© 2020 BIOFerm Energy Systems, Inc.

GAS UPGRADING

BIOFerm Suite of Gas Upgrading Systems

Our company’s extensive line of skid-ready systems can uniquely include all necessary upgrading components needed for your specific project. With our systems you can: meet stringent North American pipeline requirements, handle

high-nitrogen gas, remove oxygen from the gas, have a high methane yield and no increased methane losses over time. No matter what your specific needs, our system can be your custom solution.

BIOCarbon X

Carbon Dioxide Removal

  • Capable of meeting stringent pipeline requirements

  • Removes oxygen from the gas

  • Capable of handling high-nitrogen gas

  • In-house volatile organic compound (VOC) removal technology

  • High methane yield and no increased methane losses over time

  • Low operating costs

  • Modular approach

  • Technology emphasis on high processing efficiency

Nitrogen Removal

  • Capable of meeting stringent pipeline requirements

  • Removes oxygen from the gas

  • Capable of handling high-nitrogen gas

  • In-house volatile organic compound (VOC) removal technology

  • High methane yield and no increased methane losses over time

  • Low operating costs

  • Modular approach

  • Technology emphasis on high processing efficiency

GAS UPGRADING

BIOFerm Suite of Gas Upgrading Systems

Our company’s extensive line of skid-ready systems can uniquely include all necessary upgrading components needed for your specific project. With our systems you can: meet stringent North American pipeline requirements, handle high-nitrogen gas, remove oxygen from the gas, have a high methane yield and no increased methane losses over time. No matter what your specific needs, whether it's a turnkey system or an individual technology, BIOFerm can provide you a  custom solution.

PSA (CO2 & O2 FOCUSED MEDIA)

Carbon Dioxide Removal

Our BIO-CO2X is based on the preferred adsorption of carbon dioxide over methane on the internal surface of carbon molecular sieve (CMS) adsorbents. This separation effect is based on both the preferred physical adsorption of CO2 and the difference in size between these molecules. Our PSA gas upgrading unit includes 4-6 adsorber vessels filled with layers of different adsorbent materials, primarily consisting of a dedicated CMS. Each adsorber operates in an alternating cycle of adsorption, regeneration, and pressure build-up during normal operation.

PSA (N2 & O2 FOCUSED MEDIA)

Nitrogen Removal

A BIOFerm single-stage PSA system can typically remove 70-80% of oxygen and nitrogen when air concentrations are up to 5-6% by volume within the raw gas stream, and produce biomethane with>960 BTU/scf. However, in the case of higher air concentrations in the raw biogas stream, the product gas from the first stage PSA unit has to be processed in a second stage PSA unit with similar air rejection rates as the first unit. This allows raw gas containing air concentrations up to 14% by volume to be processed with a product gas having more than 960 BTU/scf.

POLISHING BEDS

Hydrogen Sulfide Removal 

Biogas is heated to a temperature of approximately 140° to 176° F and fed through a vessel filled with catalytic active activated carbon to adsorb hydrogen sulfide and produce sulfur and water through a reaction with oxygen, as shown:

2 H2S + O2 → ¼ S8 + 2 H2O

While water evaporates, the sulfur remains irreversibly in the activated carbon. In cases where the H2S concentrations are high (>400ppm), a biological H2S removal system is added.

Check out BIOFerm's exclusive Sulphur Removal Media.

BIOLOGICAL DESULFURIZATION

Hydrogen Sulfide Removal (>400 ppm)

In cases where the H2S concentrations are high (>400ppm), a biological H2S removal system should be utilized. Biogas is first processed through a continuously-operating bioscrubber with microorganisms that reduce H2S to elemental sulfur. These sulfur-metabolizing microorganisms grow on media inside a polyethylene column where the biogas flows upwards and water flows downward.

REGENERATIVE TSA

VOC's and Siloxanes Removal

This has a thermal swing adsorption (TSA) system with two reactors filled with adsorbent to remove VOC and siloxanes. While one reactor is in operation the second adsorbent bed is regenerated at elevated temperatures by purging with heated off-gas from t the first stage PSA unit. At higher temperatures most of the adsorbed components will desorb and diffuse into the gas phase again. The VOC-laden off-gas from the regeneration process will be destroyed in a recuperative thermal oxidizer.

Check out BIOFerm's exclusive VOC Removal Media.

Interested in BIOFerm Gas Upgrading Technology?