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Relationship between chlorine decay and temperature in the drinking water
Fernando García-Ávila1, Carlos Sánchez-Alvarracín1, Manuel Cadme-Galabay2
1Facultad de Ciencias Químicas, Universidad de Cuenca, Postal address 010107, Cuenca, Ecuador.
Methodsx
|August 11, 2020
Summary
This study presents a method to determine chlorine decay kinetics in drinking water, finding that temperature significantly impacts the bulk reaction rate constant (Kb). Understanding this is crucial for maintaining water quality in distribution systems.
Area of Science:
- Environmental Chemistry
- Water Treatment Engineering
Background:
- Bulk chlorine decay is a critical factor in drinking water quality.
- Temperature is a known influencer on chlorine decay rates in water supply systems.
Purpose of the Study:
- To present a method for determining the reaction kinetic order of chlorine with drinking water.
- To provide a method for estimating the bulk reaction rate constant (Kb).
- To evaluate the impact of temperature on residual chlorine decomposition in distribution networks.
Main Methods:
- Experimental analysis of free residual chlorine concentrations over time.
- Modeling chlorine decay using graphed concentration-time data.
- Kinetic analysis to determine reaction order and rate constants.
Main Results:
- The average mass decomposition rate of chlorine was determined to be 0.15 h⁻¹.
- A direct correlation was observed between increasing temperature and increased Kb.
- The developed method effectively models residual chlorine decomposition as a function of temperature.
Conclusions:
- The study successfully established a method to determine chlorine reaction kinetics and Kb.
- Temperature is a significant variable affecting chlorine decay in drinking water.
- The findings aid in optimizing residual chlorine management in water distribution systems.
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