At Rhodes Royce, we design and build complete turn-key biogas upgrading systems that transform raw methane from landfills, dairies, distilleries, and lagoons into clean, high-value Renewable Natural Gas (RNG). Our advanced process chain combines proven technologies for purification, compression, and control automation - guaranteeing 99% runtime, minimal maintenance and predictable performance for every installation. Here are the processes we have installed and commissioned at various RNG plants around the United States:

• Moisture Removal (Dehydration) – eliminates water vapor to prevent corrosion and freezing in downstream equipment.

• Particulate Filtration – removes dust, rust, and other solid contaminants.

• Hydrogen Sulfide (H₂S) Removal – uses amine system with on site regeneration, activated carbon, or biological scrubbers to eliminate corrosive sulfur compounds.

• Siloxane Removal – captures volatile silicon compounds that can damage engines and membranes.

• Carbon Dioxide (CO₂) and Nitrogen Removal / Upgrading – increases methane purity through technologies such as:

  • Membrane Separation

  • Pressure Swing Adsorption (PSA)

  • Temperature Swing Adsorption (TSA)

  • Amine Processing

  • Cryogenic Separation

• Compression – boosts gas pressure for processing, storage, or pipeline injection.

• Oxygen Removal (Deoxygenation) – removes oxygen from biogas via a renewable and extremely effective catalyst process

• Gas Cooling and Condensation – reduces temperature to separate condensate and enhance purification efficiency.

• Gas Polishing / Final Filtration – ensures final gas purity and quality consistency.

• Monitoring & Control Systems (SCADA / PLC) – provides real-time process automation, data logging, and remote performance optimization.

• Odorization (Optional) – adds odorants before distribution to meet pipeline safety requirements.