Influence of metal ions concentration on phenol degradation by Rhodococcus pyridinivorans GM3


Phenol is discharged in large quantities to in the environment, and because of its persistence andhigh toxicity, can be a potential threat to human health; therefore, biodegradation be recognized as a bestway for removing phenol from the environment. Industrial water is often polluted with metal ions, whichmay effect on phenol degradation. Some metal ions are useful for microorganisms but other metal ions mayhave toxic effects, perhaps increased metal ions in wastewater have negative impact on microorganisms.Phenol degrading bacterium was isolated from soil samples by enrichment method and has been identifiedas Rhodococcus pyridinivorans GM3. Rhodococcus pyridinivorans was studied to degrade phenol (1.5and 2.0 g/L concentrations of phenol) with different concentrations of 19 different metal ions. The resultsshowed that R. pyridinivorans GM3 was degraded phenol on concentrations 1.5 and 2.0 g/L at 150 ppm 2+ 5– 2+ + 2+ 2+ 2+ 2+ 2+concentrations of Ba , As and Pb , while metal ions Ag >Cd >Hg >Zn >Cu >Co have inhibited degradation of phenol (2.0 g/L concentration) was observed. The results clearly indicated that R. pyridinivorans GM3 can degrade phenol with many of metal ions and has may be employed for degradation of phenol in industrial wastewaters that are contaminated with metal ions.