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Integration of a water scrubbing technique and two-stage pressurized anaerobic digestion in one process

Lemmer, Andreas; Chen, Yuling; Wonneberger, Anna-Maria; Graf, Frank; Reimert, Rainer

Abstract:
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 perce ... mehr


Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
DVGW - Technologiezentrum Wasser (TZW)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator DOI: 10.3390/en8032048
ISSN: 1996-1073
URN: urn:nbn:de:swb:90-596854
KITopen ID: 1000059685
Erschienen in Energies
Band 8
Heft 3
Seiten 2048-2065
Lizenz CC BY 4.0: Creative Commons Namensnennung 4.0 International
Schlagworte anaerobic digestion, pressurized fermentation, methane enrichment, biogas upgrading, biomethane
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