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

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• Data from the studies was summarized numerically and graphically • Graphical analysis was conducted to demonstrate residual concentration versus time to determine the detention time T 10
• T 10 Calculation for the Clearwell • Clearwell effluent conductivity + 10% Value of <strong>Tracer</strong> = Target T 10 Value • Target T 10 value = 34.67 us/cm + 11.20 us/cm = 45.87 us/cm • Theoretical DT values • 69.83 minutes • 55.87 minutes with assumed T 10 • T 10 /T Calculation • T 10 for the clearwell as derived from the concentration versus time profile = 35 minutes • T 10 /T = 35 ÷ 69.83 = 0.50 • QA/QC • 194,000 gal x 0.50 = 97,000 gal ÷2,778 gpm = 34.92 Thus the assumed or historical T 10 /T factor was to liberal and did not give an accurate representation of the true detention time and contact effective volume, thereby providing inaccurate log inactivation values.
Page 1 and 2: Prepared by: Travis J. Long, Senior
Page 3 and 4: • Gwin, Dobson & Foreman, Inc was
Page 5 and 6: • Tracer studies provide a means
Page 7 and 8: • Determine the desired flow rate
Page 9 and 10: Contact Tank Effluent Sample Locati
Page 11 and 12: • An important step in any tracer
Page 13 and 14: • Tracer Injection : • Injectio
Page 15 and 16: Solution feed tank and variable spe
Page 17 and 18: Example -CT Calculation • Process
Page 19: Sample Time Actual Time CONTACT TIM
Page 23 and 24: EPA Table E-3 CT Values for Inactiv
Page 25 and 26: Chlorine Residual (mg/l) Tabulated
Page 27 and 28: Water Treatment Facility Daily Log
Page 29 and 30: • The purpose of baffling is to m
Page 31 and 32: Unbaffled Mixing Conditions (rectan
Page 33 and 34: Average Baffling Conditions (rectan
Page 35 and 36: Superior Baffling Conditions (recta
Page 37 and 38: The following table summarizes the
Page 39 and 40: • The PADEP state‐wide tracer s
Page 41: Questions

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

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