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Effects of CO2 enrichment on the anaerobic digestion of sewage sludge in continuously operated fermenters

The effect of CO2 enrichment in sewage sludge anaerobic digestion (AD) as a potential strategy to improve the biogas yield was assessed at increasing organic loading rates (OLR). Effects on process performance and resilience were evaluated in long-term continuous AD experiments at lab-scale. The spe...

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Bibliographic Details
Main Authors: Muntau, Meriam (Author) , Lebuhn, Michael (Author) , Polag, Daniela (Author) , Bajón-Fernández, Yadira (Author) , Koch, Konrad (Author)
Format: Article (Journal)
Language:English
Published: 15 April 2021
In: Bioresource technology
Year: 2021, Volume: 332, Pages: 1-10
ISSN:1873-2976
DOI:10.1016/j.biortech.2021.125147
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.biortech.2021.125147
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0960852421004867
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Author Notes:Meriam Muntau, Michael Lebuhn, Daniela Polag, Yadira Bajón-Fernández, Konrad Koch
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Summary:The effect of CO2 enrichment in sewage sludge anaerobic digestion (AD) as a potential strategy to improve the biogas yield was assessed at increasing organic loading rates (OLR). Effects on process performance and resilience were evaluated in long-term continuous AD experiments at lab-scale. The specific methane production (SMP) was sustainably enhanced in the test digester compared to a control at elevated OLRs, reaching an increase of 6 ± 12% on average at the highest OLR tested (4.0 kgVS/(m3·d)). The reduction of CO2 via homoacetogenesis, facilitating acetoclastic CH4 formation is proposed as the dominant conversion pathway. Results suggest that sufficient load of easily degradable substances is a prerequisite for intrinsic formation of the reduction equivalent H2 via acidogenesis. The enhanced resilience of the process under CO2-enriched conditions in response to acid accumulation further qualifies this approach as a viable option for improving AD performance by converting a waste stream into a valuable product.
Item Description:Im Text ist "2" tiefgestellt
Gesehen am 22.06.2021
Physical Description:Online Resource
ISSN:1873-2976
DOI:10.1016/j.biortech.2021.125147

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