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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A Fed-Batch Strategy Integrated with Mechanical Activation Improves the Solubilization of Phosphate Rock by Aspergillus niger

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Author(s):
Klaic, Rodrigo [1, 2] ; Plotegher, Fabio [1] ; Ribeiro, Caue [1, 3] ; Zangirolami, Teresa C. [2] ; Farinas, Cristiane S. [1, 2]
Total Authors: 5
Affiliation:
[1] Embrapa Instrumentacao, Rua 15 Novembro, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Grad Program Chem Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Fed Sao Carlos, Grad Program Chem, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 6, n. 9, p. 11326-11334, SEP 2018.
Web of Science Citations: 1
Abstract

Solubilization of phosphate rock (PR) by microorganisms is an environmentally sustainable alternative to chemical processing for production of phosphate fertilizers. The effectiveness of this PR biological solubilization process is driven by the microbial production of organic acids that chelate the cations (mainly calcium) bound to phosphate. However, the biological solubilization efficiency has been limited by the PR solids content of cultivation systems and is still low for practical applications. Here, we propose a fed batch strategy coupled with mechanical activation to improve the biological solubilization of PR by Aspergillus niger. An initial systematic study of the effect of the particle size of Itafos phosphate rock (IPR), a low reactivity phosphate mineral (P2O5, 20%), on the biological solubilization of phosphorus revealed that the particle size played a key role in IPR solubilization. Increases of available phosphate of up to 57% under submerged cultivation and 45% for solid-state culture were observed for rocks that had been milled for only 10 min. A fed-batch procedure was proposed in order to increase the solids content while maintaining the P-solubilization efficiency, resulting in a remarkable increase of 78% in P-solubilization, compared to the conventional process. This proposed strategy could potentially contribute to the future development of biotechnological processes for the large-scale industrial production of phosphate fertilizers that are environmentally sustainable. (AU)

FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
Grantee:Roberto de Campos Giordano
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 17/11149-6 - Development of nanocomposites based on elemental sulfur for conveying micronutrients to soil
Grantee:Fábio Plotegher
Support Opportunities: Scholarships in Brazil - Innovative Research in Small Business - PIPE