Biooxidative action of biolixiving microbial crops on arsenopyrite

• Autores: Castillo Cotrina , Daladier Miguel, Castellanos Cabrera, Roberto, Tirado Rebaza, Ely
• Formato: artículo
• Fecha de Publicación: 2021
• Institución: Universidad Nacional Jorge Basadre Grohmann
• Repositorio: Revistas - Universidad Nacional Jorge Basadre Grohmann
• Lenguaje: español
• OAI Identifier: oai:revistas.unjbg.edu.pe:article/1108
• Enlace del recurso: https://revistas.unjbg.edu.pe/index.php/cyd/article/view/1108
• Nivel de acceso: acceso abierto
• Materia: Acidithiobacillus ferrooxidans,; Acidithiobacillus thiooxidans,; arsenopirita,; biooxidación; Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans; arsenopirirta; biooxidation

Arsenopyrite is a mineral source for the recovery of pure gold, biooxidation is used on it, a technology very little studied and applied in our country although it is low cost, efficient and friendly to the environment. The objective of this work was to evaluate the degree of biooxidation in two different concentrations of arsenopyrite by collection microbial cultures that were previously adapted to 1% arsenopyrite in the 0K culture medium. The arsenopyrite was sieved on a tyler sieve smaller than 200 and added in concentrations of 8 and 12% in the bioreactors containing 700 ml of fermentation medium (630 ml of sterilized culture medium with 70 ml of microbial inoculum).  The inoculum consisted of suspensions of a pure microbial culture medium one (two pure cultures). The incubation proceeded at room temperature for 288 hours with aeration. Microbial growth, pH, total iron, iron II, iron III, and biofilm formation on the arsenopyrite surface were evaluated. It was determined that the mixed microbial culture acting on 8% arsenopyrite produced the highest degree of biooxidatio corresponding to a production of 8197.7 mg L-1 of iron III.