TY - JOUR
T1 - Rock phosphate solubilization by abiotic and fungal-produced oxalic acid
T2 - reaction parameters and bioleaching potential
AU - de Oliveira Mendes, Gilberto
AU - Dyer, Thomas
AU - Csetenyi, Laszlo
AU - Gadd , Geoffrey Michael
N1 - Funding Information:
GOM was supported by the Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES), grant number 001, the Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG), grant number APQ-01842-17, and the Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq), grant number 401485/2016-1. GMG gratefully acknowledges research support of the Geomicrobiology Group from the Natural Environment Research Council, UK (NE/M010910/1 (TeaSe) and NE/M 011275/1 (COG3)). GOM was supported by the Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES), grant number 001, the Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG), grant number APQ-01842-17, and the Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq), grant number 401485/2016-1. GMG gratefully acknowledges research support of the Geomicrobiology Group from the Natural Environment Research Council, UK (NE/M010910/1 (TeaSe) and NE/M 011275/1 (COG3)). We wish to acknowledge the use of the EPSRC funded Physical Sciences Data-science Service hosted by the University of Southampton and STFC under grant number EP/S020357/1, as well as the American Mineralogist Crystal Structure Database.
Publisher Copyright:
© 2021 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology.
PY - 2022/4
Y1 - 2022/4
N2 - Oxalic acid‐producing fungi play an important role in biogeochemical transformations of rocks and minerals and possess biotechnological potential for extraction of valuable elements from primary or waste ores and other solid matrices. This research investigates the extraction of phosphate from rock phosphate (RP) by oxalic acid. Reaction parameters were derived using pure oxalic acid solutions to solubilize RP. It was found that the oxalic acid concentration was the main factor driving reaction kinetics. Excess oxalic acid could retard the reaction due to calcium oxalate encrustation on RP surfaces. However, complete P extraction was reached at stoichiometric proportions of apatite and oxalic acid. This reaction reached completion after 168 h, although most of the P (up to 75%) was released in less than 1 h. Most of the Ca released from the apatite formed sparingly soluble calcium oxalate minerals, with a predominance of whewellite over weddellite. Bioleaching of RP employing biomass‐free spent culture filtrates containing oxalic acid (100 mM) produced by Aspergillus niger extracted ~ 74% of the P contained in the RP. These findings contribute to a better understanding of the reaction between apatite and oxalic acid and provide insights for potential applications of this process for biotechnological production of phosphate fertilizer.
AB - Oxalic acid‐producing fungi play an important role in biogeochemical transformations of rocks and minerals and possess biotechnological potential for extraction of valuable elements from primary or waste ores and other solid matrices. This research investigates the extraction of phosphate from rock phosphate (RP) by oxalic acid. Reaction parameters were derived using pure oxalic acid solutions to solubilize RP. It was found that the oxalic acid concentration was the main factor driving reaction kinetics. Excess oxalic acid could retard the reaction due to calcium oxalate encrustation on RP surfaces. However, complete P extraction was reached at stoichiometric proportions of apatite and oxalic acid. This reaction reached completion after 168 h, although most of the P (up to 75%) was released in less than 1 h. Most of the Ca released from the apatite formed sparingly soluble calcium oxalate minerals, with a predominance of whewellite over weddellite. Bioleaching of RP employing biomass‐free spent culture filtrates containing oxalic acid (100 mM) produced by Aspergillus niger extracted ~ 74% of the P contained in the RP. These findings contribute to a better understanding of the reaction between apatite and oxalic acid and provide insights for potential applications of this process for biotechnological production of phosphate fertilizer.
UR - http://www.scopus.com/inward/record.url?scp=85102349542&partnerID=8YFLogxK
U2 - 10.1111/1751-7915.13792
DO - 10.1111/1751-7915.13792
M3 - Article
C2 - 33710773
VL - 15
SP - 1189
EP - 1202
JO - Microbial Biotechnology
JF - Microbial Biotechnology
SN - 1751-7915
IS - 4
ER -
