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Landfill Gas Treatment Technologies
Removing impurities from LFG can be costly and complicated. Learn how two LMOP Partners are improving LFG treatment by making it easier to remove nitrogen (N2) and hydrogen sulfide (H2S).

Designing an LFG-to-renewable natural gas (RNG) upgrading plant involves numerous site-specific variables, particularly raw LFG flow and composition. An elevated N2 concentration can present challenges for meeting natural gas pipeline specifications and require enhanced management of the LFG collection or specific treatment to remove N2. Air Liquide developed a Nitrogen Rejection Unit (NRU) system to effectively process feed N2 concentrations up to 12% N2 (optimum range of 5-7%) in the raw feed gas while achieving 96% methane recovery in the product RNG. Upgraded biogas is compressed, cooled and then treated through a cascaded 3-stage process. Other than the feed compression and a modulating quality control valve, the system does not have any moving parts which results in simple operation. Air Liquide installed this membrane NRU at two sites in 2019-20 with four installations planned for 2021-22. The simplicity, high methane recovery and lower energy consumption of this NRU package can benefit landfills that need to address N2 concentrations.

Mixed metal oxy-hydroxide (MMO) is a new, field-proven dry media technology from Guild Associates for the removal of H2S from LFG. Unlike conventional dry media types, which contain both active and inactive components, MMO contains 100% active component, providing maximum concentration of active sites and H2S removal capacity. In a case study that Guild Associates will present, MMO media was used to replace a conventional media type at a landfill in Texas. The enhanced media efficiency allowed the landfill to process 15% more gas (up to 6,500 standard cubic feet per minute) and extended the media change-out interval by a factor of five, from three to 15 weeks. As a result, operational costs were reduced by 80% and revenue increased.

Nov 16, 2021 02:00 PM in Eastern Time (US and Canada)

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