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Article

Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria

Institute for Water Quality and Resource Management, TU Wien, Karlsplatz 13/2261, 1040 Vienna, Austria
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Academic Editors: Heidrun Steinmetz, Michael Schafer and Jürgen Wiese
Energies 2021, 14(20), 6618; https://doi.org/10.3390/en14206618
Received: 16 September 2021 / Revised: 4 October 2021 / Accepted: 9 October 2021 / Published: 13 October 2021
(This article belongs to the Special Issue Contributions of WWTPs to the Clean Energy Transition)
Biological methanation as a method of sector coupling between electric and gas grids is expected to be an integral part of the green energy change. Wastewater treatment plants (WWTPs) involving anaerobic digestion (AD) allow existing infrastructure to operate as energy conversion plants, to close carbon cycles and to generate long-term storable energy in the form of biomethane. Therefore, municipal raw sludge and additional organic residuals (co-substrates) are converted into biogas. Hydrogen is added to convert the carbon dioxide in the biogas into methane via biological methanation (BM). In this study, the energy amount that is convertible via BM in municipal digesters in Austria was calculated. The amount of energy, which can be transformed from electric surplus energy into biomethane, was assessed. Operational data from lab-scale digesters were combined with data from 28 Austrian full-scale wastewater treatment plants with AD. They represent 9.2 Mio population equivalents (PE), or 68% of Austria’s municipal AD capacity for WWTPs > 50,000 PE (in sum, 13.6 Mio PE). Energy flows for BM including water electrolysis and anaerobic digestion were created on a countrywide basis. It was found that 2.9–4.4% (220–327 GWh·y−1) of Austria’s yearly renewable electricity production (7470 GWh·y−1) can be transformed into biomethane via BM in municipal digesters. View Full-Text
Keywords: anaerobic digestion; biological methanation; carbon dioxide; energy conversion; hydrogen; methane; renewable energy storage anaerobic digestion; biological methanation; carbon dioxide; energy conversion; hydrogen; methane; renewable energy storage
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MDPI and ACS Style

Tauber, J.; Ramsbacher, A.; Svardal, K.; Krampe, J. Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria. Energies 2021, 14, 6618. https://doi.org/10.3390/en14206618

AMA Style

Tauber J, Ramsbacher A, Svardal K, Krampe J. Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria. Energies. 2021; 14(20):6618. https://doi.org/10.3390/en14206618

Chicago/Turabian Style

Tauber, Joseph, Andreas Ramsbacher, Karl Svardal, and Jörg Krampe. 2021. "Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria" Energies 14, no. 20: 6618. https://doi.org/10.3390/en14206618

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