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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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[Nitrite denitrification characteristics with redox mediator].

Li-jun Zhao1, Zhi-yuan Ma, Yan-kai Guo

  • 1School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiashuang 050018, China. zlj2009good@163.com

Huan Jing Ke Xue= Huanjing Kexue
|December 3, 2013
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Summary

This study optimized nitrite biodegradation using redox mediators and bacteria. Optimal conditions were identified for efficient nitrite removal, enhancing bioremediation strategies.

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Area of Science:

  • Environmental Microbiology
  • Bioremediation
  • Biochemical Engineering

Background:

  • Nitrite accumulation poses environmental risks.
  • Efficient biological nitrite degradation is crucial for water quality.
  • Redox mediators can enhance microbial denitrification processes.

Purpose of the Study:

  • To optimize conditions for nitrite biodegradation using redox mediators and denitrifying bacteria.
  • To investigate the characteristics of nitrite degradation under optimized conditions.
  • To elucidate the role of Anthraquinone-2-sulfonic acid (AQS) in the denitrification process.

Main Methods:

  • Optimization of parameters including temperature, pH, carbon source, C/N ratio, initial nitrite concentration, and AQS concentration.
  • Monitoring of Oxidation-Reduction Potential (ORP) and pH during denitrification.
  • Analysis of denitrifying intermediate metabolites to understand the mechanism of AQS action.

Main Results:

  • Optimal conditions: 35°C, pH 8.0, sodium succinate, C/N ratio of 4, initial nitrite 100 mg/L, and AQS 0.16 mmol/L.
  • AQS addition resulted in lower ORP values (-400 to -500 mV) compared to controls.
  • pH increased to 9-10 during nitrite removal.
  • AQS likely acts as a coenzyme and accelerates electron transfer in cytochrome.

Conclusions:

  • Established optimal parameters for practical application of nitrite biodegradation with redox mediators.
  • Demonstrated the efficacy of AQS in enhancing nitrite denitrification.
  • Provided insights into the biochemical mechanisms of redox-mediated denitrification.