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Guild Associates, Inc.
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Guild - Landfill Gas Upgrading Technology

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Technology to satisfy California Rule 21 and Rule 30 for RNG pipleine injection. While digesters normally require only carbon dioxide (CO2) removal from the product gas, landfills generally have issues with both CO2and nitrogen (N2) in the feed gas.  Guild Associates` approach to landfill gas upgrading is flexible depending on the needs of the customer.

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Guild Associates has executed dual-Pressure Swing Adsorption (PSA) systems, pairing the Molecular GateTM CO2 technology with N2 rejection.  Contact Guild Associates for an equipment solution to match your needs.

This short video from the Billings Tribune details the operation of the Guild Associates dual-PSA system at the Billings, MT landfill.

The unique dual-PSA approach results in a simplified system that is easy to maintain and operate.  The feed gas is compressed then cooled in order to remove the bulk of the moisture in a condensate trap.  The resulting feed gas is then re-heated using the waste heat of the compressor and fed to the CO2 PSA. The CO2 PSA utilizes the Molecular Gate  adsorbent that has been pore-sized controlled to preferentially adsorb CO2, permitting the methane and nitrogen pass.  In the CO2 PSA step, CO2 is removed from a typical 35% - 45% range down to less than 1%, the CO2 level is selectable by the owner/operator.  Also removed in this step is residual moisture (to
The Guild Associates` Molecular Gate technology enables the system to be efficient, easy to operate and maintain. There is no media to replace on a regular basis, as the Molecular Gate media is regenerable and will last the lifetime of the equipment.

The product gas from the CO2 PSA is fed to the Equilibrium N2 PSA which removes the nitrogen and oxygen to pipeline quality.  The resulting product gas of the N2 PSA is compressed for injection into natural gas grid.  The methane recovery of the Equilibrium N2 PSA is typically better than 97%.  The overall dual-PSA plant methane recovery is about 93%.