In this work, the biogas production from a new type of date palm fruit wastes was studied. The effect of
solid mixing ratio, temperature, and recycled digestate on the biogas recovery was evaluated. The batch
anaerobic digester was run at solid mixing ratios of 0.5, 0.25, 0.15 and 0.1 under mesophilic and thermophilic
conditions. The results revealed that among the four mixing ratios, the ratio of 0.15 generated
the highest biogas yield of 182 L/kgVS with 63% methane composition in biogas. A maximum biogas
delivery of 203 L/kgVS was reached using recycled digestate wastes with 25% of the substrate content.
Further, results confirmed that the biogas production was higher at mesophilic conditions due to the
extra formation of volatile fatty acids at the thermophilic conditions. In order to make the results of this
study applicable to the biogas plant operation, the process was carried out without chemical pretreatment,
mixing operation, and the addition of external inoculums materials to the substrate
In this work, the biogas production from a new type of date palm fruit wastes was studied. The effect ofsolid mixing ratio, temperature, and recycled digestate on the biogas recovery was evaluated. The batchanaerobic digester was run at solid mixing ratios of 0.5, 0.25, 0.15 and 0.1 under mesophilic and thermophilicconditions. The results revealed that among the four mixing ratios, the ratio of 0.15 generatedthe highest biogas yield of 182 L/kgVS with 63% methane composition in biogas. A maximum biogasdelivery of 203 L/kgVS was reached using recycled digestate wastes with 25% of the substrate content.Further, results confirmed that the biogas production was higher at mesophilic conditions due to theextra formation of volatile fatty acids at the thermophilic conditions. In order to make the results of thisstudy applicable to the biogas plant operation, the process was carried out without chemical pretreatment,mixing operation, and the addition of external inoculums materials to the substrate
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