LAPSE:2019.1451
Published Article
LAPSE:2019.1451
Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant
Frauke P. C. Müller, Gerd-Christian Maack, Wolfgang Buescher
December 10, 2019
Biogas plants are the most complex systems and are heavily studied in the field of renewable energy. A biogas system is mainly influenced by biological and technical parameters that strongly interact with each other. One recommended practice when operating a biogas plant is the recirculation of the substrate from the second fermenter into the first fermenter, which extends the recirculation amount (RA) and, in turn, the recirculation rate (RR). This technique should be applied to support and secure the biogas process. In this investigation, the RA was varied, starting with the recommended “best practice” of 10.0 m³/d (RR 40%). Every ten days, the RA was reduced in steps of 1.5 m³/d, with 5.5 m³/d (RR 27%) being the final value. The basic question to be addressed concerns to what extent the RR influences the methane yield and thereby influence the efficiency of a manure-based biogas plant in practice. Diverting the “best practice” to a RR of 27% stabilised the fermentation process and lead to significantly higher methane yields with smaller standard deviations. In addition, with a reduced RR, the standard optimal acid concentration within the biogas substrate was approximately reached.
Keywords
biogas, hydraulic retention time (HRT), methane output, organic loading rate (OLR), recirculation
Subject
Suggested Citation
Müller FPC, Maack GC, Buescher W. Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant. (2019). LAPSE:2019.1451
Author Affiliations
Müller FPC: Institute of Agricultural Engineering, Livestock Technology, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 5, 53115 Bonn, Germany
Maack GC: Institute of Agricultural Engineering, Livestock Technology, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 5, 53115 Bonn, Germany
Buescher W: Institute of Agricultural Engineering, Livestock Technology, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 5, 53115 Bonn, Germany
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Journal Name
Energies
Volume
10
Issue
3
Article Number
E325
Year
2017
Publication Date
2017-03-08
Published Version
ISSN
1996-1073
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Original Submission
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PII: en10030325, Publication Type: Journal Article
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LAPSE:2019.1451
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doi:10.3390/en10030325
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Dec 10, 2019
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CC BY 4.0
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Dec 10, 2019
 
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Calvin Tsay
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