Biogas Desulphurization
Gas Upgrading System
Cascade LF is our next-generation landfill gas upgrading system, designed for higher performance at lower cost, delivering up to 99.5% methane recovery in the nitrogen-removal stage. In landfill gas, nitrogen needs to be removed, which is difficult to do without also losing methane. Loss of methane means loss of revenue and profit from RNG-producing assets.
Greenlane set out to solve this problem with relentless focus on preserving every methane molecule, while keeping costs low. Every 1% improvement in methane recovery translates into a 1% increase in project revenue, which drops directly to the bottom line.
Cascade LF's patent-pending process starts with the removal of H₂S, VOCs and siloxanes, followed by a first upgrading step using high O₂-permeable membrane technology to effectively eliminate CO₂ and most of the O₂, avoiding the need for supplemental O₂ removal such as a De-Ox. The final upgrading step utilizes Greenlane's proprietary Linear NRU, based on equilibrium PSA principles, to reduce N₂ and O₂ to the level required for product-gas compliance through a simplified, stepwise gas-enrichment process using fewer, smaller adsorption beds. Other innovations include a patent-pending lead-lag bed configuration and a novel precision control method based on the adsorption mechanism itself. The outcome is lower CAPEX and OPEX, higher methane recovery, and proven technology elements integrated without adding new technology risk. Optimal results are achieved when it is paired with automated wellfield controls to maximize CH₄ flow from the landfill while limiting N₂.
For landfill gas with higher N₂ levels (up to 16%), Greenlane's Linear+ NRU adds a purification step and bigger adsorption beds while preserving the same high methane recovery and innovation as the Linear NRU.
With 24/7 expert support, remote monitoring, and flexible service options, Greenlane's Cascade LF delivers high performance and reliability for landfill gas projects, backed by decades of industry experience. Contact us to size your system.
Every biogas project requires hydrogen sulfide (H₂S) removal. Cascade H₂S is our low-cost, reliable, and regenerative bulk H₂S removal solution. It has similar CAPEX to a sacrificial media approach, but with only 15-30% of the OPEX. For existing projects using sacrificial media, Cascade H₂S can pay back in < 1 year.
It is oxygen-free. The process neither requires the addition of oxygen nor adds it to the treated gas, does not rely on sensitive biology, and avoids non-compliance with stringent O₂ pipeline injection specifications.
The raw, untreated biogas enters a scrubbing tower at low pressure, where it flows countercurrent to a regenerative chemical solution. Treated gas exits through the top of the scrubber at approximately 100 ppm H₂S. The sulfur-rich liquid solution is regenerated in a separate oxidation tank, after which it is transferred to a sulfur separator to remove the elemental sulfur solids, which can be spread on fields as fertilizer. Clean, regenerated solution returns to the scrubbing tower in a continuous process. An optional polishing step further treats the gas to meet pipeline specifications of 4 ppm or less.
Cascade H₂S is easy to install and operate. It eliminates many of the operational issues and costs that come with traditional biological scrubbing and media-based H₂S removal systems.
Contact us for more details and a proposal for your application.
Cascade MS is Greenlane’s membrane separation biogas upgrading solution, designed to provide the best possible combination of price and performance specifically for large biogas flow projects.
Cascade MS provides high-capacity upgrading with low capital cost, efficiently treating high biogas flows from a wide range of anaerobic digestion feedstocks while minimizing capital investment. High-selectivity membrane technology ensures consistent CO₂ separation and oxygen removal to meet or exceed pipeline specifications, resulting in reliable production of pipeline-quality RNG. Cascade MS can be configured with either passive or regenerative pretreatment to remove low to high levels of H₂S, VOCs, and siloxanes.
In operation, biogas is pretreated, compressed, filtered and conditioned for upgrading before it flows through membrane cartridges that remove CO₂ and O₂ resulting in a continuous stream of high-value renewable natural gas that exceeds pipeline quality requirements.
Please contact us to review your requirements.
Cascade H₂O is Greenlane’s water wash biogas-upgrading solution. Water wash technology is among the most deployed biogas upgrading technologies in the world, using counter-flow water to scrub away biogas impurities without the need for chemicals or heat. Cascade H₂O upgrades biogas from all types of feedstocks, with high tolerance to impurities, and meets pipeline quality requirements with up to 99% methane recovery.
Cascade H₂O removes CO₂, H₂S, and water-soluble VOCs and siloxanes in a single step without the need for pretreatment. For projects with high H₂S levels, pairing with Greenlane’s Cascade H₂S product results in low capital and operating costs. If pre-treatment is used for higher levels of impurities and breakthrough occurs, Cascade H₂O will not be permanently damaged by high levels of impurities such as H₂S, VOCs, siloxanes, and oil.
Cascade H₂O operates in a closed loop to limit energy consumption, provides high methane recovery with high uptime, has no expensive overhaul of the upgrading media (it’s only water), and is highly efficient at CO₂ removal, especially when impurities also need to be removed.
Contact us to review your requirements.
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Greenlane Renewables
110 - 3605 Gilmore Way
Burnaby BC
V5G 4X5, Canada.
IR@greenlanerenewables.com
