Testing the capacity of staphylococcus equorum for calcium and copper removal through MICP process

Sebastián Sepúlveda, Carla Duarte-Nass, Mariella Rivas, Laura Azócar, Andrés Ramírez, Javiera Toledo-Alarcón, Leopoldo Gutiérrez, David Jeison, Álvaro Torres-Aravena

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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.

Original languageEnglish
Article number905
JournalMinerals
Volume11
Issue number8
DOIs
StatePublished - Aug 2021
Externally publishedYes

Keywords

  • Calcium
  • Copper removal
  • Microbial-induced calcite precipitation (MICP)
  • Mining process water

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