Thermophilic anaerobic co-digestion of poultry litter and thin stillage

•Co-digestion of poultry litter and thin stillage in thermophilic CSTR.•Tested co-digestion limits by increasing levels of thin stillage as co-substrate.•40% and 60% thin stillage increased biogas and methane production.•Instability with 80% thin stillage co-substrate in a stable poultry litter dige...

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Bibliographic Details
Published in:Bioresource technology 2013-05, Vol.136, p.251-256
Main Authors: Sharma, Deepak, Espinosa-Solares, Teodoro, Huber, David H.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Anaerobic digestion
Anaerobiosis
Animal productions
Animals
Bioenergy
Biofuel production
Biofuels
Biological and medical sciences
Biological Oxygen Demand Analysis
Biological treatment of sewage sludges and wastes
Bioreactors - microbiology
Biotechnology
Biotechnology - methods
Crack opening displacement
Digesters
Energy
Environment and pollution
Feedstock
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Hydrogen-Ion Concentration
Industrial applications and implications. Economical aspects
Litter
Methane
Methane - metabolism
Poultry
Poultry waste
Stillage
Temperature
Thermophilic digestion
Thin stillage
Use of agricultural and forest wastes. Biomass use, bioconversion
Waste Products - analysis
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Summary:•Co-digestion of poultry litter and thin stillage in thermophilic CSTR.•Tested co-digestion limits by increasing levels of thin stillage as co-substrate.•40% and 60% thin stillage increased biogas and methane production.•Instability with 80% thin stillage co-substrate in a stable poultry litter digester. The purpose of this study was to test whether the performance of a thermophilic CSTR digester that has been stabilized on poultry litter will be enhanced or diminished by the addition of thin stillage as co-substrate. Replicate laboratory digesters, derived from a stable pilot-scale digester, were operated with increasing ratios (w/w) of thin stillage/poultry litter feedstock. After a period of adaptation to 20% and 40% thin stillage, digester performance showed increases in biogas, percent methane and COD removal, as well as a decrease in volatile acids. Peak performance occurred with 60% thin stillage. However, 80% thin stillage caused significant reduction of performance, including declines of methanogenic activity and COD removal. In conclusion, supplementing the thermophilic digestion of poultry litter with thin stillage improved the bioenergy (methane) output, but thin stillage became inhibitory at high concentrations.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2013.03.005