Response surface optimization of dissolved oxygen and nitrogen sources for the biodegradation of MTBE and BTEX

Lin, Chi-Wen; Yen, Chia-Hsien; Lin, Hongjun; Tran, Dang-Thuan

Response surface optimization of dissolved oxygen and nitrogen sources for the biodegradation of MTBE and BTEX

2010

Lin, Chi-Wen | Yen, Chia-Hsien | Lin, Hongjun | Tran, Dang-Thuan

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, N², DO and DO² 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 × N has no significant effect on the degradation processes.

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