Gas upgrading systems transform raw biogas or low-quality natural gas into pipeline-quality gas or vehicle fuel by removing contaminants and concentrating methane content. Upgrading enables renewable gas to substitute for fossil natural gas, supporting decarbonization and creating value from waste organic materials.

Upgrading technologies include pressure swing adsorption, membrane separation, amine scrubbing, and water scrubbing—each with advantages for specific feedstock characteristics and product specifications. System selection depends on biogas composition, required purity, scale, and economic factors.

Gas upgrading systems comprise multiple equipment items: pre-treatment for particulates and moisture, separation equipment for CO₂ removal, polishing for trace contaminants, compression for gas delivery, and controls for automated operation. Equipment must handle gas streams with variable composition while consistently delivering specification product.

Growing renewable natural gas markets drive upgrading system demand. These systems enable landfill gas, wastewater treatment biogas, and agricultural biogas to enter natural gas pipelines or supply vehicle fueling stations, converting waste to valuable renewable energy.