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Optimizing Nitrate Dosing Strategies for Sulfide Control Using Kinetic Modeling, Variance-Based Sensitivity Analysis,

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Summary
This summary is machine-generated.

Optimizing nitrate dosing in sewer systems significantly reduces harmful sulfide production. Strategic dosing in the third reactor achieved optimal sulfide removal with reduced costs and environmental impact.

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Area of Science:

  • Environmental Engineering
  • Environmental Microbiology
  • Water Quality Management

Background:

  • Sulfide and methane production in sewers causes odor, corrosion, and greenhouse gas emissions.
  • Effective mitigation strategies are crucial for operational efficiency and environmental protection.

Purpose of the Study:

  • To optimize nitrate dosing strategies for mitigating sulfide generation in sewer systems.
  • To evaluate the impact of dosing location and rate on sulfide and methane dynamics.

Main Methods:

  • Developed an extended kinetic model based on the WATS model to simulate sewer microbial processes.
  • Calibrated and validated the model using experimental data from a laboratory-scale sewer reactor.
  • Performed sensitivity analysis to identify key parameters influencing model predictions.

Main Results:

  • Nitrate dosing location and rate significantly impact sulfide removal and residual nitrate levels.
  • Optimal strategy involved dosing nitrate in the third reactor at 14.5 mgNO₃-N/L.
  • Achieved sulfide concentrations below 0.5 mgS/L with effluent nitrate at 0.9 mgNO₃-N/L, reducing costs by 42%.

Conclusions:

  • The study provides a quantitative basis for optimizing nitrate dosing in sewer networks.
  • Strategic nitrate dosing can effectively control sulfide production while minimizing costs and environmental impact.
  • Mathematical modeling is a valuable tool for understanding and optimizing wastewater treatment processes.