Biogas Treatment

Biogas treatment for compressors, gas engines and grid export

ERG designs biogas treatment systems for sewage sludge and municipal waste anaerobic digestion plants, conditioning raw biogas so it can be used reliably in compressors, gas engines or upgraded for grid injection. The wet gas cleaning package brings contaminants and water content within acceptable ranges for downstream equipment, while removing gaseous pollutants such as H₂S and ammonia that would otherwise lead to high SO₂ and NOx emissions after combustion.

To discuss a biogas treatment duty or explore options for an existing or planned AD plant, contact ERG’s sales team.

Wet biogas cleaning and conditioning

The wet gas cleaning train is configured to:

Reduce water content to protect compressors, engines and downstream upgrading equipment.
Remove hydrogen sulphide and ammonia to limit corrosive attack, engine fouling and post‑combustion SO₂ and NOx emissions.

Depending on biogas composition and the desired characteristics of the liquid effluent stream, ERG can provide either a packed tower scrubber package or a V‑tex^® scrubber package. These systems are engineered around real operating conditions, including flow variability, contaminant ranges and duty cycle.

Zero‑effluent and concentrated scrubbing solutions

For sites targeting zero liquid effluent from the biogas treatment plant, ERG can provide a V‑tex^® scrubber operated with a highly concentrated scrubbing solution to minimise effluent volume. The concentrated effluent can then be treated using an evaporator from a partner company to produce a solid, crystalline discharge from the abatement package. This approach reduces or eliminates liquid waste, simplifies effluent handling and can offer lifecycle cost benefits where off‑site liquid disposal is expensive or constrained.