The GraniteFuel O₂ Removal System ensures safe, consistent, and high-quality gas for renewable natural gas (RNG) upgrading by eliminating residual oxygen (O₂) from biogas streams. Even trace oxygen can cause performance issues, including membrane damage, oxidation of catalysts, and safety risks during compression or injection. By maintaining oxygen levels within required limits, the system protects downstream equipment and ensures compliance with gas-quality standards for pipeline injection or use in combined heat and power (CHP) systems.
Designed for continuous operation, the O₂ Removal System is applicable across agricultural digesters, wastewater treatment plants, and landfill gas facilities. Each system is engineered to match the site’s gas composition, flow rate, and oxygen concentration, ensuring precise and dependable deoxygenation under variable conditions.
Key Features and Benefits of the O₂ Removal System
High-efficiency deoxygenation process
The system uses a catalytic reduction process to convert oxygen into water vapor and carbon dioxide, safely eliminating O₂ without affecting methane concentration. This ensures gas purity and maintains consistent upgrading performance.
Continuous, automated operation
GraniteFuel’s O₂ Removal System operates automatically under steady or fluctuating flow conditions. Real-time monitoring of gas composition and temperature ensures stable operation without manual adjustments.
Safe and reliable oxygen control
By reducing oxygen content to low parts-per-million (ppm) levels, the system minimizes explosion risk and protects sensitive equipment such as compressors, membranes, and polishing catalysts used in downstream processes.
Corrosion-resistant construction
All wetted components are built from stainless steel and high-temperature-resistant alloys suitable for biogas environments. The robust design maintains long service life and low maintenance requirements.
Compact modular design
Each O₂ Removal System is delivered as a pre-assembled skid with integrated reactors, controls, and safety instrumentation. The modular layout simplifies installation and allows straightforward integration into existing conditioning or upgrading systems.
Optimized for integration with GraniteFuel solutions
The deoxygenation system interfaces directly with VOC and Siloxane Removal, Compression, and Gas Separation Systems as part of GraniteFuel’s complete conditioning and upgrading platform.
O₂ Removal System Applications in Biogas and RNG Projects
Agricultural Biogas and Farm Digesters
Trace oxygen may enter digester biogas from feed leaks or air ingress during agitation. The O₂ Removal System eliminates this oxygen to prevent corrosion and combustion hazards in compressors and upgrading units, ensuring safe and stable operation for farm-based RNG facilities.
Wastewater Treatment and Municipal Facilities
In wastewater plants, oxygen can enter gas streams through air intrusion during digestion or handling. GraniteFuel’s O₂ Removal System maintains low oxygen levels to protect polishing catalysts, improve process reliability, and enhance gas consistency for injection or CHP applications.
Landfill Gas Conditioning and Recovery
Landfill gas often contains oxygen from wellfield leaks or aeration zones. The O₂ Removal System efficiently removes this oxygen to prevent explosive mixtures and maintain safe upgrading performance. Reliable deoxygenation supports continuous operation in landfill gas-to-energy and RNG recovery projects.
Each O₂ Removal System is tailored to the facility’s gas flow and treatment requirements, ensuring safe, efficient, and long-term operation across all biogas applications.
Integration with Other GraniteFuel Systems
The O₂ Removal System is typically positioned near the end of the biogas conditioning process. It complements the VOC and Siloxane Removal System and integrates seamlessly with the Compression and Gas Separation Systems that prepare gas for injection. Unified controls allow real-time coordination across all systems, ensuring efficient operation and continuous safety monitoring.
Common O₂ Removal Questions and Answers
The system passes biogas through a catalyst bed that promotes controlled oxidation and reduction reactions, converting oxygen into water vapor and carbon dioxide. This lowers oxygen content to safe levels and prevents damage to downstream equipment.
Oxygen is an unwanted contaminant that increases corrosion, oxidation, and safety risks in biogas systems. Removing it ensures compliance with gas-quality standards, protects compressors and membranes, and improves process reliability.
Yes. The system is designed for continuous operation under fluctuating flow or oxygen concentrations. Automated temperature and gas monitoring maintain stable removal performance without operator intervention.
Contact GraniteFuel Engineering to learn how our O₂ Removal System can enhance the safety and performance of your biogas and RNG upgrading facility.