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

Shefali Aktar, Md Afzal Hossain, Gabriel Gasco, Ana Mendez, Cicero Celio de Figueiredo, Kalpit Shah and Jorge Paz-Ferreiro ()
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Shefali Aktar: Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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

Land, 2024, vol. 13, issue 12, 1-13

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.

Keywords: pyrolysis; temperature; carrier gases; CO 2; P speciation; 31 P NMR (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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