Semi-continuous anaerobic co-digestion of sugar beet byproduct and pig manure: Effect of the organic loading rate (OLR) on process performance

•The anaerobic co-digestion of sugar beet byproducts with pig manure is feasible.•The highest methane productivity was obtained at hydraulic retention time of 6days.•The organic loading rate maximizing the methane production was 11.2gVS/Lreactord.•The hydraulic retention time of 5days leads to volat...

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Bibliographic Details
Published in:Bioresource technology 2015-10, Vol.194, p.283-290
Main Authors: Aboudi, Kaoutar, Álvarez-Gallego, Carlos José, Romero-García, Luis Isidoro
Format: Article
Language:English
Subjects:
Anaerobiosis
Animals
Beta vulgaris - chemistry
Biofuels - analysis
Bioreactors
Biotechnology - methods
Carbon - analysis
Co-digestion
Fatty Acids, Volatile - analysis
Hydraulic retention time
Hydrogen-Ion Concentration
Manure - analysis
Methane - metabolism
Methane production
Organic Chemicals - analysis
Organic loading rate
Semi-continuous tank reactor
Sus scrofa
Volatilization
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Summary:•The anaerobic co-digestion of sugar beet byproducts with pig manure is feasible.•The highest methane productivity was obtained at hydraulic retention time of 6days.•The organic loading rate maximizing the methane production was 11.2gVS/Lreactord.•The hydraulic retention time of 5days leads to volatile fatty acids accumulation.•System recovery is possible by increasing hydraulic retention time from 5 to 6days. Anaerobic co-digestion of dried pellet of exhausted sugar beet cossettes (ESBC-DP) with pig manure (PM) was investigated in a semi-continuous stirred tank reactor (SSTR) under mesophilic conditions. Seven hydraulic retention times (HRT) from 20 to 5days were tested with the aim to evaluate the methane productivities and volatile solids (VS) removal. The corresponding organic loading rates (OLR) ranged from 4.2 to 12.8gVS/Lreactord. The findings revealed that highest system efficiency was achieved at an OLR of 11.2gVS/Lreactord (6days-HRT) with a methane production rate (MPR) and volatile solids (VS) reduction of 2.91 LCH4/Lreactord and 57.5%, respectively. The HRT of 5days was found critical for the studied process, which leads to volatile fatty acids (VFA) accumulation and sharp drop in pH. However, the increase of HRT permits the recovery of system.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2015.07.031