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% methane recovery per nitrogen-removal stage. In landfill gas, O₂ and N₂ need to be removed, which is difficult to do without also losing methane. Loss of methane means loss of revenue and profit from landfill gas-derived 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 operating profit.
Cascade LF's patent-pending process starts with the removal of H₂S, VOCs and siloxanes, followed by a first upgrading step to effectively eliminate CO₂ and most of the O₂. The final upgrading step utilizes Greenlane's proprietary Linear Nitrogen Rejection Unit (NRU), based on equilibrium PSA principles, to reduce N₂ to the level required for product-gas compliance through a simplified, stepwise gas-enrichment process using fewer, smaller adsorption beds. The result is lower CAPEX and OPEX and higher methane recovery.
For higher N₂ levels, the modular design adds adsorption beds and compression in a staged configuration while maintaining the linear approach and high recovery performance. Pairing Cascade LF with landfill wellfield real-time monitoring and controls to limit N₂ and maximize CH₄ flow from the landfill produces optimal results.
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.
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, relies on no sensitive biology, and avoids non-compliance with stringent O₂ pipeline injection specifications.
Every biogas project requires hydrogen sulfide (H₂S) removal.
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, then flows through membrane cartridges that remove carbon dioxide and oxygen, resulting in high-purity methane product gas. Some of the processed gas is recycled back to the compressor inlet to maximize methane recovery, producing a continuous stream of high-value renewable natural gas that meets 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 hydrogen sulfide, volatile organic compounds, 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 carbon dioxide 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
