Biogas derived from landfills and from agricultural and wastewater treatment facilities can contain VOCs and siloxanes. As the market for biogas continues to shift to RNG, the removal of VOCs and siloxanes has become important to upgrading systems and the effective operation of the system’s gas permeation membranes.

Membrane processes are one of the most effective means for separating carbon dioxide (CO₂) from methane to upgrade biogas. Harmful VOCs such as ketones can permanently damage them.

VOCs give off a very strong odor. This odor can mask the effects of the odorants added to the upgraded gas as a safety requirement.

VOCs and Siloxanes in biogas are removed with NORIT® RB4 activated carbon which has been optimized for highly efficient adsorption of these impurities.

NORIT RB4 can be regenerated effectively in temperature swing adsorption applications. They can also be used as disposable media in ACT polishing beds.