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Combination of Dry Milling and Separation Processes with Anaerobic Digestion of Olive Mill Solid Waste: Methane Production and Energy Efficiency

1
LBE, Université de Montpellier, INRA, 102 Avenue des Etangs, F-11100 Narbonne, France
2
LCME, FST Marrakech, Université Cadi Ayyad, Marrakech 40000, Morocco
3
Mohammed VI Polytechnic University (UM6P), 43150 Benguerir, Morocco
4
OCP Group, Complexe industriel Jorf Lasfar, BP 118 El Jadida, Morocco
5
IATE, CIRAD, Montpellier SupAgro, INRA, Université de Montpellier, 34060 Montpellier, France
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(12), 3295; https://doi.org/10.3390/molecules23123295
Received: 8 November 2018 / Revised: 7 December 2018 / Accepted: 8 December 2018 / Published: 12 December 2018
(This article belongs to the Special Issue Biodegradation and Effectively Utilization of Organic Residues)
This experimental work aims at investigating the effects of milling; sieving; and electrostatic separation on the biochemical methane potential of two olive pomaces from traditional olive oil extraction (M) and from a three-phase system (T). Sieving proved to be efficient for increasing the soluble chemical oxygen demand in the smallest fractions of the sieve of both M (62%) and T (78%) samples. The positive fraction following electrostatic separation also enhanced chemical oxygen demand (COD) solubilisation by 94%, in comparison to sample T milled at 4 mm. Sieve fractions with a size greater than 0.9 mm contained 33% and 47% less lipids for the M and T biomasses; respectively. Dry fractionation modified sample properties as well as lipid and fiber distribution. Concomitantly; milling increased the accessibility and facilitated the release of organic matter. The energy balance was positive after knife milling and sieving; while ball milling and ultrafine milling proved to be inefficient. View Full-Text
Keywords: anaerobic digestion; pretreatment; energy efficiency; electrostatic separation; milling; sieving anaerobic digestion; pretreatment; energy efficiency; electrostatic separation; milling; sieving
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Elalami, D.; Carrère, H.; Abdelouahdi, K.; Oukarroum, A.; Dhiba, D.; Arji, M.; Barakat, A. Combination of Dry Milling and Separation Processes with Anaerobic Digestion of Olive Mill Solid Waste: Methane Production and Energy Efficiency. Molecules 2018, 23, 3295.

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