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Membrane-based technologies for biogas upgrading: a review

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Abstract

Global warming caused by increasing CO2 atmospheric levels is calling for sustainable fuels. For instance, biomethane produced by biogas upgrading is a promising source of green energy. Technologies to upgrade biogas include chemical absorption, water scrubbing, physical absorption, adsorption, cryogenic separation and membrane separation. Historically, water scrubbing was preferred because of the simplicity of this operation. However, during the last decade, membrane separation stood out due to its promising economic viability with investment costs of 3500–7500 €/(m3/h) and operational costs of 7.5–12.5 €/(m3/h). Here we review biogas upgrading by membrane separation. We discuss gas permeation, membrane materials, membrane modules, process configurations and commercial biogas plants. Polymeric materials appear as most adequate for membranes aimed to upgrade biogas. Concerning membrane modules, hollow fibers are the cheapest (1.5–9 €/m2). Multistage configurations provide high methane recovery, of 99%, and purity, of 95–99%, compared to single-stage configurations.

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Fig. 1

Adapted from Baena-Moreno et al. (2019a) and Global Monitoring Laboratory (2020)

Fig. 2
Fig. 3

Adapted from European Biogas Association (2020)

Fig. 4

Adapted from Angelidaki et al. (2018)

Fig. 5
Fig. 6

Adapted from Scholz et al (2013)

Fig. 7

Adapted from Chen et al. (2015)

Fig. 8

adapted from Zeman and Zydney (2017); b Second membrane module, a retentate recirculation and two compressors, adapted from Zhao et al. (2010); c Without recirculation of the second membrane module retentate, adapted from Bailón Allegue and Hinge (2014); d With sweep gas use and a second membrane module with permeate recirculation, adapted from Hasan et al. (2012)

Fig. 9

Adapted from Chen et al. (2015)

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Acknowledgements

This work was supported by University of Seville through V PPIT-US. This work was also partially funded by the CO2Chem UK through the EPSRC Grant (No. EP/R512904/1) and the Royal Society Research Grant (No. RSGR1180353).

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Correspondence to Francisco M. Baena-Moreno.

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Baena-Moreno, F.M., le Saché, E., Pastor-Pérez, L. et al. Membrane-based technologies for biogas upgrading: a review. Environ Chem Lett 18, 1649–1658 (2020). https://doi.org/10.1007/s10311-020-01036-3

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  • DOI: https://doi.org/10.1007/s10311-020-01036-3

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