Desulfurization Technologies for Landfill Gas

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Desulfurization Technologies for Landfill Gas
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Choices for Desulfurization Technologies Depend
Largely on Daily Sulfur Loads

• Very low levels of H2Sless than about 50 pounds
  sulfur (S)/day
• Liquid scavenger The ELIMINATOR
• Low levels of H2Sabout 50 to 300 pounds S/day
• Solid media technology Sulfur-Rite
• Medium levels of H2Sabout 300 pounds to 20 long
  tons S/day
• Iron redox technology LO-CAT or MINI-CAT
• High levels of H2SGreater than about 20 long
  tons S/day
• Claus technology petro-chemical industry, not
  LFG

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Determination of Daily Sulfur Production Rate

• Where
• PPDS Pounds per day of sulfur generated
• MMscfd Gas rate (in million scfd)
• ppmH2S H2S Concentration (in ppm)

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SELECTING THE RIGHT TECHNOLOGY
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Desulfurization Unit Select-A-Guide
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Liquid Scavenger Technologies

• Very low sulfur recovery less than about 50
  pounds/day
• Large waste product stream (liquid) requiring
  disposal
• Technologies include
• The ELIMINATOR
• Marketed by Gas Technology Products
• Uses amine resins
• Others
• Use triazine-based compounds containing
  formaldehyde
• Application
• Liquid spray into the gas or
• Bubble tower

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Solid Scavenger Technologies

• Low sulfur recovery about 50300 pounds/day
• Large waste product stream (solid) requiring
  disposal
• Use iron and/or zinc oxide-based compounds that
  are an improvement over old iron sponge
  technology
• Technologies
• Sulfur Rite
• Marketed by Gas Technology Products
• Application Batch treatment using packed tower

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Iron Redox Technology

• Medium sulfur recovery about 300 pounds to 15
  long tons S/day
• Small product stream Solid sulfur that can be
  used in agricultural applications
• Most appropriate for larger LFG applications
• LFG projects too small for Claus process
• Iron Redox Technologies
• LO-CAT
• Marketed by Gas Technology Products
• MINI-CAT
• Marketed by Gas Technology Products
• Same technology as LO-CAT Modular FRP design
  with lower CAPEX and smaller footprint for LFG
  applications