Anaerobic Digestion of Pig Slurry in Fixed-Bed and Expanded Granular Sludge Bed Reactors

Anaerobic digestion of animal manure is a potential bioenergy resource that avoids greenhouse gas emissions. However, the conventional approach is to use continuously stirred tank reactors (CSTRs) with hydraulic retention times (HRTs) of greater than 30 d. Reactors with biomass retention were invest...

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Bibliographic Details
Published in:Energies (Basel) 2022-06, Vol.15 (12), p.4414
Main Authors: Häner, Jurek, Weide, Tobias, Naßmacher, Alexander, Hernández Regalado, Roberto Eloy, Wetter, Christof, Brügging, Elmar
Format: Article
Language:English
Subjects:
Agricultural production
Anaerobic bacteria
Anaerobic digestion
Animal wastes
Biogas
Biomass
Breeding
Chemical oxygen demand
Chemical properties
Continuously stirred tank reactors
Control
Effluents
Emissions
expanded granular sludge bed reactor
Experiments
fixed-bed reactor
Greenhouse effect
Greenhouse gases
Industrial plant emissions
Load distribution
Loading rate
Manures
Methane
Methods
Pig manure
pig slurry
Raw materials
Reactors
Sewage sludge digestion
Sludge
Sludge bed
Sludge bed reactors
Sludge digestion
Slurries
Slurry
Stainless steel
Swine
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Summary:Anaerobic digestion of animal manure is a potential bioenergy resource that avoids greenhouse gas emissions. However, the conventional approach is to use continuously stirred tank reactors (CSTRs) with hydraulic retention times (HRTs) of greater than 30 d. Reactors with biomass retention were investigated in this study in order to increase the efficiency of the digestion process. Filtered pig slurry was used as a substrate in an expanded granular sludge bed (EGSB) reactor and fixed-bed (FB) reactor. The highest degradation efficiency (ηCOD) and methane yield (MY) relative to the chemical oxygen demand (COD) were observed at the minimum loading rates, with MY = 262 L/kgCOD and ηCOD = 73% for the FB reactor and MY = 292 L/kgCOD and ηCOD = 76% for the EGSB reactor. The highest daily methane production rate (MPR) was observed at the maximum loading rate, with MPR = 3.00 m3/m3/d at HRT = 2 d for the FB reactor and MPR = 2.16 m3/m3/d at HRT = 3 d for the EGSB reactor. For both reactors, a reduction in HRT was possible compared to conventionally driven CSTRs, with the EGSB reactor offering a higher methane yield and production rate at a shorter HRT.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15124414