Hydrothermal carbonization of microalgae biomass produced in agro-industrial effluent: Products, characterization and applications.

Autor: Castro JS; Department of Civil Engineering, Federal University of Viçosa, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil. Electronic address: jackeline.castro@ufv.br., Assemany PP; Department of Environmental Engineering, Federal University of Lavras (Universidade Federal de Lavras), Campus Universitário, Lavras, Minas Gerais 37200-900, Brazil., Carneiro ACO; Department of Forest Engineering, Federal University of Viçosa, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil., Ferreira J; Department of Civil Engineering, Federal University of Viçosa, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil., de Jesus Júnior MM; Department of Chemical Engineering, Federal University of Viçosa, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil., Rodrigues FÁ; Department of Chemical Engineering, Federal University of Viçosa, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil., Calijuri ML; Department of Civil Engineering, Federal University of Viçosa, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 May 10; Vol. 768, pp. 144480. Date of Electronic Publication: 2021 Jan 05.
DOI: 10.1016/j.scitotenv.2020.144480
Abstrakt: Hydrothermal carbonization is a thermochemical treatment whose objective is to convert carbohydrate components of a given biomass into carbon-rich material in an aqueous medium. Biomass of wastewater grown microalgae is among the various potential biomasses for this route. However, operational parameters of hydrothermal carbonization for different types of biomass are still being investigated. In general, larger temperature ranges (180-260 °C) are applied to woody biomasses, which have fibrous and/or ligneous structures and, therefore, are more thermally stable than algae biomass. This study presents the hydrothermal carbonization of microalgae biomass cultivated in an agro-industrial effluent. For this purpose, a Parr reactor was operated at different temperatures (130, 150 and 170 °C) and retention times (10, 30 and 50 min). Results showed improvements in the properties of the hydrochar, mainly energy yield and carbon concentration, after the thermochemical treatment. Energy recovery was improved, as well as hydrophobicity of the carbonized material. It was observed that in the retention time of 10 min, the increase in temperature provided an increase of 7.53% in the yield of solids. On the other hand, in the retention times of 30 and 50 min, when the temperature was increased, the solid yield decreased 6.70% and 0.92%, respectively. Thus, the highest yield of solids (77.72%) and energy (78.21%) was obtained at the temperature of 170 °C and retention time of 10 min. There was a high ash content in the raw biomass (32.99%) and an increase of approximately 3% in the carbonized material, regardless of the applied treatment. With the exception of potassium and sodium, the other macro and micronutrients were concentrated in the hydrochar after thermochemical treatment, indicating the potential of the material for agriculture application, in addition to energy use. Results showed that the retention time was the most significant operational parameter of the process.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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