Journal of Pure and Applied MicrobiologyVol. 7 No. 4

Effects of Temperature and pH on Fluoranthene Biodegradation Kinetics by the New Strain Rhodococcus baikonurensis BAP-1

Yi Li, Hongqi Wang*, Fei Hua, Mengyuan Su and Yicun Zhao

College of Water Sciences, Beijing Normal University, Beijing, China.

Received on 23 September 2013 and accepted on 06 November 2013

 

ABSTRACT

An indigenous biosurfactant-producing bacterium with effective fluoranthene-degrading ability was isolated from crude oil-contaminated soil, which was identified as Rhodococcus baikonurensis BAP-1. Michaelis-Menten equation was used to characterize the degradation kinetics, and the present investigation examines the effect of pH and temperature on fluoranthene biodegradation kinetics. Contact time, temperature, pH, salinity, and inoculum level were used as independence variables to optimize the degradation process.25 full factorial, central composite design together with response surface methodology (RSM) was used to determine the optimize experiments conditions of these parameters. Under optimum condition, Rhodococcus sp. BAP-1 exhibited 63.56% fluoranthene. Correlation coefficient (R2=0.976, p<0.01) indicated that empiric second-order polynomial model was adequate to predict. Meanwhile, lower temperature would decrease the activity of Rhodococcus sp. BAP-1 and cause lower biodegradation efficiency. Rhodococcus sp. BAP-1 would be more efficiency in biodegradation of fluoranthene under alkaline conditions. Hence, these results have significant implications be used to the bioremediationof PAHs contaminated environments.

Keywords : Rhodococcus sp.BAP-1, fluoranthene, biodegradation, pH, temperature, optimization.