Keywords
heavy metals
refinery effluent bacteria
How to Cite
Abstract
Bacterial isolates from petroleum refinery effluent were evaluated for growth in increasing doses of phenol and heavy metal ions. All the test organisms were able to grow in mineral salt medium with phenol concentration of 15.0 mM (≈ 1412.0 mg/l) except Pseudomonas sp. RBD3. Aeromonas sp. RBD4, Staphylococcus sp. RBD5 and Pseudomonas sp. RBD10 showed the highest tolerance to 15.0 mM of phenol followed by Corynebacterium sp. RBD7 while Escherichia coli RBD2 and Citrobacter sp. RBD8 showed the least tolerance to 15.0 mM of phenol. The minimum inhibitory concentrations (MICs) ranged from 1.0 mM for mercury and 4.5 mM for chromium, nickel, lead and copper. The bacterial strains were most susceptible to mercury toxicity. Viable counts of the organism on mineral salt-phenol agar showed a typical growth pattern for inhibitory substrate. The threshold concentration is 0.5 mM for Bacillus sp. RBD1, Escherichia coli RBD2, Bacillus sp. RBD6, Citrobacter sp. RBD8, Streptococcus sp. RBD9, Pseudomonas sp. RBD11 and Escherichia coli RBD12 and 1.0 mM for Pseudomonas sp. RBD3, Aeromonas sp. RBD4, Staphylococcus sp. RBD5, Corynebacterium sp. RBD7 and Corynebacterium sp. RBD10. The results suggest that microorganisms isolated from petroleum refinery effluent are potentially useful for detoxification of phenol impacted systems in the presence of heavy metals.
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