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Selenium reduction by a denitrifying consortium.

Rege1, Yonge, Mendoza

  • 1Center for Multiphase Environmental Research, Washington State University, Pullman, Washington 99164-2710.

Biotechnology and Bioengineering
|April 1, 1999
PubMed
Summary
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A wastewater bacterial consortium effectively reduces selenite and selenate after a lag period. Selenite reduction is four times faster than selenate reduction, showing potential for bioremediation.

Area of Science:

  • Environmental Microbiology
  • Bioremediation
  • Selenium Biogeochemistry

Background:

  • Wastewater treatment facilities can harbor microbial communities capable of contaminant reduction.
  • Selenium oxyanions, selenite and selenate, are common environmental contaminants requiring effective removal strategies.
  • Denitrifying conditions offer a promising environment for microbial selenium oxyanion reduction.

Purpose of the Study:

  • To investigate the ability of a denitrifying bacterial consortium from wastewater to reduce selenite and selenate.
  • To characterize the kinetics and conditions influencing selenium oxyanion reduction by this consortium.

Main Methods:

  • Enrichment of a denitrifying bacterial consortium from wastewater under specific growth conditions.
  • Experimental setup with acetate as carbon source and nitrate as electron acceptor.

Related Experiment Videos

  • Addition of selenite or selenate as contaminants and monitoring of their reduction alongside nitrate/nitrite.

    • Main Results:

    • A lag phase of approximately 150 hours was observed before significant selenite or selenate reduction commenced.
    • Nitrate and nitrite utilization occurred during the lag phase and concurrently with selenium oxyanion reduction.
    • Selenite reduction was approximately four times faster than selenate reduction at comparable biomass and contaminant concentrations.

    Conclusions:

    • The denitrifying bacterial consortium demonstrates the capacity for both selenite and selenate reduction.
    • Selenium oxyanion reduction is dependent on microbial biomass and contaminant concentration.
    • The faster rate of selenite reduction suggests differential microbial pathways or efficiencies for selenium oxyanion species.