GAS UPGRADING

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

High Plains Bioenergy_Carbotech PSA_PSA

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

BIOVIS Suite of Gas Upgrading Systems

Our company’s extensive line of BIOVIS 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.

CARBON DIOXIDE REMOVAL

PSA (CO2  & O2 Focused Media)

Our BIOVIS carbon dioxide removal system 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.

NITROGEN REMOVAL

PSA (N2 & O2 Focused Media)

A BIOVIS single-stage PSA system can typically remove 40-60% of oxygen and nitrogen when air concentrations are up to 4-5% 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.

HYDROGEN SULFIDE REMOVAL

Xpel Media Beds

Biogas is heated to a temperature of approximately 100° to 150°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 can be added.

Check out BIOFerm's exclusive SulfXpel Media.

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Biological Desulfurization

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

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VOC & SILOXANE REMOVAL

Xpel Media Beds

This has a BIOVIS thermal swing adsorption (TSA) system with two reactors filled with SiloXpel 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 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 thermal oxidizer.

Check out BIOFerm's exclusive SiloXpel Media.

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