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. 1994 Feb;60(2):542–548. doi: 10.1128/aem.60.2.542-548.1994

Aerobic Mineralization of Trichloroethylene, Vinyl Chloride, and Aromatic Compounds by Rhodococcus Species

K J Malachowsky 1,2, T J Phelps 1,3,*, A B Teboli 4, D E Minnikin 4, D C White 1,2,3
PMCID: PMC201346  PMID: 16349184

Abstract

Two Rhodococcus strains which were isolated from a trichloroethylene (TCE)-degrading bacterial mixture and Rhodococcus rhodochrous ATCC 21197 mineralized vinyl chloride (VC) and TCE. Greater than 99.9% of a 1-mg/liter concentration of VC was degraded by cell suspensions. [1,2-14C]VC was degraded by cell suspensions, with the production of greater than 66% 14CO2 and 20% 14C-aqueous phase products and incorporation of 10% of the 14C into the biomass. Cultures that utilized propane as a substrate were able to mineralize greater than 28% of [1,2-14C]TCE to 14CO2, with approximately 40% appearing in 14C-aqueous phase products and another 10% of 14C incorporated into the biomass. VC degradation was oxygen dependent and occurred at a pH range of 5 to 10 and temperatures of 4 to 35°C. Cell suspensions degraded up to 5 mg of TCE per liter and up to 40 mg of VC per liter. Propane competitively inhibited TCE degradation. Resting cell suspensions also degraded other chlorinated aliphatic hydrocarbons, such as chloroform, 1,1-dichloroethylene, and 1,1,1-trichloroethane. The isolates degraded a mixture of aromatic and chlorinated aliphatic solvents and utilized benzene, toluene, sodium benzoate, naphthalene, biphenyl, and n-alkanes ranging in size from propane to hexadecane as carbon and energy sources. The environmental isolates appeared more catabolically versatile than R. rhodochrous ATCC 21197. The data report that environmental isolates of Rhodococcus species and R. rhodochrous ATCC 21197 have the potential to degrade TCE and VC in addition to a variety of aromatic and chlorinated aliphatic compounds either individually or in mixtures.

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Selected References

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