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Characteristic hydrogen concentrations for various redox processes in batch study.

X X Lu1, S Tao, T Bosma

  • 1Peking University, Beijing, PR China. Luxx@mail.tsinghua.edu.cn

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|November 2, 2001
PubMed
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Dissolved hydrogen concentrations reveal distinct redox process thresholds. Chloroethene dechlorination thresholds vary, aligning with specific microbial processes like sulfate reduction and methanogenesis.

Area of Science:

  • Environmental Microbiology
  • Geochemistry
  • Bioremediation

Background:

  • Dissolved hydrogen is a key indicator in microbial redox processes.
  • Understanding hydrogen thresholds is crucial for chloroethene degradation.
  • Various electron acceptors and donors influence redox conditions.

Purpose of the Study:

  • To investigate dissolved hydrogen concentrations under different redox conditions.
  • To determine characteristic hydrogen threshold values for chloroethene degradation.
  • To correlate hydrogen levels with specific microbial redox processes.

Main Methods:

  • Batch experiments were conducted using chloroethenes (PCE, cis-DCE, VC) as substrates.
  • Addition of various electron acceptors (nitrate, manganese oxide, ferric iron, sulfate) and donors.

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  • Monitoring of hydrogen concentrations and redox species over time.

    • Main Results:

    • Redox processes using nitrate, manganese oxide, and ferric iron showed hydrogen thresholds near PCE/TCE dechlorination.
    • cis-DCE dechlorination aligned with sulfate reduction thresholds.
    • VC dechlorination correlated with methanogenesis thresholds.
    • Specific hydrogen concentration ranges were identified for each redox process.

    Conclusions:

    • Dissolved hydrogen concentrations serve as valuable indicators for specific redox processes.
    • Thresholds of dissolved hydrogen can differentiate between various chloroethene degradation pathways.
    • This research provides insights into microbial reductive dechlorination under diverse environmental conditions.