A clearwell tracer study was performed to determine T10 of the Manchester Water Department Clearwell. The flow rate was 5.6 MGD and the volume of the clearwell was 49,650 ft3. The results were the following: Figure 1-1. Clearwell Tracer Study Results

(a) What is T10? Show how you determined this value.

(b) The Manchester Water Department has a conventional treatment plant (sedimentation and filtration) and uses free chlorine for disinfection at pH 6.0. What is the effluent chlorine concentration required for inactivation of Giardia lamblia cysts at 5?C?

(c) What would be the effluent chlorine concentration be if the clearwell was an ideal plug flow reactor?

(d) Is the disinfection efficiency of chlorine a function of pH? Explain.

Transcribed Image Text:

1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 25 50 75 100 125 150 175 200 225 250 275 300 Time (min) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 25 50 75 100 125 150 175 200 225 250 275 300 Time (min)

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a What is T10 Show how you determined this value ans T10 is define as time require to pass 10 of tot... View the full answer