Bioremediation of Cu with the Endophytic Bacteria Bacillus sp. and Streptomyces griseus

Abstract

Abstract In this study, the acute toxic effect of copper on organisms was determined with the use of two bacterial species Bacillus sp. and Streptomyces griseus. After 4 days of acute toxicity test, changes in metal and bacteria concentration in water, inhibition (%), bioaccumulation rate and bioconcentration factor were evaluated in terms of toxicology. Cell weights decreased and inhibition rates (%) increased with increasing metal concentrations after a certain level (10 mg L-1 Cu). With increasing metal concentrations from 5 to 25 mg L-1, % biosorption decreased from 35.94 to 20.73 for S. griseus and from 56.36 to 34.47 for Bacillus sp. The bioaccumulation quantities increased with increasing metal concentrations for both species. Bacillus sp. and S. griseus are suitable candidates for bioremediation of copper ions from the contaminated environment.