Toward gas-phase controlled mass transfer in micro-porous membrane contactors for recovery and concentration of dissolved methane in the gas phase

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dc.contributor.authorMcLeod, Andrew J.
dc.contributor.authorJefferson, Bruce
dc.contributor.authorMcAdam, Ewan J.
dc.date.accessioned2016-06-28T12:46:05Z
dc.date.available2016-06-28T12:46:05Z
dc.date.issued2016-03-18
dc.description.abstractA micro-porous hollow fibre membrane contactor (HFMC) operated in sweep-gas mode has been studied to enable the recovery of dissolved methane from water in concentrated form. At high sweep-gas flow rates, up to 97% dissolved methane removal efficiency is achievable which is sufficient to achieve carbon neutrality (around 88%). An increase in methane composition of the recovered sweep-gas was achievable through two primary mechanisms: (i) an increase in liquid velocity which improved dissolved methane mass transfer into the gas phase; and (ii) a reduction in gas flow which lowered dilution from the receiving gas phase. It was posited that further refinement of the methane content was provided through counter-diffusion of the nitrogen sweep-gas into the liquid phase. Within the boundary conditions studied, the methane composition of the recovered gas phase exceeded the threshold for use in micro-turbines for electricity production. However, reducing the gas-to-liquid ratio to enhance gas phase methane purity introduced gas-phase controlled mass transfer which constrained removal efficiency. Whilst this reduction in removal efficiency can be compensated for by extending path length (i.e. more than one module in series), it is suggested that the gas-phase controlled conditions encountered were also a product of poor shell-side dispersion rather than an approach toward the limiting theoretical gas-to-liquid ratio. This implies that further optimisation can be ascertained through improved membrane contactor design. Importantly, this study demonstrates that micro-porous hollow fibre membrane contactors provide a compact process for recovery of dissolved methane in sufficient concentration for re-use.en_UK
dc.identifier.citationAndrew McLeod, Bruce Jefferson, Ewan J. McAdam, Toward gas-phase controlled mass transfer in micro-porous membrane contactors for recovery and concentration of dissolved methane in the gas phase, Journal of Membrane Science, Volume 510, 15 July 2016, pp466-471en_UK
dc.identifier.cris3900982
dc.identifier.issn0376-7388
dc.identifier.urihttp://dx.doi.org/10.1016/j.memsci.2016.03.030
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/10037
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International (CC BY 4.0) You are free to: Share — copy and redistribute the material in any medium or format, Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.subjectDissolved methane recoveryen_UK
dc.subjectDegasen_UK
dc.subjectDegassingen_UK
dc.subjectAnaerobicen_UK
dc.subjectLandfill leachateen_UK
dc.titleToward gas-phase controlled mass transfer in micro-porous membrane contactors for recovery and concentration of dissolved methane in the gas phaseen_UK
dc.typeArticleen_UK

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