Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria
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 ca...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/20/6618 |
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| author | Joseph Tauber Andreas Ramsbacher Karl Svardal Jörg Krampe |
| author_facet | Joseph Tauber Andreas Ramsbacher Karl Svardal Jörg Krampe |
| author_sort | Joseph Tauber |
| collection | DOAJ |
| description | 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<sup>−1</sup>) of Austria’s yearly renewable electricity production (7470 GWh·y<sup>−1</sup>) can be transformed into biomethane via BM in municipal digesters. |
| first_indexed | 2024-03-10T06:35:41Z |
| format | Article |
| id | doaj.art-7108cadaf6354ac29f9f7eaf45e812ca |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T06:35:41Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7108cadaf6354ac29f9f7eaf45e812ca2023-11-22T18:06:02ZengMDPI AGEnergies1996-10732021-10-011420661810.3390/en14206618Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in AustriaJoseph Tauber0Andreas Ramsbacher1Karl Svardal2Jörg Krampe3Institute for Water Quality and Resource Management, TU Wien, Karlsplatz 13/2261, 1040 Vienna, AustriaInstitute for Water Quality and Resource Management, TU Wien, Karlsplatz 13/2261, 1040 Vienna, AustriaInstitute for Water Quality and Resource Management, TU Wien, Karlsplatz 13/2261, 1040 Vienna, AustriaInstitute for Water Quality and Resource Management, TU Wien, Karlsplatz 13/2261, 1040 Vienna, AustriaBiological 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<sup>−1</sup>) of Austria’s yearly renewable electricity production (7470 GWh·y<sup>−1</sup>) can be transformed into biomethane via BM in municipal digesters.https://www.mdpi.com/1996-1073/14/20/6618anaerobic digestionbiological methanationcarbon dioxideenergy conversionhydrogenmethane |
| spellingShingle | Joseph Tauber Andreas Ramsbacher Karl Svardal Jörg Krampe Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria Energies anaerobic digestion biological methanation carbon dioxide energy conversion hydrogen methane |
| title | Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria |
| title_full | Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria |
| title_fullStr | Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria |
| title_full_unstemmed | Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria |
| title_short | Energetic Potential for Biological Methanation in Anaerobic Sewage Sludge Digesters in Austria |
| title_sort | energetic potential for biological methanation in anaerobic sewage sludge digesters in austria |
| topic | anaerobic digestion biological methanation carbon dioxide energy conversion hydrogen methane |
| url | https://www.mdpi.com/1996-1073/14/20/6618 |
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