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Advisor(s)
Abstract(s)
In this work we isolated from soil and
characterized several bacterial strains capable of
either resisting high concentrations of heavy metals
(Cd2+ or Hg2+ or Pb2+) or degrading the common
soil and groundwater pollutants MTBE (methyl-tertbutyl
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 metalresistant
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.
Description
Keywords
Bioremediation Soil Heavy metal TCE MTBE Cadmium Lead Mercury