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Solar Dryer Application for Olive Oil Mill Wastes

Author

Listed:
  • Irene Montero

    (Department of Mechanical Engineering, Energy and Materials, Industrial Engineering School, University of Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain)

  • María Teresa Miranda

    (Department of Mechanical Engineering, Energy and Materials, Industrial Engineering School, University of Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain)

  • Francisco José Sepúlveda

    (Department of Mechanical Engineering, Energy and Materials, Industrial Engineering School, University of Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain)

  • José Ignacio Arranz

    (Department of Mechanical Engineering, Energy and Materials, Industrial Engineering School, University of Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain)

  • Carmen Victoria Rojas

    (Department of Mechanical Engineering, Energy and Materials, Industrial Engineering School, University of Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain)

  • Sergio Nogales

    (Department of Mechanical Engineering, Energy and Materials, Industrial Engineering School, University of Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain)

Abstract

Global waste production has raised recently due to numerous agricultural and industrial activities. Among other actions devoted to waste reduction, revaluation seems to be the most advantageous one from an environmental and economic point of view. In the olive oil sector, by-product management (namely olive pomace, olive mill wastewater, and sludge residue) poses serious problems for companies, with the energy use of these wastes being a feasible option to solve these problems. Due to their high moisture content, drying constitutes the main stage for a possible bio-fuel conversion. This research work deals with the analysis of drying for the three main wastes from olive oil by using a prototype dryer. This equipment has different working regimes depending on the kind of convection (natural or forced for passive and active mode, respectively), the incidence of solar radiation on the product (indirect or mixed type) and the use of an additional system for energy supply (hybrid type). From the results, it could be said that all the wastes were suitable for solar drying. However, drying conditions were different for each case. Olive pomace and olive mill wastewater showed promising results for solar drying application in mixed active mode. Concerning sludge residue, its special physical structure could employ the use of turners for drying, in order to improve heat transfer to the product. Moreover, hybrid active mode enabled a considerable reduction in drying time, being an aspect to take into account for its use during low solar radiation or at night time.

Suggested Citation

  • Irene Montero & María Teresa Miranda & Francisco José Sepúlveda & José Ignacio Arranz & Carmen Victoria Rojas & Sergio Nogales, 2015. "Solar Dryer Application for Olive Oil Mill Wastes," Energies, MDPI, vol. 8(12), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:12:p:12415-14063:d:60524
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    References listed on IDEAS

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    Cited by:

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    2. Farjana, Shahjadi Hisan & Huda, Nazmul & Mahmud, M.A. Parvez & Saidur, R., 2018. "Solar process heat in industrial systems – A global review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2270-2286.
    3. Francisco Álvarez-Sánchez & Jassón Flores-Prieto & Octavio García-Valladares, 2021. "Annual Thermal Performance of an Industrial Hybrid Direct–Indirect Solar Air Heating System for Drying Applications in Morelos-México," Energies, MDPI, vol. 14(17), pages 1-20, August.
    4. Zhongting Hu & Sheng Zhang & Wenfeng Chu & Wei He & Cairui Yu & Hancheng Yu, 2020. "Numerical Analysis and Preliminary Experiment of a Solar Assisted Heat Pump Drying System for Chinese Wolfberry," Energies, MDPI, vol. 13(17), pages 1-16, August.
    5. Gómez-de la Cruz, Francisco J. & Palomar-Carnicero, José M. & Hernández-Escobedo, Quetzalcoatl & Cruz-Peragón, Fernando, 2020. "Determination of the drying rate and effective diffusivity coefficients during convective drying of two-phase olive mill waste at rotary dryers drying conditions for their application," Renewable Energy, Elsevier, vol. 153(C), pages 900-910.
    6. Tobias Zimmer & Andreas Rudi & Simon Glöser-Chahoud & Frank Schultmann, 2022. "Techno-Economic Analysis of Intermediate Pyrolysis with Solar Drying: A Chilean Case Study," Energies, MDPI, vol. 15(6), pages 1-16, March.
    7. El Hage, Hicham & Herez, Amal & Ramadan, Mohamad & Bazzi, Hassan & Khaled, Mahmoud, 2018. "An investigation on solar drying: A review with economic and environmental assessment," Energy, Elsevier, vol. 157(C), pages 815-829.
    8. Mejdi Jeguirim & Patrick Dutournié & Antonis A. Zorpas & Lionel Limousy, 2017. "Olive Mill Wastewater: From a Pollutant to Green Fuels, Agricultural Water Source and Bio-Fertilizer—Part 1. The Drying Kinetics," Energies, MDPI, vol. 10(9), pages 1-16, September.

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