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Effects of Temperature and Carrier Gas on Phosphorus Transformation in Biosolids Biochar

Author

Listed:
  • Shefali Aktar

    (Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
    Department of Biochemistry and Molecular Biology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh)

  • Md Afzal Hossain

    (Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh)

  • Gabriel Gasco

    (Department of Agricultural Production, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040 Madrid, Spain)

  • Ana Mendez

    (Department of Geological and Mining Engineering, Universidad Politécnica de Madrid, 28040 Madrid, Spain)

  • Cicero Celio de Figueiredo

    (Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília 04508, DF, Brazil)

  • Kalpit Shah

    (Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia)

  • Jorge Paz-Ferreiro

    (Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia)

Abstract

Phosphorus (P) is an essential macronutrient for plants. The focus of this work is to recover P from biosolids and their derived biochar. The effect of three different pyrolysis temperatures (400 °C, 500 °C, and 600 °C) and two carrier gases (CO 2 and N 2 ) on P fractionation and the speciation of P on biochars produced from two biosolids were investigated. The Hedley chemical sequential extraction method and 31 P liquid NMR were used for P characterization and quantification. Higher pyrolysis temperatures increased P fixation and decreased short-term P bioavailability. Carrier gas had also significant effects on P fractionation in the biochars. Biochar produced in a CO 2 environment had slightly higher water-soluble P, NaHCO 3 -P i , NaOH-P i , and residual P than in biochar prepared in a N 2 environment, while HCl-P showed the opposite trend. Additionally, the predominant molecular configuration of P was present in the inorganic form identified by 31 P liquid NMR spectra, while organic P transformed into inorganic P with increasing pyrolysis temperature.

Suggested Citation

  • Shefali Aktar & Md Afzal Hossain & Gabriel Gasco & Ana Mendez & Cicero Celio de Figueiredo & Kalpit Shah & Jorge Paz-Ferreiro, 2024. "Effects of Temperature and Carrier Gas on Phosphorus Transformation in Biosolids Biochar," Land, MDPI, vol. 13(12), pages 1-13, December.
    • Handle: RePEc:gam:jlands:v:13:y:2024:i:12:p:2132-:d:1539548
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