Journal of Pure and Applied MicrobiologyVol. 1 No. 2

Impact of heavy metals on biodegradation of phenanthrene by Cellulomonas hominis strain N2

R.M. Hegazi1, N.Sh. El-Gendy1*, A.A. El-Feky1, Y.M. Moustafa1, S.El- Ezbewy2 and G.H. El-Gemaee2

šEgyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt. ˛Faculty of Science, Helwan University, Helwan, Egypt.

Received on 15 June 2007 and accepted on 03 August 2007

 

ABSTRACT

Effects of some heavy metals (HM) namely, Cu, Mn, Ni and Zn, individually and in mixture on the biodegradation of phenanthrene (Phe) as a model for polyaromatic petroleum hydrocarbons (PAHs) using Cellulomonas hominis N2 previously isolated from highly heavy metals and petroleum contaminated soil (PCS) were studied. The bacterial growth showed a decrease in the surface tension of the incubated culture in addition to good emulsification index which proves that Cellulomonas hominis N2 is biosurfactant producer. Cellulomonas hominis N2 showed good growth and biodegradation potentials on Phe in absence and presence of heavy metals with various degrees depending on the type and concentration of the metal either being present individually or as a mixture. The biodegradation potential was found to be not linearly related to growth rates.

Keywords : Impact, Heavy metals, Biodegradation, Phenanthrene, and Cellulomonas hominis.