Multistage milling and classification for improving both pellet quality and biogas production from hazelnut and olive pruning

Costa, Paolo; Dell’Omo, Pier Paolo; Froscia, Sabatino La

doi:10.3166/acsm.42.471-487

Cited by 4 publications

(8 citation statements)

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“…Scarce information about methane production from OP can be found in literature. The finest OP particles have been reported as the most suitable for methane production due to their high concentration of nitrogenous matter and low C/N ratios, which make these OP suitable for anaerobic digestion [61]. After the application of a fractionation process to obtain the finest OP particles and the subsequent batch anaerobic digestion at 38 • C, the highest methane yield achieved by these authors was 176.5 Nm 3 per t volatile solids, which accounted for 93.5% gains over the untreated OP.…”

Section: Methane Generationmentioning

confidence: 99%

“…After the application of a fractionation process to obtain the finest OP particles and the subsequent batch anaerobic digestion at 38 • C, the highest methane yield achieved by these authors was 176.5 Nm 3 per t volatile solids, which accounted for 93.5% gains over the untreated OP. The authors described their process as highly energy efficient, since energy consumption was low compared with the energy required by the residues of fuel upgrading, intended for anaerobic digestion [61]. Nevertheless, there is other olive mill wastes with higher potential for anaerobic digestion and therefore methane production, such as olive pomace and, mainly, olive mil wastewater.…”

Section: Methane Generationmentioning

confidence: 99%

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Energetic Valorisation of Olive Biomass: Olive-Tree Pruning, Olive Stones and Pomaces

et al. 2020

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Olive oil industry is one of the most important industries in the world. Currently, the land devoted to olive-tree cultivation around the world is ca. 11 × 106 ha, which produces more than 20 × 106 t olives per year. Most of these olives are destined to the production of olive oils. The main by-products of the olive oil industry are olive-pruning debris, olive stones and different pomaces. In cultures with traditional and intensive typologies, one single ha of olive grove annually generates more than 5 t of these by-products. The disposal of these by-products in the field can led to environmental problems. Notwithstanding, these by-products (biomasses) have a huge potential as source of energy. The objective of this paper is to comprehensively review the latest advances focused on energy production from olive-pruning debris, olive stones and pomaces, including processes such as combustion, gasification and pyrolysis, and the production of biofuels such as bioethanol and biodiesel. Future research efforts required for biofuel production are also discussed. The future of the olive oil industry must move towards a greater interrelation between olive oil production, conservation of the environment and energy generation.

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Section: Methane Generationmentioning

confidence: 99%

Section: Methane Generationmentioning

confidence: 99%

Energetic Valorisation of Olive Biomass: Olive-Tree Pruning, Olive Stones and Pomaces

et al. 2020

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“…However, the critical issues highlighted above could be bypassed considering the possibility of mixing this material with woods of other species to reach the quality classes A1 and A2 [82][83][84] and using an industrial-scale device to mill the residues [52,53]. If the mixing of materials allows compliance with the standard requirements, pellets of hazelnut and olives could be a good choice for entering the biofuel market for companies located in important production areas.…”

Section: Discussionmentioning

confidence: 99%

“…Each of the studies highlighted both positive and critical aspects of the pellets themselves. The most critical parameters found in these studies were mainly related to the ash and nitrogen content for the vineyard [49,50], spent coffee [51], hazelnut, and olive tree [52,53]. At the same time, for the 3 and 6-year-old poplar pellets, there were problems with bulk density and ash, but not of nitrogen [54].…”

Section: Introductionmentioning

confidence: 88%

Qualitative Characterization of the Pellet Obtained from Hazelnut and Olive Tree Pruning

Acampora¹,

Civitarese²,

Sperandio³

et al. 2021

Energies

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Biomass occupies a very important place among renewable energy sources, and the residual biomass recovery chain represents a sector of fundamental importance. Our work focused on the production of pellets by pruning residues from two of the most important woody crops in Italy: hazelnut and olive groves. We found a higher value of bulk density for the hazelnut pellet (581.30 kg m−3 vs. 562.38 kg m−3) and a higher value of length for the olive pellet (16.66 mm vs. 10.47 mm). The percentages of durability were very similar (98%). The low heating value and ash content of hazelnut and olive were 17.21 MJ kg−1 and 3.1%, and 16.83 MJ kg−1 and 2.5%. A higher concentration of Cu, Pb, and Ni was observed in the hazelnut. The contrary was observed for the concentration of Zn. N content was 0.77% and 1.24% for the hazelnut and the olive, respectively. The concentration of S was 0.00% for both. The quality parameters that do not meet current standards could be improved by mixing these materials with different types of wood.

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“…Nonetheless, olive mil waste has a higher potential for anaerobic digestion and hence methane production. Since around 10-12 million cubic meters of Olive Mill Wastewater are produced yearly, it is possible that researchers have focused on this issue-explaining the lack of information on methane production from OTPB (Costa et al, 2018).…”

Section: Biochemical Treatmentsmentioning

confidence: 99%

Olive Leaf Waste Management

Espeso

Isaza

Lee

et al. 2021

Front. Sustain. Food Syst.

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Olive trees are the oldest known cultivated trees in the world and present-day cultivation is widespread, with an estimated magnitude of 9 million hectares worldwide. As the olive oil industry has continued to grow, so has the environmental impact of olive oil production, such as the energy and water consumption, gas emissions and waste generation. The largest contributor to waste generation are the olive leaves, an abundant and unavoidable byproduct of olive-oil production due to the necessity of tree-pruning. It is estimated that an annual 1.25 million tons of olive leaf waste are generated in Spain alone, around 50% of the total world production. The leaves are currently used for biomass production or animal feed. However, because of their polyphenolic composition, olive leaves have potential in numerous other applications. In this review we analyze the chemical composition of olive leaves, and discuss current processing methods of the olive leaf waste, including thermochemical, biochemical, drying, extraction and condensation methods. We also examine current applications of the treated olive leaves in sectors relating to cattle feed, fertilizers, novel materials, energy generation, and food and pharmaceutical products. The aim of this review is to provide a resource for producers, policy makers, innovators and industry in shaping environmentally sustainable decisions for how olive leaf waste can be utilized and optimized.

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Multistage milling and classification for improving both pellet quality and biogas production from hazelnut and olive pruning

Cited by 4 publications

References 0 publications

Energetic Valorisation of Olive Biomass: Olive-Tree Pruning, Olive Stones and Pomaces

Energetic Valorisation of Olive Biomass: Olive-Tree Pruning, Olive Stones and Pomaces

Qualitative Characterization of the Pellet Obtained from Hazelnut and Olive Tree Pruning

Olive Leaf Waste Management

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