Influences of metals on kinetics of methyl tert-butyl ether biodegradation by Ochrobactrum cytisi.
The influence of zinc, manganese, and nickel on the degradation of MTBE (methyl tert-butyl ether), by an aerobic MTBE-degrading strain, Ochrobactrum cytisi, were investigated. The result showed that unlike previous findings, O. cytisi was able to degrade MTBE through direct metabolism when MTBE was present as the only carbon source. The degradation rate of MTBE was rapid, completed within 80 h. MTBE biodegradation by this strain was stimulated at low concentrations of Zn(2+) (1-5 mg l(-1)) and Mn(2+) (1-5 mg l(-1)) but inhibited at high concentrations of Zn(2+) (20 mg l(-1)) and Mn(2+) (20 mg l(-1)), and at low concentration of Ni(2+) (1-4 mg l(-1)). Kinetic parameters for MTBE degradation in the presence or absence of metals were obtained through nonlinear regression and a least-square minimization procedure. In all cases, a good agreement was achieved between kinetic simulations and experimental results.
Lin
Chi-Wen
CW
Department of Environmental Engineering, Da-Yeh University, 112 Shanjiao Road, Dacun, Changhua 51591, Taiwan, ROC. cwlin@mail.dyu.edu.tw
Cheng
Ya-Wen
YW
Tsai
Shen-Long
SL
D000332:Aerobiosis; D001673:Biodegradation, Environmental; D018533:Biomass; D007700:Kinetics; D019216:Metals, Heavy / Q000032:analysis* / Q000633:toxicity; D008738:Methyl Ethers / Q000032:analysis*; D042041:Ochrobactrum / Q000187:drug effects / Q000254:growth & development*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis* / Q000633:toxicity
D019216:Metals, Heavy; D008738:Methyl Ethers; D012989:Soil Pollutants; C043243:methyl tert-butyl ether