Kinetics of the aerobic co-metabolism of 1,1-dichloroethylene by Achromobacter sp.: a novel benzene-grown culture |
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Authors: | Shizong Wang Qi Yang Luning Zhang Yeyao Wang |
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Institution: | 1. School of Water Resources and Environment, China University of Geosciences, Beijing, 100083, People’s Republic of China 2. China National Environmental Monitoring Centre, Beijing, 100012, People’s Republic of China
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Abstract: | Batch experiments were performed for the aerobic co-metabolism of 1,1-dichloroethylene (1,1-DCE) by Achromobacter sp., identified by gene sequencing of 16S rRNA and grown on benzene. Kinetic models were employed to simulate the co-metabolic degradation of 1,1-DCE, and relevant parameters were obtained by non-linear least squares regression. Benzene at 90 mg L?1 non-competitively inhibited degradation of 1,1-DCE (from 125 to 1,200 μg L?1). The maximum specific utilization (kc) rate and the half-saturation constant (Kc) for 1,1-DCE were 54 ± 0.85 μg h?1 and 220 ± 6.8 μg L?1, respectively; the kb and Kb for benzene were 13 ± 0.18 mg h?1 and 28 ± 0.42 mg L?1, respectively. This study provides a theoretical basis to predict the natural attenuation when benzene and 1,1-DCE occur as co-contaminants. |
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