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Biogas Production from Concentrated Municipal Sewage by Forward Osmosis, Micro and Ultrafiltration

Author

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  • Juan Carlos Ortega-Bravo

    (Centro de Gestión y Tecnologías del Agua, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile
    Chemical Engineering Department, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile)

  • Javier Pavez

    (Chemical Engineering Department, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile)

  • Víctor Hidalgo

    (Chemical Engineering Department, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile)

  • Isaac Reyes-Caniupán

    (Chemical Engineering Department, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile)

  • Álvaro Torres-Aravena

    (Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso 2362803, Chile)

  • David Jeison

    (Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso 2362803, Chile)

Abstract

Direct application of anaerobic digestion to sewage treatment is normally only possible under tropical weather conditions. This is the result of its diluted nature and temperatures far from those suitable for anaerobic conversion of organic matter. Then, direct application of anaerobic treatment to sewage would require changing temperature, concentration, or both. Modification of sewage temperature would require much more energy than contained in the organic matter. Then, the feasible alternative seems to be the application of a pre-concentration step that may be accomplished by membrane filtration. This research studied the pre-concentration of municipal sewage as a potential strategy to enable the direct anaerobic conversion of organic matter. Three different membrane processes were tested: microfiltration, ultrafiltration and forward osmosis. The methane potential of the concentrates was determined. Results show that biogas production from the FO-concentrate was higher, most likely because of a higher rejection. However, salt increase due to rejection and reverse flux of ions from the draw solution may affect anaerobic digestion performance.

Suggested Citation

  • Juan Carlos Ortega-Bravo & Javier Pavez & Víctor Hidalgo & Isaac Reyes-Caniupán & Álvaro Torres-Aravena & David Jeison, 2022. "Biogas Production from Concentrated Municipal Sewage by Forward Osmosis, Micro and Ultrafiltration," Sustainability, MDPI, vol. 14(5), pages 1-11, February.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:5:p:2629-:d:757616
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    References listed on IDEAS

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    1. Agnieszka Urbanowska & Małgorzata Kabsch-Korbutowicz, 2021. "The Use of Flat Ceramic Membranes for Purification of the Liquid Fraction of the Digestate from Municipal Waste Biogas Plants," Energies, MDPI, vol. 14(13), pages 1-12, July.
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