Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process
Two-stage pressurized anaerobic digestion is a promising technology. This technology integrates in one process biogas production with upgrading and pressure boosting for grid injection. To investigate whether the efficiency of this novel system could be further increased, a water scrubbing system wa...
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MDPI AG
2015-03-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/8/3/2048 |
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| author | Andreas Lemmer Yuling Chen Anna-Maria Wonneberger Frank Graf Rainer Reimert |
| author_facet | Andreas Lemmer Yuling Chen Anna-Maria Wonneberger Frank Graf Rainer Reimert |
| author_sort | Andreas Lemmer |
| collection | DOAJ |
| description | Two-stage pressurized anaerobic digestion is a promising technology. This technology integrates in one process biogas production with upgrading and pressure boosting for grid injection. To investigate whether the efficiency of this novel system could be further increased, a water scrubbing system was integrated into the methanogensis step. Therefore, six leach-bed reactors were used for hydrolysis/acidification and a 30-L pressurized anaerobic filter operated at 9 bar was adopted for acetogenesis/methanogenesis. The fermentation liquid of the pressurized anaerobic filter was circulated periodically via a flash tank, operating at atmospheric pressure. Due to the pressure drop, part of dissolved carbon dioxide was released from the liquid phase into the flash tank. The depressurized fermentation liquid was then recycled to the pressurized reactor. Three different flow rates (0 L·day−1, 20 L·day−1 and 40 L·day−1) were tested with three repetitions. As the daily recycled flashed liquid flow was increased from 0 to 40 L, six times as much as the daily feeding, the methane content in the biogas increased from 75 molar percent (mol%) to 87 mol%. The pH value of the substrate in the methane reactor rose simultaneously from 6.5 to 6.7. The experimental data were verified by calculation. |
| first_indexed | 2024-04-12T19:30:22Z |
| format | Article |
| id | doaj.art-31d4a3244ffe461e88757876da1da1af |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-12T19:30:22Z |
| publishDate | 2015-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-31d4a3244ffe461e88757876da1da1af2022-12-22T03:19:21ZengMDPI AGEnergies1996-10732015-03-01832048206510.3390/en8032048en8032048Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One ProcessAndreas Lemmer0Yuling Chen1Anna-Maria Wonneberger2Frank Graf3Rainer Reimert4State Institute of Agricultural Engineering and Bioenergy, University Hohenheim, Garbenstraße 9, D-70599 Stuttgart, GermanyState Institute of Agricultural Engineering and Bioenergy, University Hohenheim, Garbenstraße 9, D-70599 Stuttgart, GermanyDVGW–Research Center at the Engler-Bunte-Institut, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, D-76131 Karlsruhe, GermanyDVGW–Research Center at the Engler-Bunte-Institut, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, D-76131 Karlsruhe, GermanyEngler-Bunte-Institut, Division Chemical Energy Carriers and Fuel Technology, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, D-76131 Karlsruhe, GermanyTwo-stage pressurized anaerobic digestion is a promising technology. This technology integrates in one process biogas production with upgrading and pressure boosting for grid injection. To investigate whether the efficiency of this novel system could be further increased, a water scrubbing system was integrated into the methanogensis step. Therefore, six leach-bed reactors were used for hydrolysis/acidification and a 30-L pressurized anaerobic filter operated at 9 bar was adopted for acetogenesis/methanogenesis. The fermentation liquid of the pressurized anaerobic filter was circulated periodically via a flash tank, operating at atmospheric pressure. Due to the pressure drop, part of dissolved carbon dioxide was released from the liquid phase into the flash tank. The depressurized fermentation liquid was then recycled to the pressurized reactor. Three different flow rates (0 L·day−1, 20 L·day−1 and 40 L·day−1) were tested with three repetitions. As the daily recycled flashed liquid flow was increased from 0 to 40 L, six times as much as the daily feeding, the methane content in the biogas increased from 75 molar percent (mol%) to 87 mol%. The pH value of the substrate in the methane reactor rose simultaneously from 6.5 to 6.7. The experimental data were verified by calculation.http://www.mdpi.com/1996-1073/8/3/2048anaerobic digestionpressurized fermentationmethane enrichmentbiogas upgradingbiomethane |
| spellingShingle | Andreas Lemmer Yuling Chen Anna-Maria Wonneberger Frank Graf Rainer Reimert Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process Energies anaerobic digestion pressurized fermentation methane enrichment biogas upgrading biomethane |
| title | Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process |
| title_full | Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process |
| title_fullStr | Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process |
| title_full_unstemmed | Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process |
| title_short | Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process |
| title_sort | integration of a water scrubbing technique and two stage pressurized anaerobic digestion in one process |
| topic | anaerobic digestion pressurized fermentation methane enrichment biogas upgrading biomethane |
| url | http://www.mdpi.com/1996-1073/8/3/2048 |
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