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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria
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Assessing Intermediate Formation and Electron Competition during Thiosulfate-Driven Denitrification: An Experimental

Yan Yang1,2, Patricia Perez Calleja2, Yiwen Liu3

  • 1Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China.

Environmental Science & Technology
|August 3, 2022
PubMed
Summary

A new model predicts elemental sulfur formation during thiosulfate denitrification in wastewater. Continuous thiosulfate feeding optimizes electron competition, favoring symbiotic relationships between sulfur-oxidizing bacteria and anammox for efficient treatment.

Keywords:
branched pathwayelectron competitionelemental sulfurmodelingthiosulfate-driven denitrification

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

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Area of Science:

  • Environmental microbiology
  • Biogeochemical processes
  • Wastewater treatment technologies

Background:

  • Thiosulfate-driven denitrification is promising for low C/N wastewater treatment.
  • Thiosulfate oxidation pathways influence denitrification performance.
  • Elemental sulfur (S0) formation intensifies electron competition, hindering efficiency.

Purpose of the Study:

  • Develop a model to predict S0 formation and electron competition.
  • Investigate electron competition under various operating conditions.
  • Evaluate the model's integration with anammox processes.

Main Methods:

  • Developed the Indirect Coupling of Electrons (ICE) model.
  • Utilized kinetic data from sulfur-oxidizing bacteria (SOB) dominated by the branched pathway.
  • Calibrated and validated the model with experimental data.
  • Simulated electron competition under different conditions and integrated anammox.

Main Results:

  • The ICE model accurately predicts S0 formation and electron competition.
  • Electrons prioritize thiosulfate reduction, then nitrate, then nitrite reduction.
  • Continuous thiosulfate feeding alleviates electron competition and nitrite accumulation.
  • Nitrite accumulation supports anammox processes.

Conclusions:

  • The branched pathway and continuous thiosulfate supply favor SOB and anammox symbiosis.
  • The ICE model provides insights into optimizing thiosulfate-driven denitrification.
  • This approach enhances wastewater treatment efficiency and microbial interactions.