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Kinetics for a membrane reactor reducing perchlorate.

Lokesh Padhye1, Ken Rainwater, W Andrew Jackson

  • 1Department of Civil Engineering, Texas Tech University, Lubbock, Texas 79409-1023, USA.

Water Environment Research : a Research Publication of the Water Environment Federation
|March 21, 2007
PubMed
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Autohydrogenotrophic bacteria efficiently removed perchlorate from water in a novel reactor, achieving 99% removal. However, sulfate-reducing bacteria growth posed a challenge to complete perchlorate degradation control.

Area of Science:

  • Environmental Microbiology
  • Water Treatment Technologies
  • Bioremediation

Background:

  • Perchlorate contamination poses risks to water resources.
  • Biological treatment offers a sustainable solution for perchlorate removal.

Purpose of the Study:

  • To construct and operate an autohydrogenotrophic reactor for perchlorate degradation.
  • To determine perchlorate degradation kinetics under specific conditions.

Main Methods:

  • Culturing autohydrogenotrophic bacteria in a constructed reactor.
  • Monitoring perchlorate and nitrate removal efficiencies.
  • Assessing the impact of hydraulic retention time and biomass concentration.
  • Investigating the influence of sulfate-reducing organisms.

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Main Results:

  • Achieved 99% perchlorate removal (3.6 mg/d), reducing influent concentration from 532 µg/L to 3 µg/L.
  • Established a first-order relationship between active biomass and hydraulic retention time.
  • Observed a perchlorate degradation rate of 1.62 hr⁻¹.
  • Simultaneously removed over 90% of nitrate.
  • Identified negative impacts of sulfate-reducing bacteria on perchlorate removal efficiency.

Conclusions:

  • Autohydrogenotrophic bioreactors are effective for perchlorate and nitrate removal.
  • Control over biological treatment, specifically managing sulfate-reducing bacteria, is crucial for optimal performance.
  • The study highlights the prevalence of perchlorate-reducing organisms in environmental samples.