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Evaluating simultaneous chromate and nitrate reduction during microbial denitrification processes.

Lai Peng1, Yiwen Liu2, Shu-Hong Gao2

  • 1Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, Queensland, 4072, Australia; Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, 9000, Ghent, Belgium.

Water Research
|December 1, 2015
PubMed
Summary
This summary is machine-generated.

A mathematical model evaluated microbial interactions for simultaneous nitrate and chromate removal. Mixotrophic conditions favored coexistence, with sulfur-oxidizing bacteria contributing significantly to contaminant reduction.

Keywords:
Chromate (Cr (VI))Heterotrophic denitrificationMathematical modelMixotrophic conditionsNitrate (NO(3)(−))Sulfur-based autotrophic denitrification

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Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Mathematical modeling

Background:

  • Nitrate and chromate are common water contaminants.
  • Autotrophic and heterotrophic denitrification are promising removal technologies.
  • Biofilm systems offer potential for simultaneous contaminant removal.

Purpose of the Study:

  • Develop a mathematical model for microbial and substrate interactions in biofilm systems.
  • Evaluate simultaneous nitrate and chromate removal under different conditions.
  • Investigate the role of mixotrophic denitrification and hydraulic retention time (HRT).

Main Methods:

  • Mathematical modeling of microbial and substrate dynamics.
  • Experimental validation using three independent biofilm reactors.
  • Analysis of autotrophic, heterotrophic, and mixotrophic conditions.

Main Results:

  • The model accurately described nitrate, chromate, methanol, and sulfate dynamics.
  • Mixotrophic conditions supported coexistence of sulfur-oxidizing and heterotrophic denitrifiers.
  • Chromate-reducing bacteria were outcompeted, but sulfur-oxidizing bacteria contributed significantly to reduction.
  • Higher HRT (>0.15 day) was critical for over 90% nitrate and chromate removal.
  • Mixotrophic denitrification enhanced tolerance to chromate toxicity.

Conclusions:

  • Mathematical modeling is effective for understanding complex microbial interactions in bioremediation.
  • Mixotrophic denitrification offers advantages for simultaneous nitrate and chromate removal.
  • Optimized HRT is crucial for efficient performance of biofilm systems.