Abstract
Heavy metal resistance (Cu, Zn, Fe, Cr, Pb, Cd) and removal capacities of 19 selected actinobacteria strains were performed in order to investigate their applicability as bioremediators for polluted areas. Streptomyces sp. WR1L1S8 was used in the present investigation as heavy metals removing strain, which was isolated from inner tissu of the marine brown algae Fucus sp., and identified based on polyphasic and molecular characterization.The results showed that WR1L1S8 could successfully remove Fe2+, Cu2+ and Zn2+ by 60.74%, 42% and 39.02%, respectively, using Atomic Absorption Spectroscopy (AAS) analysis. The strain WR1L1S8 had a considerable tolerance to initial Cu2+ with a minimum inhibitory concentration value recorded at 250 mg L−1. Rotatable Central Composite Design (CCD) was used to optimize the copper removal yield using nutrient broth in batch experiment studying the influence of four operating parameters: incubation time, stirring speed, inoculum size and percentage of seawater. The optimal conditions were found at incubation time of 9 days under 114.9 rpm of a stirring speed, 18 agar cylinders as inoculum and 80.75% of seawater reaching a removal capacity of 75.24% which correspond to 29.65% increase compared with the non-optimized conditions. WR1L1S8 exhibited a promising potential for copper removal from aqueous solutions.
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