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

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• Theoretical Detention Time (T) Calculation • 194,000 gal. ÷ 2,778 gpm = 69.83 minutes • Assumed Baffling Factor (T 10 /T) = 0.8 or 80 % • Theoretical Detention Time with T 10 /T • (194,000 gal x 0.8) ÷2,778 gpm = 55.87 minutes
Sample Time Actual Time CONTACT TIME TRACER STUDY ( CLEARWELL) Sodium Chloride Concentrations (µS/cm) Tracer Solution Conductivity C 0 Background Clearwell Influent Clearwell Effluent Clearwell Level: (Water Level @ Full) Background1 10:20 38.2 36.1 194000.0 Background2 10:25 38.1 34.4 Background3 10:30 39.0 33.5 Treatment Flow Rate (gpm) 0 HR 00 MIN 10:35 38.43 34.67 194,000.00 2,778 0 HR 10 MIN 10:45 114.5 34.8 194,000.00 0 HR 20 MIN 10:55 157.8 35.3 2,778 0 HR 30 MIN 11:05 159.0 38.4 194,000.00 0 HR 40 MIN 11:15 134.9 54.0 2,778 0 HR 50 MIN 11:25 177.0 72.1 194,000.00 1 HR 00 MIN 11:35 171.0 94.9 2,778 1 HR 10 MIN 11:45 154.3 112.1 194,000.00 1 HR 20 MIN 11:55 137.5 121.8 2,778 1 HR 30 MIN 12:05 148.3 130.1 1940,00.00 Average Clearwell Influent (including tracer): 150.48 uS/cm Average Clearwell Influent Background: 38.43 uS/cm Average Tracer Conductivity: (150.48-38.43) 112.04 uS/cm Average Clearwell Background effluent: 34.67 uS/cm Therefore 10% of C o = (112.04x0.1) 11.20 uS/cm Target Concentration for Clearwell Effluent (T 10) ) = (34.67+11.20) 45.87 uS/cm
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: Example -CT Calculation • Process
Page 21 and 22: • T 10 Calculation for the Clearw
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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