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Modeling Nicotine-Induced Chlorine Loss in Drinking Water Using Updated EPANET-MSX.

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  • 1Environmental Engineer, Office of Research and Development, US Environmental Protection Agency, 26 Martin Luther King Dr. West, MS689, Cincinnati, OH 45268.

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Summary

This study modeled nicotine's impact on chlorine loss in drinking water using EPANET-MSX. The best model included a reactive intermediate and dispersion, improving agreement with experimental data.

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Area of Science:

  • Environmental Engineering
  • Water Quality Management
  • Chemical Kinetics

Background:

  • Multispecies water quality modeling is essential for understanding chemical reactions in drinking water distribution systems.
  • Previous models lacked detailed simulation of complex reactions like nicotine-chlorine interactions.

Purpose of the Study:

  • To simulate and analyze nicotine-associated chlorine loss in drinking water using an updated EPANET multi-species eXtension (EPANET-MSX).
  • To compare model performance with experimental data (bottle tests and test injections).
  • To evaluate the impact of a reactive intermediate and dispersion on model accuracy.

Main Methods:

  • Utilized an updated EPANET-MSX (version 2.2-compatible) incorporating dispersion and enhanced mass balance reporting.
  • Developed an automated Python script for data processing, model execution, and results analysis.
  • Compared two reaction models: one with and one without a reactive intermediate nicotine species.

Main Results:

  • The model incorporating a reactive intermediate nicotine species and dispersion demonstrated the best agreement with experimental data.
  • EPANET-MSX successfully simulated the nicotine-chlorine reaction, highlighting its new features.
  • The study confirmed nicotine's role in chlorine loss, initially explored from a drinking water security perspective.

Conclusions:

  • The inclusion of a reactive intermediate and dispersion significantly improves the accuracy of water quality models for reactions like nicotine-chlorine loss.
  • EPANET-MSX, with its advanced features, is a valuable tool for simulating complex chemical processes in drinking water systems.
  • This research provides a practical demonstration of EPANET-MSX capabilities in real-world water quality scenarios.