Combustion Research Associates

Biological Biogas Scrubber

CRA’s Biological Scrubbers use naturally occurring sulfur-oxidizing bacteria to remove hydrogen sulfide (H₂S) and other sulfur compounds from biogas streams—without chemicals. Engineered with controlled packed-bed environments, optimized nutrient dosing, and high-surface-area media, these systems convert H₂S into sulfate or recoverable sulfur with exceptional stability and efficiency. Designed for low OPEX and high uptime (>98%), CRA biological scrubbers offer a sustainable, low-maintenance alternative to chemical treatment. They are ideal for agricultural digesters, food-waste plants, municipal wastewater facilities, RNG/Bio-CNG projects, and industrial anaerobic reactors. With corrosion-resistant construction, automated control, and decades of gas treatment expertise, CRA delivers robust, scalable solutions for clean and compliant biogas processing. Applications: H₂S removal, sulfur compound treatment, odour control, biogas pre-treatment before engines, turbines or upgrading systems. Industries: Biogas, RNG/Bio-CNG, Landfill gas, WWTP, Agriculture, Food waste plants, Industrial digesters.