Designed and built to BS 4994 or BS EN 13121 and fully compliant with WIMES 8.05, these dry media filters require no routine operator intervention and deliver guaranteed discharge concentrations for hydrogen sulphide (H₂S), odour and VOC emissions. They are used for both primary odour control on smaller airflows and as polishing stages following biological or chemical treatment on larger systems.
Carbon media is selected to match the duty, with alkali‑impregnated grades for H₂S and reduced sulphur compounds and activated carbon grades for VOC removal and odour polishing. Media replacement intervals are defined to suit the required bed life and operating profile, balancing bed depth, footprint and whole‑life cost.
ERG offers a comprehensive range of carbon filters, used as standalone filters or as polishing stages on the discharge from a bio‑trickling filter or chemical scrubber. Odorous and VOC‑laden air is passed through the packed carbon bed, where contaminants are removed by adsorption and, for impregnated grades, by chemical reaction within the media.
All ERG dry media filters are designed to provide stable pressure drop and straightforward media changeout, with access arrangements and nozzles configured to suit site handling constraints. The combination of appropriate media selection, vessel design to recognised standards and WIMES‑compliant configuration provides assured odour control performance and competitive whole‑life costing.
Key benefits of ERG’s range of carbon filters include:
Carbon media is available through our framework media suppliers, including:
ERG has successfully installed over 150 carbon filters across the UK. Performance typically exceeds 99% H₂S and VOC removal efficiency, and an odour discharge of <1,000 ouE/m³ is guaranteed for most applications.
All our systems are custom‑designed for the odour control duty required, and typically include installation of:
Three standard carbon filter configurations are offered – Deep Bed, Dual Deep Bed and Annular – with bespoke designs available for special projects. These configurations allow the system to be optimised for footprint, pressure drop, media utilisation and maintenance access.
Carbon filters are often used as polishing stages downstream of bio‑trickling filters or chemical scrubbers where the upstream process removes the bulk of the contaminant loading and the carbon provides final H₂S and odour reduction to very low discharge concentrations. Standalone carbon filters are typically selected for lower flow, lower contaminant load duties, or where a compact, simple dry media solution is required without liquid effluent.
Carbon media type and bed life are determined from the target contaminants (for example H₂S, mercaptans or VOCs), inlet concentrations, flowrate, required outlet concentration and acceptable pressure drop. Alkali‑impregnated carbon is used where H₂S and reduced sulphur compounds dominate, while activated carbon grades are used where VOC and odour polishing is the primary requirement; bed depth and contact time are then set to achieve the required performance and media replacement interval.
Industrial gas cleaning/Thermal systems
System Maintenance
Odour control
Plastic-GRP Fabrication