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Co-Incineration of Rice Straw-Wood Pellets: A Sustainable Strategy for the Valorisation of Rice Waste

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  • Cristina Moliner

    (Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Università degli Studi di Genova, Via Opera Pia 15A, 16145 Genova, Italy)

  • Dario Bove

    (Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Università degli Studi di Genova, Via Opera Pia 15A, 16145 Genova, Italy)

  • Elisabetta Arato

    (Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Università degli Studi di Genova, Via Opera Pia 15A, 16145 Genova, Italy)

Abstract

Agricultural activities produce an estimated amount of 32.7 MToe/year of residues in EU countries. They are mostly disposed in landfills, incinerated without any control, or abandoned in fields, causing severe impacts on human health and environment. Rice is one of the most consumed crops worldwide with an annual production of 782 million tons according to the Food and Agriculture Organization of the United Nations database. In this context, the EU-funded project LIFE LIBERNITRATE promotes the use of renewable residual sources (i.e., rice straw) to obtain new materials with an added value. The methodology is based on the incineration of rice straw in an own-designed and constructed valorization system. Rice straw/wood pellets are burned in optimized conditions to produce a maximized quantity of ashes with high silica content. These materials will be then used to treat water polluted with nitrates, representing an optimal example of circular economy strategy. In this work, the own-designed valorization unit is described, with special focus on its main constituting elements. The theoretical study of the co-incineration of rice straw and wood pellets identified the optimised combustion conditions. Experimental tests using the theoretical inputs confirmed the most adequate operational conditions (10 g rice straw pellets/min + 10 g wood pellets/min, 6–7 Nm 3 /h of air, T = 500 °C) and helped in the definition of improvements on the experimental plant.

Suggested Citation

  • Cristina Moliner & Dario Bove & Elisabetta Arato, 2020. "Co-Incineration of Rice Straw-Wood Pellets: A Sustainable Strategy for the Valorisation of Rice Waste," Energies, MDPI, vol. 13(21), pages 1-14, November.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5750-:d:439141
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    References listed on IDEAS

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    1. Suramaythangkoor, Tritib & Gheewala, Shabbir H., 2010. "Potential alternatives of heat and power technology application using rice straw in Thailand," Applied Energy, Elsevier, vol. 87(1), pages 128-133, January.
    2. Cristina Moliner & Roberto Teruel-Juanes & Carmem T. Primaz & Jose David Badia & Barbara Bosio & Pilar Campíns-Falcó & Carmen Molíns-Legua & Francesc Hernandez & Lorenzo Sanjuan-Navarro & Plàcid Madra, 2018. "Reduction of Nitrates in Waste Water through the Valorization of Rice Straw: LIFE LIBERNITRATE Project," Sustainability, MDPI, vol. 10(9), pages 1-12, August.
    3. Stefano Cascone & Renata Rapisarda & Dario Cascone, 2019. "Physical Properties of Straw Bales as a Construction Material: A Review," Sustainability, MDPI, vol. 11(12), pages 1-19, June.
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    1. Krzysztof Mudryk & Marcin Jewiarz & Marek Wróbel & Marcin Niemiec & Arkadiusz Dyjakon, 2021. "Evaluation of Urban Tree Leaf Biomass-Potential, Physico-Mechanical and Chemical Parameters of Raw Material and Solid Biofuel," Energies, MDPI, vol. 14(4), pages 1-14, February.
    2. Michela Mazzoccoli & Elisabetta Arato & Cristina Moliner, 2022. "Environmental Valorization of Rice Waste as Adsorbent Material for the Removal of Nitrates from Water," Energies, MDPI, vol. 15(7), pages 1-12, April.
    3. Maurizio Bressan & Elena Campagnoli & Carlo Giovanni Ferro & Valter Giaretto, 2022. "Rice Straw: A Waste with a Remarkable Green Energy Potential," Energies, MDPI, vol. 15(4), pages 1-15, February.

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