Landfill Gas

H2S Treatment for Landfill Gas

MV Technologies H2 removal solutions are in use at Landfill sites to treat landfill gas for SO2 emissions compliance as well as use as fuel for boilers or other process equipment, to power generator sets, or to convert to CNG either directly or through utility pipeline.

Odor emissions often are managed at Landfill sites through use of wells, exhaust systems and flares to treat the gases generated in the landfill mass. In certain conditions, the gas that is burned in the flare contains enough H2S to yield over the limit for SO2 conditions in the flare exhaust. Compliance requires reducing the H2S levels before combustion.

Landfill sites can collect the methane-bearing gas produced by bacterial action on the landfill material for use as fuel for boilers or other process equipment, to power generator sets, or to convert to CNG either directly or through utility pipeline transmission.

When used as a fuel source, the presence of H2S in the biogas will have a damaging effect on reciprocating or turbine engine life, increase maintenance costs, and shorten time between rebuilds. Generator set manufacturers have begun setting limits on H2S concentrations as part of their conditions imposed on the user to maintain warranty coverage.

Exhaust limits on SO2 emissions may require H2S reduction prior to combustion even at a flare. If the LFG is converted to CNG, those specifications include low limits on H2S. When the gas is transported via a utility pipeline to a CNG compression station, even lower pipeline specifications will have priority.

Typical User Conditions

Flow rates are typically mid-range to high, 1500scfm to more than 5000scfm. H2S concentrations are typically not extreme, running between 500 and 2000ppm. Importantly, concentrations will vary widely according to landfill cell management.

MVTechnologies H2SPlus systems and SulfAx Systems deliver superior value against these requirements.

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Additionally, in evaluating H2S treatment approaches, an important metric to consider is the Total Cost of Ownership (TCO).

The TCO includes capital cost such as the vessel size, pumps and installation costs, and the operating costs, largely determined by media life and resulting time between replacement -- itself a function of biogas flow rate and H2S concentration. MV's enhanced iron sponge (BAM) media is guaranteed to remove up to 13 pounds of H2S per cubic foot, one of the highest removal efficiencies in the industry.

Click here to calculate cost based on annual pounds of H2S removed for your project

Cost elements often overlooked during comparison of H2S treatment approaches:

  • Power costs – increase in pressure drop can result in increase in power costs
  • Lost Revenue due to system downtime – maintenance/media changes
  • Replacement of proprietary nutrients and/or chemical/caustic
  • The costs of testing for warranty or regulatory requirements
  • Operator attention time – it is not “free”

Click here to view H2S Removal Technologies Comparison Matrix