These systems are designed for highly contaminated odorous air streams containing hydrogen sulphide (H₂S), reduced sulphur compounds, soluble VOCs and ammonia, and are engineered to deliver stable long‑term performance with low operating costs. Filled with durable, bio‑inert pumice media, ERG bio‑trickling filters are specifically configured to provide outstanding value for money and simple operation on municipal wastewater, industrial effluent and process odour duties.
Performance typically exceeds 99% H₂S removal efficiency, and in combination with downstream carbon filters an odour discharge of less than 1,000 ouE/m³ is guaranteed and comfortably achieved. This makes bio‑trickling filters well suited to wastewater odour control, sewage treatment works, sludge handling and other odorous air pollution control applications where high H₂S removal is required.
Used as a stand‑alone package, or with dry media polishing filters, ERG’s bio‑trickling filters provide trouble‑free odour control for highly contaminated, small to medium air flowrates. A specially selected cocktail of bacteria, enzymes and nutrients is pre‑seeded into the bio‑trickling filter to ensure rapid development of odour‑neutralising bacteria which colonise the media bed.
The bacteria digest the odour‑causing compounds, which typically include H₂S, mercaptans, organic sulphides, soluble VOCs and ammonia. The optimised environment for bacterial activity is maintained by controlled irrigation with filtered final effluent, or with water dosed with low‑level nutrients if no final effluent is available. Designed and built to BS 4994 or BS EN 13121 and fully compliant with WIMES 8.05, ERG bio‑trickling filter systems offer assured performance and competitive whole‑life cost.
All our systems are custom‑designed for the odour control duty required, and typically include installation of:
This scope allows the bio‑trickling filter to be integrated as part of a complete odour control system for wastewater, municipal waste and other industrial odour control applications.
The absorption of contaminants into the bio‑film around the media and subsequent biological aerobic degradation forms a stable (usually acidic) effluent which is released to drain, and the bio‑trickling filter is optimised to ensure an acceptable pH in the effluent stream. If filtered final effluent is not available, ERG can provide a nutrient dosing system.
Product brochures can be downloaded from here.
A bio‑trickling filter is typically preferred where odorous compounds such as H₂S, mercaptans and biodegradable VOCs are present at low to medium concentrations and a sustainable, low‑chemical‑use solution is required. Chemical scrubbers may be selected instead where fast start‑up, non‑biodegradable pollutants or unusual operating conditions make biological treatment less suitable.
ERG’s standard bio‑trickling filter range covers flowrates up to around 3,000 m³/hr for cylindrical vessels and up to 25,000 m³/hr or larger for modular sectional tanks. The units can reliably treat high levels of contamination, typically over 200 ppm H₂S, while maintaining >99% H₂S removal efficiency and high overall odour removal.
Industrial gas cleaning/Thermal systems
System Maintenance
Odour control
Plastic-GRP Fabrication