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

Autor(es)

Klaic, Rodrigo ^{[1, 2]} ; Plotegher, Fabio ^[1] ; Ribeiro, Caue ^{[1, 3]} ; Zangirolami, Teresa C. ^[2] ; Farinas, Cristiane S. ^{[1, 2]}

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 6, n. 9, p. 11326-11334, SEP 2018.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 16/10636-8 - Da fábrica celular à biorrefinaria integrada Biodiesel-Bioetanol: uma abordagem sistêmica aplicada a problemas complexos em micro e macroescalas
• Beneficiário: Roberto de Campos Giordano
• Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 17/11149-6 - Desenvolvimento de nanocompósitos à base de enxofre elementar para veiculação de micronutrientes em solo
• Beneficiário: Fábio Plotegher
• Linha de fomento: Bolsas no Brasil - Pesquisa Inovativa em Pequenas Empresas - PIPE