Response surface optimization of dissolved oxygen and nitrogen sources for the biodegradation of MTBE and BTEX.
Response surface methodology (RSM) using central composite design was applied to obtain the optimal dissolved oxygen (DO) and nitrogen (N) concentrations for biodegrading MTBE (Methyl tert-butyl ether) and BTEX (benzene, ethylbenzene, toluene, p-xylene). Moreover, the effects of DO, N, and their interaction on the degradation process were evaluated. It was found that N, N(2), DO and DO(2) have significant effects on the efficiency of MTBE and BTEX removal. The removal efficiency when using biostimulation with bioaugmentation (BwB) is higher than with other processes, being greater than 82% at concentrations of 12 and 48 mg l(-1) for DO and N, respectively. However, it was also found that the interaction term of DO x N has no significant effect on the degradation processes.
Lin
Chi-Wen
CW
Department of Safety Health and Environmental Engineering, National Yunlin University of Science and Technology, 123 University Rd. Sec. 3, Douliou, Yunlin 64002, Taiwan, ROC. Linwen@yuntech.edu.tw
Yen
Chia-Hsien
CH
Lin
Hung-Chun
HC
Tran
Dang-Thuan
DT
D001554:Benzene / Q000378:metabolism*; D001555:Benzene Derivatives / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D004526:Efficiency; D008738:Methyl Ethers / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D011549:Pseudomonas / Q000378:metabolism; D014050:Toluene / Q000378:metabolism; D014992:Xylenes / Q000378:metabolism
D001555:Benzene Derivatives; D008738:Methyl Ethers; D014992:Xylenes; C043243:methyl tert-butyl ether; D014050:Toluene; D001554:Benzene; C004912:ethylbenzene; D009584:Nitrogen; D010100:Oxygen