Evaluation of the potential for energy recovery from olive oil industry waste: Thermochemical conversion technologies as fuel improvement methods

Fuel ◽  
2020 ◽  
Vol 279 ◽  
pp. 118536 ◽  
Author(s):  
Leonel J.R. Nunes ◽  
Liliana M.E.F. Loureiro ◽  
Letícia C.R. Sá ◽  
Hugo F.C. Silva
Recycling ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 12 ◽  
Author(s):  
Leonel J. R. Nunes ◽  
Liliana M. E. F. Loureiro ◽  
Letícia C. R. Sá ◽  
Hugo F.C. Silva

The demand for new sources of energy is one of the main quests for humans. At the same time, there is a growing need to eliminate or recover a set of industrial or agroforestry waste sources. In this context, several options may be of interest, especially given the amounts produced and environmental impacts caused. Olive pomace can be considered one of these options. Portugal, as one of the most prominent producers of olive oil, therefore, also faces the problem of dealing with the waste of the olive oil industry. Olive pomace energy recovery is a subject referenced in many different studies and reports since long ago. However, traditional forms of recovery, such as direct combustion, did not prove to be the best solution, mainly due to its fuel properties and other characteristics, which cause difficulties in its storage and transportation as well. Torrefaction and pyrolysis can contribute to a volume reduction, optimizing storage and transportation. In this preliminary study, were carried out torrefaction and pyrolysis tests on olive pomace samples, processed at 300 °C, 400 °C, and 500 °C, followed by laboratory characterization of the materials. It was verified an improvement in the energy content of the materials, demonstrating that there is potential for the use of these thermochemical conversion technologies for the energy recovery of olive pomace.


2020 ◽  
Vol 10 (18) ◽  
pp. 6481 ◽  
Author(s):  
Leonel J. R. Nunes ◽  
Liliana M. E. F. Loureiro ◽  
Letícia C. R. Sá ◽  
Hugo F. C. Silva

The sugarcane industry has assumed an increasingly important role at a global level, with countries such as Brazil and India dominating the field. However, this causes environmental problems, since the industry produces large amounts of waste, such as sugarcane bagasse. This by-product, which is energetically partially recovered in sugar mills and in the pulp and paper industry, can make a significant contribution to the general use of biomass energy, if the usual disadvantages associated with products with low density and a high moisture content are overcome. From this perspective, thermochemical conversion technologies, especially torrefaction, are assumed to be capable of improving the fuel properties of this material, making it more appealing for potential export and use in far-off destinations. In this work, sugarcane samples were acquired, and the process of obtaining bagasse was simulated. Subsequently, the bagasse was dried and heat-treated at 200 and 300 °C to simulate the over-drying and torrefaction process. Afterward, product characterization was performed, including thermogravimetric analysis, elemental analysis, calorimetry, and energy densification. The results showed significant improvements in the energy content, from 18.17 to 33.36 MJ·kg−1 from dried bagasse to torrefied bagasse at 300 °C, showing that despite high mass loss, there is potential for a future value added chain for this waste form, since the increment in energy density could enhance its transportation and use in locations far off the production site.


2003 ◽  
Vol 23 (2) ◽  
pp. 197-214 ◽  
Author(s):  
Antonio C. Caputo ◽  
Federica Scacchia ◽  
Pacifico M. Pelagagge

2017 ◽  
Vol 9 (9) ◽  
pp. 1566 ◽  
Author(s):  
Raffaella Branciari ◽  
Roberta Galarini ◽  
Danilo Giusepponi ◽  
Massimo Trabalza-Marinucci ◽  
Claudio Forte ◽  
...  

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