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  • Title: Dual augmentation for aerobic bioremediation of MTBE and TCE pollution in heavy metal-contaminated soil.
    Author: Fernandes VC, Albergaria JT, Oliva-Teles T, Delerue-Matos C, De Marco P.
    Journal: Biodegradation; 2009 Jun; 20(3):375-82. PubMed ID: 18987783.
    Abstract:
    In this work we isolated from soil and characterized several bacterial strains capable of either resisting high concentrations of heavy metals (Cd(2+) or Hg(2+) or Pb(2+)) or degrading the common soil and groundwater pollutants MTBE (methyl-tert-butyl ether) or TCE (trichloroethylene). We then used soil microcosms exposed to MTBE (50 mg/l) or TCE (50 mg/l) in the presence of one heavy metal (Cd 10 ppm or Hg 5 ppm or Pb 50 or 100 ppm) and two bacterial isolates at a time, a degrader plus a metal-resistant strain. Some of these two-membered consortia showed degradation efficiencies well higher (49-182% higher) than those expected under the conditions employed, demonstrating the occurrence of a synergetic relationship between the strains used. Our results show the efficacy of the dual augmentation strategy for MTBE and TCE bioremediation in the presence of heavy metals.
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