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Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant
- Source :
- Energies, Vol 10, Iss 3, p 325 (2017), Energies; Volume 10; Issue 3; Pages: 325
- Publication Year :
- 2017
- Publisher :
- MDPI AG, 2017.
-
Abstract
- 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.
- Subjects :
- Control and Optimization
020209 energy
Liquid manure
Energy Engineering and Power Technology
Industrial fermentation
02 engineering and technology
010501 environmental sciences
01 natural sciences
lcsh:Technology
Methane
chemistry.chemical_compound
Biogas
recirculation
0202 electrical engineering, electronic engineering, information engineering
biogas
methane output
Electrical and Electronic Engineering
Engineering (miscellaneous)
0105 earth and related environmental sciences
Renewable Energy, Sustainability and the Environment
business.industry
lcsh:T
Environmental engineering
Substrate (chemistry)
organic loading rate (OLR)
Manure
hydraulic retention time (HRT)
Renewable energy
chemistry
Environmental science
Fermentation
business
Energy (miscellaneous)
Subjects
Details
- Language :
- English
- ISSN :
- 19961073
- Volume :
- 10
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Energies
- Accession number :
- edsair.doi.dedup.....9d8993a5dbadbdecb2ed59020b34648d