Biogas Refining

• Membrane Separation: In the initial stage, raw biogas (primarily methane (CH4) and carbon dioxide (CO2), with trace impurities) is passed through specialized polymer membranes. These membranes exhibit selective permeability, allowing CO2, water vapor, and other smaller molecules like hydrogen sulfide (H2​S) to pass through more readily than CH4. This results in a methane-enriched stream on one side of the membrane and a CO2-rich permeate on the other.
• Pressure Swing Adsorption (PSA): The methane-enriched stream from the membrane unit undergoes further purification using PSA technology. This process utilizes adsorbent materials (e.g., activated carbon, zeolites) that preferentially adsorb CO2 and other remaining impurities like nitrogen (N2) and oxygen (O2) at high pressure. The gas stream flows through multiple beds of adsorbent. When one bed is saturated with impurities, the gas flow is switched to another bed, while the saturated bed is regenerated by reducing the pressure, releasing the adsorbed gases. This cyclical process allows for the continuous production of high-purity biomethane.

• High Methane Purity: Achieves >97% methane concentration, suitable for vehicle fuel and grid injection.
• Excellent Efficiency & Recovery: Optimized integration minimizes methane loss and maximizes product yield.
• Robust Pre-treatment: Effective removal of H2S, moisture, and other contaminants protects downstream equipment and ensures final product quality.
• Modular Design: Scalable systems adaptable to various feedstock volumes and client requirements.
• Automated Operation: PLC-based control systems for continuous, unattended operation and remote monitoring.

Our biogas refining systems can be classified based on:

• Feedstock Type: Primarily designed for biogas derived from food processing wastes, agricultural residues, and other organic materials.
• System Capacity: Ranging from small-scale on-site solutions for individual food producers to larger, centralized facilities processing waste from multiple sources.
• Purity Level: Systems tailored to achieve specific biomethane purity standards, including vehicle fuel grade (SAE J1616, ISO 15403) or for direct grid injection.

• Greenhouse Gas Reduction: Significantly lowers methane emissions (a potent GHG) from organic waste decomposition and displaces fossil fuels.
• Waste Valorization: Converts problematic food waste into valuable energy and resources.
• Improved Air Quality: Use of biomethane as vehicle fuel reduces particulate matter and other harmful emissions compared to diesel.
• Circular Economy Promotion: Closes the loop on organic waste, transforming it into renewable energy and soil enhancers (digestate).
• Enhanced Energy Security: Provides a locally sourced, renewable energy supply.

• Feasibility Studies & Site Assessment: Detailed analysis of feedstock availability, biogas potential, economic viability, and regulatory compliance.
• Custom System Design & Engineering: Tailored design of the integrated membrane-PSA biogas refining system based on specific client requirements and site conditions.
• Equipment Procurement & Manufacturing: Sourcing and/or manufacturing of high-quality, reliable system components.
• Installation & Commissioning: Professional installation, system integration, and start-up services to ensure optimal performance.
• Maintenance & Optimization Services: Scheduled maintenance programs and performance optimization to ensure long-term reliability and efficiency.
• High-Value Co-product Development Consultation: Exploring and advising on opportunities for utilizing captured CO2 and other potential byproducts.