2 points) Show your caa A 6.0 MGD water treatment plant is being planned that wi

Question

2 points) Show your caa A 6.0 MGD water treatment plant is being planned that will use a local river as its water The raw water characteristics of the river are shown in Table 1. source. Tracer studies done on the disinfection tank of a drinking water treatment plant after construction produced the plot shown in the figure below. To satisfy the surface water treatment rule for disinfection of Giardia (Table 2) on a day when the peak hourly flow rate is 5 MGD, the water temperature is 10°C and the pH is 7.0, the residual chlorine concentration (mg/L) needed is most nearly: r. NOTE: The chlorine dosage must not exceed 18 mg/L to minimize THM formation. A) 0.6 (C) 0.46 (D) 0.42 200 150 TIME, t10 100 CONTACT (min) Go 50 PEAK HOURLY FLOW RATE TABLE 1 Value Parameter Turbidity pH Alkalinity Calcium 17 NTU 6.8-7.1 S.U. 150 mg/L as CaCO 51 mg/L as CaCOs ure

Explanation / Answer

To calculate Residual chlorine(CT), we use Regression Equation as follows:

CT=(0.361*L)(-2.261+e^(2.46-0.073*T+0.125*C+0.389*pH)

Where, L=number of log inactivation for Giardia=[Slow sand data use from inactivation table]

T =temperatutre in celsius (10 0C)

C=chlorine residual in mg/L (1.8 mg/L)

pH =pH of water (7)

CT=(0.353*1)(12.006+e^(2.46-0.073*10+0.125*1.8+0.389*7)

=(0.353*-0.30)(13.28)

=0.6

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