BEST FOR LARGER PROJECTS DEMANDING HIGH METHANE RECOVERY AND ROBUST RELIABLE OPERATION
Greenlane leads the field in water wash (or water-scrubbing) technology, a safe, reliable, and proven technology, using no chemicals or heat. It is the most efficient upgrading process for medium, large, and ultra-large projects. No pre-drying or pre-cleaning of the raw biogas is required and high methane recovery rates of 99% are inherently maintained thus making water wash the most robust and popular upgrading technology.
All water wash models are of standard modular design with a compact footprint. Each operates successfully within a wide biogas flow-rate band. Greenlane has the largest range of model sizes on the market, with standard plant models from 100 to 5,000 Nm3/hr of raw biogas flow. Larger capacities are achieved with multiple systems installed in parallel.
PRESSURE SWING ADSORPTION
BEST FOR COMPLEX FEEDSTOCK
Pressure Swing Adsorption (PSA) is an effective method of gas separation, particularly where a complex mixture of gases are generated from the feedstock, such as in landfill sites. Under pressure, different gases are attracted to different solid surfaces, or "adsorbed."
Following initial desulphurisation, PSA processes can be used to separate the mixed gases. Changing the pressure allows oxygen, nitrogen, and carbon dioxide to be trapped by the adsorbents. The PSA system is also able to recover CO2 as a by-product.
Greenlane’s PSA system efficiently regenerates the adsorbing agents using little power. In certain applications requiring combinations of technologies, PSA integrates effectively with water wash systems.
BEST FOR SMALLER PROJECTS FOR REDUCED UPFRONT EXPENDITURE
Membrane technology uses straw-like fibers to separate carbon dioxide from methane using the principle of permeation. This process delivers a high methane yield. Membrane designs are best suited to small- to medium-sized projects where up-front expenditure is considered most important, compared to long-term lifecycle costs.