A new approximate solution for chlorine concentration decay in pipes.

Area of Science:

• Environmental Engineering
• Water Treatment
• Fluid Dynamics

Background:

• Previous models for chlorine decay in pipes had limitations, particularly with large wall decay parameters.
• Accurate modeling of chlorine transport is crucial for maintaining water quality in distribution systems.

Purpose of the Study:

• To develop a more accurate approximate solution for the 2-D steady-state chlorine transport equation under turbulent flow.
• To introduce a methodology combining simulated annealing with the new solution for determining pipe wall decay parameters.

Main Methods:

• Developed a novel approximate solution for the 2-D steady-state chlorine transport equation.
• Integrated simulated annealing with the new approximate solution to estimate the wall decay parameter.
• Validated the solution using experimental data and applied it to a pipe network scenario.

Main Results:

• The new approximate solution demonstrates improved accuracy and ease of evaluation compared to existing methods.
• The combined methodology effectively determines the wall decay parameter in pipe systems.
• Successful simulation of chlorine decay using experimental data from Rossman (2006).

Conclusions:

• The proposed approximate solution offers a significant advancement in modeling chlorine decay in pipes.
• The simulated annealing-based methodology provides a robust tool for assessing wall consumption in water distribution networks.
• This work contributes to better water quality management in pipe systems.