Rock phosphate solubilization by abiotic and fungal-produced oxalic acid: reaction parameters and bioleaching potential.

Autor: Mendes GO; Laboratório de Microbiologia e Fitopatologia, Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Rod. LMG-746, km 1, Bloco 1A-MC, Sala 315, Monte Carmelo, MG, 38500-000, Brazil.; Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK., Dyer T; Concrete Technology Group, Department of Civil Engineering, University of Dundee, Dundee, DD1 4HN, UK., Csetenyi L; Concrete Technology Group, Department of Civil Engineering, University of Dundee, Dundee, DD1 4HN, UK., Gadd GM; Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK.; State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil and Gas Pollution Control, Department of Environmental Science and Engineering, College of Chemical Engineering and Environment, China University of Petroleum, 18 Fuxue Road, Changping District, Beijing, 102249, China.
Jazyk: angličtina
Zdroj: Microbial biotechnology [Microb Biotechnol] 2022 Apr; Vol. 15 (4), pp. 1189-1202. Date of Electronic Publication: 2021 Mar 12.
DOI: 10.1111/1751-7915.13792
Abstrakt: 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.
(© 2021 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology.)
Databáze: MEDLINE
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