Webinar: Landfill Gas Treatment Technologies
On November 16, 2021, LMOP hosted a webinar with three speakers providing information about the treatment of landfill gas (LFG) for energy recovery projects. 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).
The presentations were followed by a question-and-answer session. The presentation slides are provided below in a PDF file as well as a recording of the webinar.
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 percent N2 (optimum range of 5-7 percent) in the raw LFG feed gas while achieving 96 percent 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 2019-2020 with an additional four installations planned for 2021-2022. The simplicity, high methane recovery and lower energy consumption of the Air Liquide NRU package can be beneficial to 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 percent active component, providing maximum concentration of active sites and H2S removal capacity. In a case study that Guild Associates presented during this webinar, 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 percent 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 percent and revenue increased.
Speakers:
Gregory Myrick | Technical Manager | Air Liquide Biogas Systems Engineering – Since joining Air Liquide in 2013, Greg has designed and assisted in the fabrication/construction of more than 30 membrane-based RNG upgrading systems. He was a key design authority in designing Air Liquide's Microbiogas (for H2S removal) and Nitrogen Rejection offerings. Greg received a Bachelor's in Chemical Engineering from the University of Delaware.
Andrew Zikeli | RNG Technical Manager | Air Liquide Biogas Solutions Americas – Andy serves as the Overall Design Authority for new biogas-to-RNG projects. He also supports Air Liquide's Over the Fence Biogas Development, Execution and Operations teams, with primary responsibility for validation and standardization of the technologies deployed. He has a Bachelor's in Physics and joined Air Liquide in 2015.
Gary Monks | Director of Product Development | Guild Associates – Gary has spent most of his career in the specialty inorganics industry, most recently managing a global adsorbent materials business at the Luxfer Group. He has a Ph.D. in Chemistry from the University of Liverpool and joined Guild Associates in 2020.
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