Title:	Oxalic acid boosts phosphorus release from sewage sludge biochar: a key mechanism for biochar-based fertilizers.
Authors:	SANTOS, M. G. B. dos COSTA, C. R. MENDES, G. de O. PAIVA, A. B. PEIXOTO, L. S. COSTA, J. da L. MARCHI, G. MARTINS, E. de S. FIGUEIREDO, C. C. de
Affiliation:	MARCELA GRANATO BARBOSA DOS SANTOS, UNIVERSIDADE DE BRASÍLIA; CAMILA RODRIGUES COSTA, UNIVERSIDADE DE BRASÍLIA; GILBERTO DE OLIVEIRA MENDES, UNIVERSIDADE FEDERAL DE UBERLÂNDIA; ANDRESSA BLASI PAIVA, UNIVERSIDADE DE BRASÍLIA; LUDMILA SOARES PEIXOTO, UNIVERSIDADE DE BRASÍLIA; JÉSSICA DA LUZ COSTA, UNIVERSIDADE DE BRASÍLIA; GIULIANO MARCHI, CPAC; EDER DE SOUZA MARTINS, CPAC; CÍCERO CÉLIO DE FIGUEIREDO, UNIVERSIDADE DE BRASÍLIA.
Date Issued:	2024
Citation:	Agriculture, v. 14, 1607, 2024.
Pages:	14 p.
Description:	Sewage sludge biochar (SSB) exhibits higher phosphorus (P) concentrations than the original sewage sludge (SS) and can be used as a P fertilizer. However, SSB-associated P is strongly retained in chemical compounds, which hinders its release and subsequent plant uptake. The use of organic acids facilitates P solubilization from SSB. Herein, we evaluated the effect of oxalic acid on P release from SSB applied to soil over time. Biochar was produced at 300 ◦C (SSB300) and 500 ◦C (SSB500). P release from SSB increased with an increasing concentration of oxalic acid in the SSB incubation solution and in SSB-treated soil. P speciation in SSB showed that P was predominantly inorganic (Pi), which represented 81% and 92% of the total P in SSB300 and SSB500, respectively. Pi in SSB consisted mainly of non-apatite P, accounting for 91% and 96% of all Pi in SSB300 and SSB500, respectively. Because SSB is predominantly insoluble in water, oxalic acid is crucial for the release of P from SSB. Oxalic acid increased P release from SSB300 and SB500 by 103- and 600-fold, respectively, compared to the control, from which P was extracted with water. Oxalic acid enhancement of Prelease from SSB increases the possibility of using SSB as a sustainable source of P for agriculture.
Thesagro:	Adubo de Esgoto Fertilizante Fosfatado Ácido Oxálico
NAL Thesaurus:	Pyrolysis Biosolids Phosphorus
Keywords:	Biocarvão
ISSN:	2077-0472
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAC)