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Thermophilic anaerobic co-digestion of poultry litter and thin stillage

Thermophilic anaerobic co-digestion of poultry litter and thin stillage

Bioresource Technology 136: 251-256

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.

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Accession: 056556809

Download citation: RISBibTeXText

PMID: 23567688

DOI: 10.1016/j.biortech.2013.03.005

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