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Ultrasound-Assisted Demineralization Process of Sugarcane Straw and Its Influence on the Further Biomass Conversion

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  • Daniel Santos

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

  • Karen Giacobe

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

  • Carolina M. Silva

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

  • Loisleini F. Saldanha

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

  • Ayrton F. Martins

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

  • Erico M. M. Flores

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

  • Cezar A. Bizzi

    (Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil)

Abstract

Lignocellulosic materials have been considered as an alternative source from which liquid biofuel and fine chemicals can be produced with a moderate environmental impact. However, they can be contaminated with metals, soil, and ash, owing incrustation and corrosion of industrial reactors and pipelines. In this work, the use of ultrasound energy was applied for the removal of metals and nonmetals (Ba, Ca, Mg, Mn, P, S, Si, and Sr) from sugarcane straw. Ultrasound-assisted demineralization (UAD) experiments were carried out in ultrasonic baths in several frequencies (from 25 up to 130 kHz). The following experimental conditions were evaluated: demineralization solution (HNO 3 , HCl, H 2 SO 4 , H 2 O 2 , and H 2 O), H 2 O 2 concentration (from 5 to 30% v v −1 ), extraction temperature (from 30 to 70 °C), sonication time (from 5 to 45 min), and ultrasound amplitude (from 10 to 70%). Better demineralization efficiencies (66%) were obtained employing an ultrasound bath operating at 25 kHz for 30 min, ultrasound amplitude of 60%, and using a diluted H 2 O 2 solution (15% v v −1 ) at 70 °C. When the obtained results were compared with those obtained by mechanical stirring (MS, 500 rpm), it was observed that the use of ultrasound energy increased the demineralization efficiency up to 16%. Furthermore, acid hydrolysis was performed to evaluate the influence of US and mechanical stirring in fermentable sugars’ production. The total sugars’ yield (glucose, xylose, and arabinose) increased around 55% for both systems (US and MS). To prove the applicability of the proposed process, some experiments for scaling up were performed using several reaction loads (0.5 to 3 L). An attempt for scaling the proposed process up was well succeeded up to a 3 L load. Therefore, the proposed ultrasound-assisted procedure can be considered as a suitable alternative for high-efficiency demineralization from sugarcane straw.

Suggested Citation

  • Daniel Santos & Karen Giacobe & Carolina M. Silva & Loisleini F. Saldanha & Ayrton F. Martins & Erico M. M. Flores & Cezar A. Bizzi, 2022. "Ultrasound-Assisted Demineralization Process of Sugarcane Straw and Its Influence on the Further Biomass Conversion," Sustainability, MDPI, vol. 14(1), pages 1-13, January.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:1:p:557-:d:718018
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    References listed on IDEAS

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    1. Dias, Marina O.S. & Junqueira, Tassia L. & Cavalett, Otávio & Pavanello, Lucas G. & Cunha, Marcelo P. & Jesus, Charles D.F. & Maciel Filho, Rubens & Bonomi, Antonio, 2013. "Biorefineries for the production of first and second generation ethanol and electricity from sugarcane," Applied Energy, Elsevier, vol. 109(C), pages 72-78.
    2. Negrão, Djanira R. & Grandis, Adriana & Buckeridge, Marcos S. & Rocha, George J.M. & Leal, Manoel Regis L.V. & Driemeier, Carlos, 2021. "Inorganics in sugarcane bagasse and straw and their impacts for bioenergy and biorefining: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
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    Cited by:

    1. Luis F. O. Silva & Hongya Niu, 2022. "Editorial: Nano- and Micro-Contaminants and Their Effect on the Humans and Environment," Sustainability, MDPI, vol. 14(10), pages 1-5, May.

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