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Technology

Full-system solutions utilizing three leading biogas upgrading technologies

Greenlane’s upgrading systems are marketed and sold under the Greenlane Biogas™ brand. Biogas upgrading systems cleanse the impurities in biogas and separate the carbon dioxide from the biomethane to create a clean, high-purity low-carbon fuel: renewable natural gas (RNG).

Greenlane is the only biogas upgrading company to offer multiple core technologies: water wash, pressure swing adsorption (PSA), and membrane separation.

Reliable Solutions by Project Type

Solutions by project type chart

Greenlane manages the entire project life cycle from design and procurement through to on-site installation, commissioning, and aftercare. Post-installation, Greenlane provides aftercare service including 24/7 technical support and remote monitoring, as well as maintenance and spare parts.

WATER WASH

Best for larger projects demanding high biomethane recovery and robust, reliable operation

A biogas treatment plant Greenlane leads the field in water-wash (or water-scrubbing) technology, the most deployed upgrading technology in the world. Water-wash systems use counter-flow water to scrub away impurities, without the need for chemicals or heat.  

The water wash process is simple and requires no upstream treatment. The raw untreated biogas is compressed, and then simply flows upwards through a cascade of water. The carbon dioxide, hydrogen sulphide, volatile organic compounds, and siloxanes dissolve into the water while the methane does not, separating the two. The methane is then dehydrated providing pure, dry RNG. The water is cleaned of the impurities by flowing air through it and reused in a closed loop.  

The Greenlane Biogas™ product line for water-wash systems comprises five models designed to meet a wide range of flow-rate requirements. All the models are of a standard modular design with a compact footprint, able to process different raw biogas flow. Where larger capacity is required, we provide multiple systems in parallel.

PRESSURE SWING ADSORPTION

Best for complex feedstock

A biogas treatment plant Pressure Swing Adsorption (PSA) is an effective method of separating specific gases from a complex mixture of gases, like those generated in landfills. The PSA process involves several steps to purify the biogas and separate the methane from the carbon dioxide.

Hydrogen sulfide is removed first, and then the biogas is chilled and dehydrated. An adsorbent media then traps the carbon dioxide, nitrogen, oxygen, and any remaining moisture, allowing the methane to pass through as clean and dry RNG. The media is regenerated and reused by releasing the pressure and putting it under a vacuum which causes the media to release the trapped contaminants.

While PSA is the only technology that removes nitrogen, high nitrogen levels can reduce methane recovery rates. Because of this, the best option in high Nitrogen applications, or those with especially tough specification is often to pair a PSA with another technology such as water wash - a combination that is only available through Greenlane.

MEMBRANE SEPARATION

Best for smaller projects and reduced upfront expenditure

A biogas treatment plant Membrane separation technology uses tubular porous membranes to separate the carbon dioxide from the methane in a process called permeation. As the gas passes through the tubes, the smaller carbon dioxide molecules pass through the walls of the membranes while the larger methane molecules do not.

Membrane separation is often best suited for small to medium sized projects where initial capital expenditure is considered more important than long-term life cycle costs.