Isolation, enrichment and screening of Cr⁶⁺ tolerant bacterium from coalmine area.

Optimization of nutrients, carbon source, pH, temperature and oxygen availability.

Cr⁶⁺ removal estimation of the bacterium from single and bimetallic solutions.

Derivation and validation of the metal removal mechanism with Monod's equation.

Molecular characterization identified the bacterium as Rhodococcous erythropolis.