Effect of the reaction medium on the immobilization of nutrients in hydrochars obtained using sugarcane industry residues

Author(s)

Silva, Camila Centurion ; Melo, Camila Almeida ; Soares Junior, Francisco Holanda ; Moreira, Altair Benedito ; Ferreira, Odair Pastor ; Bisinoti, Marcia Cristina

• Document type: Journal article
• Source: Bioresource Technology; v. 237, p. 9-pg., 2017-08-01.

Abstract

In this study, nutrients were immobilized on the hydrochars obtained by hydrothermal carbonization (HTC) of a vinasse and sugarcane bagasse mixture, in the presence of acid, base and salt additives at temperatures of 150, 190 and 230 degrees C. The increase in temperature caused higher immobilization of Ca, Mg, K, N, Cu, Mn, Zn, B, P and Fe in all hydrochars produced. H3PO4 and NaOH immobilized higher amounts of P, Mg and Mn, while Ca was immobilized in higher quantities in the presence of H3PO4 and (NH4)(2)SO4. The addition of H2SO4, H3PO4 and (NH4)(2)SO4 was responsible for an increased immobilization of P, N, Ca, Mg and K. The immobilization of B, not present in the starting raw material, was possible with the addition of H3BO3. The results showed that it is possible to alter the reaction medium to immobilize nutrients on hydrochars produced from vinasse and sugarcane bagasse, for agricultural applications. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 13/21776-7 - Development of a hydrochar from waste sugarcane industry using hydrothermal carbonization seeking agricultural application
• Grantee: Camila de Almeida Melo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/22400-3 - Evaluation of the potential reuse of the Bittern and hidrochar obtained from hydrothermal carbonization of vinasse and sugar bagasse with a view to agricultural application
• Grantee: Altair Benedito Moreira
• Support Opportunities: Regular Research Grants