O₂ Removal System

Description

O₂ Removal System for Reliable Biogas and RNG Upgrading

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.

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