Aerobic co-metabolism of 1,1,2,2-tetrachloroethane by Rhodococcus aetherivorans TPA grown on propane: kinetic study and bioreactor configuration analysis

作者：Cappelletti Martina^*; Pinelli Davide; Fedi Stefano; Zannoni Davide; Frascari Dario

来源：Journal of Chemical Technology and Biotechnology, 2018, 93(1): 155-165.

DOI：10.1002/jctb.5335

• tetrachloroethane
• biodegradation
• aerobic co-metabolism
• Rhodococcus aetherivorans
• modelling
• bioreactor configuration
• full-scale process simulation

BACKGROUND1,1,2,2-tetrachloroethane (TeCA) has been generally considered as non-biodegradable under aerobic conditions, while its complete biodegradation was reported with microbial consortia growing anaerobically. This study describes TeCA aerobic co-metabolic degradation by the propanotroph Rhodococcus aetherivorans strain TPA isolated from a TeCA-degrading consortium.
RESULTSR. aetherivorans TPA was able to grow on aliphatic hydrocarbons from propane to pentane and on gaseous n-alkane metabolic intermediates. The Michaelis-Menten model allowed a satisfactory fit of the TPA propane utilization rates under resting cell conditions, while the TeCA degradation rates were successfully interpolated with Andrew's inhibition model. A significant propane-TeCA mutual inhibition was observed, although the results did not allow distinguishing between competitive and non-competitive inhibition. Among different bioreactor options for the on-site bioremediation of TeCA-contaminated groundwater, a single suspended-cell continuous stirred-tank reactor (CSTR) appeared to be the optimal one.
CONCLUSIONSThis study provides for the first time the kinetic and microbiological characterization of a bacterial strain capable of degrading TeCA under aerobic conditions.

• 出版日期2018-1