Activated Carbon for Clean Biogas

H₂S forms during anaerobic digestion of sulphur-containing proteins. Even at low concentrations it corrodes engines, degrades lubricating oil, and produces toxic SO₂/SO₃ in exhaust gases. For biomethane grid injection, H₂S must typically be reduced below 5 ppm.

Ammonia is generated from nitrogen-rich feedstocks such as manure, sewage sludge, and food waste. It causes catalyst poisoning in downstream upgrading systems, promotes corrosion, and results in NOₓ emissions on combustion. Removal is critical for both CHP and biomethane applications.

Siloxanes originate from consumer products concentrated at landfill and wastewater treatment sites. During combustion they oxidise to hard, abrasive silicon dioxide (SiO₂), depositing on pistons, valves and turbine blades, causing rapid and costly mechanical wear.

Volatile organic compounds — including terpenes, alcohols, ketones, and halogenated compounds — cause odour, reduce biogas quality, and foul upgrading membranes. High-surface-area activated carbon physically adsorbs these compounds in a final polishing step before end-use.