Effect of cobalt supplementation and fractionation on the biological response in the biomethanization of Olive Mill Solid Waste

•Biomethanization of Olive Mill Solid Waste reaches high phenols and solids removal.•Cobalt supplementation allows improvement on methane production rate up to 25%.•Cobalt supplementation allows an enhancement on methane yield coefficient up to 30%.•Dissolved Co is more accurately related with the b...

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Bibliographic Details
Published in:Bioresource technology 2016-07, Vol.211, p.58-64
Main Authors: Pinto-Ibieta, F., Serrano, A., Jeison, D., Borja, R., Fermoso, F.G.
Format: Article
Language:English
Subjects:
Anaerobiosis
Bioreactors
Cobalt - chemistry
Cobalt fractionation
Improved anaerobic digestion
Metals
Methane - analysis
Methane - biosynthesis
Methane production rate
Olea
Olea - chemistry
Olea - metabolism
Olive Mill Solid Waste
Trace Elements - metabolism
Trace metal requirements
Waste Management - methods
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Summary:•Biomethanization of Olive Mill Solid Waste reaches high phenols and solids removal.•Cobalt supplementation allows improvement on methane production rate up to 25%.•Cobalt supplementation allows an enhancement on methane yield coefficient up to 30%.•Dissolved Co is more accurately related with the biological response than total Co.•System variations vary the relation between dissolved Co and the biological response. Due to the low trace metals concentration in the Olive Mill Solid Waste (OMSW), a proposed strategy to improve its biomethanization is the supplementation of key metals to enhance the microorganism activity. Among essential trace metals, cobalt has been reported to have a crucial role in anaerobic degradation. This study evaluates the effect of cobalt supplementation to OMSW, focusing on the connection between fractionation of cobalt in the system and the biological response. The highest biological responses was found in a range from 0.018 to 0.035mg/L of dissolved cobalt (0.24–0.65mg total cobalt/L), reaching improvements up to 23% and 30% in the methane production rate and the methane yield coefficient, respectively. It was found that the dissolved cobalt fraction is more accurately related with the biological response than the total cobalt. The total cobalt is distorted by the contribution of dissolved and non-dissolved inert fractions.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.03.031