Effect of Short-Time Hydrothermal Carbonization on the Properties of Hydrochars Prepared from Olive-Fruit Endocarps

Cuevas, Manuel Bruña; Martínez-Cartas, María Lourdes; Sánchez, Sebastián

doi:10.1021/acs.energyfuels.8b03335

Cited by 14 publications

(10 citation statements)

References 41 publications

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“…Furthermore, the short-time hydrothermal carbonization caused an increase in the hydrophobic capacity of the hydrochar, which contributes to improving the microbial stability of the material. These authors [93] also indicated that the hydrothermal carbonization has a greater capacity than pyrolysis to eliminate the OS components with lower calorific value (extractives and hemicelluloses) at low temperatures from the raw material.…”

Section: Torrefactionmentioning

confidence: 99%

“…Torrefaction can be conducted in an aqueous (wet torrefaction or hydrothermal carbonization) or dry (dry torrefaction) environment. A study on the rapid hydrothermal carbonization of OS at temperatures between 175 • C and 250 • C pointed out that the solid residue (hydrochar) obtained at 225 • C-10 min had the highest HHV (23.4 MJ/kg), energy efficiency (74.7%) and comprehensive combustibility index (6.19 × 10 −7 min −2 • C −3 ) [93]. Furthermore, the short-time hydrothermal carbonization caused an increase in the hydrophobic capacity of the hydrochar, which contributes to improving the microbial stability of the material.…”

Section: Torrefactionmentioning

confidence: 99%

“…From the thermogravimetric data it can be verified that there are two different combustion stages. The first stage corresponds to the oxidation of the volatile matter removed from the solid at low relative temperatures and can be clearly observed in a differential thermogravimetric analysis (DTG analysis) in the peaks found in the range 200-400 • C, which are related to the combustion of the volatile matter and the breakdown of hemicellulose and cellulose [93,99]. To be specific, the decomposition of hemicellulose occurs from 220 • C to 315 • C while the breakdown of cellulose takes place between 320 • C and 400 • C. The second stage consists of the heterogeneous combustion of the char obtained from the pyrolysis of the polysaccharides and lignin.…”

Section: Combustionmentioning

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: Torrefactionmentioning

confidence: 99%

Section: Torrefactionmentioning

confidence: 99%

Section: Combustionmentioning

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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“…Several biomass feedstocks (i.e., hardwoods, softwoods, and agricultural wastes) have been used for HTC processing. − In this study, grape seeds, which are waste from the production of wine and fruit juice, were subjected to HTC processing at various temperatures (200, 225, and 250 °C), reaction times (6, 12, and 24 h), and biomass:water ratios (0.025, 0.05, and 0.1). The effects of process variables on hydrochar yields and properties were studied.…”

Section: Introductionmentioning

confidence: 99%

Effects of Metal Chlorides on the Hydrothermal Carbonization of Grape Seeds

et al. 2021

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In this study, hydrothermal carbonization (HTC) of grape seeds, a lignocellulosic biomass, was carried out at various temperatures (200, 225, and 250 °C), different reaction times (6, 12, and 24 h), and different biomass:water ratios (0.025, 0.05, and 0.1). The most important parameter affecting the yields and characteristics of hydrochars was found to be temperature. The HTC of grape seeds was then conducted in the presence of metal chlorides (i.e., CsCl, ZnCl 2 , and SnCl 2 ) at temperatures of 200, 225, and 250 °C for 12 h. SnCl 2 behaved very differently in the HTC process than the other catalysts (or no catalyst). A major difference among these catalysts was the extent to which they were incorporated within the hydrochar structure. SnCl 2 was much more readily incorporated than was CsCl or ZnCl 2 . Carbon microspheres were observed in hydrochars from obtained biomass without a catalyst and with CsCl and ZnCl 2 catalysts; agglomerated carbon nanospheres were observed in hydrochars produced with SnCl 2 . Hydrochars obtained at 225 and 250 °C by using SnCl 2 and ZnCl 2 catalysts were in the lignite class, while hydrochars obtained from biomass without a catalyst, and using CsCl, were in the peat coal class.

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“…[5]. Several agricultural biomasses have been experimented as low-cost adsorbent including coconut shell [6], cattle paunch [7], maize straw [8], olive fruit endocarps [9] and bamboo shoot shell [10]. With the widespread use of pollutant amendment IOP Publishing doi:10.1088/1742-6596/2266/1/012005 2 [11][12] [13], biochar was a viable option for the immobilisation of many pollutants, including heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Process Parameters on Treated Banana Peel Bioadsorbent for Heavy Metals Removal

Nadhirah

Manisah

Nabihah

et al. 2022

J. Phys.: Conf. Ser.

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Heavy metals have previously been removed from aqueous media using activated carbon as an adsorbent but due to its high cost, researchers are working to develop low-cost adsorbents from agricultural products and by-products. In this research, fresh banana peels were utilised as raw materials, and they were subsequently carbonised using the hydrothermal carbonization (HTC) method to generate an efficient hydrochar adsorbent with the participation of potassium hydroxide (KOH) solution. Pure standard of Fe, Mn and Zn were used as the stock solution for the heavy metal ions removal. The catalysis of KOH with concentration ranging from 0% to 50% by weight were utilized as the reaction media. Parameters including the dosage, metal concentrations, contact time and pH value were carefully investigated. According to the results of concentrations of heavy metals before and after adsorption obtained from AAS, hydrochar produced in 30%wt KOH exhibit the most adsorption capacity and Zn removal exhibit the highest adsorption among all three metal ions used at 83% removal efficiency. The presence of a high number of oxygen functional groups (OFG) is confirmed by FTIR findings, that influence the adsorption reaction. As a result, chemically modified banana peels can be used as a low-cost alternative to other expensive adsorbents for heavy metal removal, and HTC could be a viable technique for producing low-cost adsorbents.

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Effect of Short-Time Hydrothermal Carbonization on the Properties of Hydrochars Prepared from Olive-Fruit Endocarps

Cited by 14 publications

References 41 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

Effects of Metal Chlorides on the Hydrothermal Carbonization of Grape Seeds

Evaluation of Process Parameters on Treated Banana Peel Bioadsorbent for Heavy Metals Removal

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