Water chlorination contact tank

The customer

• Size: Large contractor
• Sector: Clean water industry
• Country: United Kingdom

The Project

• Size: 80-100 man-hours
• Duration: 2-3 weeks

The Problem

• Unknown amount of residual chlorine in the water stream
• Residence time and fluid age distributions unknown

Proposed solution

• Model fluid flow for different geometries
• Compute the residence time distribution (RTD)
• Estimate the amount of chlorine expected to leave the system for both geometries

The simulations

• Incompresible single phase steady state hydrodynamic simulation (CFD analysis)
• Transient simulation of the transport of a tracer species to characterize the performance (CFD analysis)
• Chlorine decay using the age of the fluid elements (CFD analysis)

Project overall results

• Optimised design (with screens) has proven to be significantly more efficient.
• Savings over £45,000 for the customer in prototyping and testing (estimate).
• Savings of more than 12 weeks in development time (estimate).