Testing the Capacity of Staphylococcus equorum for Calcium and Copper Removal through MICP Process

Sepulveda, Sebastian; Duarte-Nass, Carla; Rivas, Mariella; Azocar, Laura; Ramirez, Andres; Toledo-Alarcon, Javiera; Gutierrez, Leopoldo; Jeison, David; Torres-Aravena, Alvaro

Abstract

This research focused on the evaluation of the potential use of a soil-isolated bacteria, identified as Staphylococcus equorum, for microbial-induced calcite precipitation (MICP) and copper removal. Isolated bacteria were characterized considering growth rate, urease activity, calcium carbonate precipitation, copper tolerance as minimum inhibitory concentration (MIC) and copper precipitation. Results were compared with Sporosarcina pasteurii, which is considered a model bacteria strain for MICP processes. The results indicated that the S. equorum strain had lower urease activity, calcium removal capacity and copper tolerance than the S. pasteurii strain. However, the culture conditions tested in this study did not consider the halophilic feature of the S. equorum, which could make it a promising bacterial strain to be applied in process water from mining operations when seawater is used as process water. On the other hand, copper removal was insufficient when applying any of the bacteria strains evaluated, most likely due to the formation of a copper-ammonia complex. Thus, the implementation of S. equorum for copper removal needs to be further studied, considering the optimization of culture conditions, which may promote better performance when considering calcium, copper or other metals precipitation.

Más información

Título según WOS: ID WOS:000690625400001 Not found in local WOS DB
Título de la Revista: MINERALs
Volumen: 11
Número: 8
Editorial: MDPI
Fecha de publicación: 2021
DOI:

10.3390/min11080905

Notas: ISI