Biogas Desulfurization & Biological Scrubber (BDS Series)
EnvironTec Biological Biogas Desulfurization System (Biological Scrubber / BDS Series) removes ≥99% of Hydrogen Sulfide (H2S) from raw biogas using autotrophic sulfur-oxidizing bacteria (SOB). Standard models (BDS-30 to BDS-170, representing 30 m³ to 170 m³ of active biological packing volume) are sized on a baseline of 2,500 ppm inlet to ≤200 ppm outlet H2S, with proportional scaling for higher H2S loads. Built with seamless spiral-wound PP-H vessels (Φ2.5m to Φ3.9m, 20-year life) and AI-PID micro-oxygen control, it cuts chemical OPEX by 70% (<$0.003/Nm³) with zero hazardous sludge.
Standardized packing volume (30–170 m³) + Custom-Made multi-tower trains.
Seamless spiral-wound PP-H or SS304/316L tower with 20-year service life.
Requires only trace NPKR microbial catalyst & controlled micro-air.
Auto plate heat exchanger + titanium electric heater + G+F pH/ORP sensors.
Standard Models, Dimensions & Technical Specifications
| Standard Model & Tower Size | BDS-30 (Φ2.5×7.5m), BDS-45 (Φ2.5×10.5m), BDS-60/65 (Φ2.9×11.0m), BDS-80 (Φ2.9×13.5m), BDS-100 (Φ3.5×11.5m), BDS-125 (Φ3.5×14.0m), BDS-150 (Φ3.5×16.5m), BDS-170 (Φ3.9×16.5m) & BDS-Custom-Made |
|---|---|
| Founder's Sizing Rule | Baseline: Inlet H2S = 2,500 ppm -> Outlet = 200 ppm. At 500 m³/h: 2,500 ppm -> BDS-60/65 (60m³ packing); 1,250 ppm -> BDS-30 (30m³); 5,000 ppm -> BDS-125 (125m³) |
| Inlet H2S Capacity | 500 ppm – 15,000 ppm (Higher loads via custom packing volume) |
| Outlet H2S Guarantee | ≤ 200 ppm standard | ≤ 20–50 ppm deep biological | < 5 ppm paired with DT/ACF |
| Tower Shell Material | Homopolymer Polypropylene (PP-H) Spiral Wound or SS304/316L Stainless Steel |
| Optimal Reaction Temp | 32°C – 36°C (Equipped with heat exchanger, insulation & electric heater) |
| Operating Cost (OPEX) | < $0.003 / Nm³ (< ¥0.02 / Nm³) — Approx. 0.4 L NPKR nutrient per kg H2S removed |
| Standard Scope & Options | Tower, structured packing, circulation/flush pumps, Roots air blower, heater, G+F pH/ORP/Temp, Siemens PLC. Optional: E-Care™ IoT, CH4/H2S/O2 online gas analyzer |
Technology & Lifecycle ROI Comparison Matrix
| Technology / Series | Capacity / Range | Performance / Lifespan | OPEX / Engineering Feature | Key Application Advantage |
|---|---|---|---|---|
| EnvironTec BDS Biological Scrubber | 500 – 15,000 ppm | ≥ 99% (<20–200 ppm) | Ultra-Low (<$0.003/Nm³) | Zero Toxic Sludge; 8–14 Months ROI |
| Wet Caustic Scrubbing (NaOH) | 1,000 – 10,000 ppm | 95% – 98% | Very High ($0.015–$0.03/Nm³) | High-Salinity Hazardous Alkaline Wastewater |
| Dry Iron Oxide Scrubber (DT) | < 1,000 – 1,500 ppm | 98% – 99% | High Media Replacement Cost | Ideal for low-flow or final polishing stage |
Engineering & Sizing FAQ
Q: How is an EnvironTec BDS Biological Scrubber sized for different H2S concentrations?
Our BDS model number corresponds directly to the effective biological packing volume (m³). Under the standard design baseline (inlet 2,500 ppm H2S reduced to 200 ppm), a 500 m³/h biogas stream requires 60 m³ of packing (Model BDS-60/65, Φ2.90m × 11.00m). If inlet H2S is halved to 1,250 ppm, required packing halves to 30 m³ (Model BDS-30, Φ2.50m × 7.50m). If inlet H2S doubles to 5,000 ppm, required packing doubles to 120 m³, selecting Model BDS-125 (125 m³ packing, Φ3.50m × 14.00m).
Q: What if our project requires outlet H2S below 50 ppm or 5 ppm for CHP engines or RNG?
For strict outlet specifications (<50 ppm or <5 ppm), we offer two proven configurations: (1) Expanding the biological residence time (BDS-Custom-Made), or (2) A 'Biological Roughing + Dry/Carbon Polishing' train combining a standard BDS scrubber with our DT Dry Scrubber or ACF Active Carbon Biogas Filter.