Statewide (PA) Chlorine Contact Time Tracer Study - Gwin, Dobson ...

• Tracer studies are commonly used for reactor mixing characteristics and
actual detention times for treatment processes and unit operations
• A water system must determine the Contact Time (CT) of each disinfectant
sequence before the first customer to determine the total “inactivation” of
pathogens and viruses.
• Tracer studies allow characterization of system dynamics by:
• Demonstrate thoroughness of mixing chambers
• Determine path and time of travel in conduits
• Various methods and materials can be used to achieve evaluation
• Step Input Method
• Pulse Input Method
• Quantifiable Chemical Material
• Dye Material