A potable water containing 104 CFU/100 ml of total Coliform will be disinfected using calcium hypochlorite Ca(OCI)2. The change of chlorine concentration by time for this potable water is given in Figure below. For the potable water, the inactivation of total coliform by chlorine obeys to Chick-Watson Law with n = 1 and k = 0.075 L/mg.min. The daily flow rate of water to be disinfected is 15000 m³/d. Design a chlorine disinfection tank with specifying dimensions based on a suitable contact time and determine initial and residual chlorine concentrations for 99.9% of disinfection efficiency. Finally, calculate daily amount of calcium hypochlorite required as kg/d for this disinfection process. Note that residual chlorine concentration should be greater than 0.75 mg/L. 2,5 Chlorine dose (mg/L) 2 15 0,5 0 0 10 20 30 40 Time (min) 50 60 70

A potable water containing 104 CFU/100 ml of total Coliform will be disinfected using calcium hypochlorite Ca(OCI)2. The change of chlorine concentration by time for this potable water is given in Figure below. For the potable water, the inactivation of total coliform by chlorine obeys to Chick-Watson Law with n = 1 and k = 0.075 L/mg.min. The daily flow rate of water to be disinfected is 15000 m³/d. Design a chlorine disinfection tank with specifying dimensions based on a suitable contact time and determine initial and residual chlorine concentrations for 99.9% of disinfection efficiency. Finally, calculate daily amount of calcium hypochlorite required as kg/d for this disinfection process. Note that residual chlorine concentration should be greater than 0.75 mg/L. 2,5 Chlorine dose (mg/L) 2 15 0,5 0 0 10 20 30 40 Time (min) 50 60 70

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

100%

A potable water containing 104 CFU/100 ml of total Coliform will be disinfected using calcium
hypochlorite Ca(OCI)2. The change of chlorine concentration by time for this potable water is given in Figure
below. For the potable water, the inactivation of total coliform by chlorine obeys to Chick-Watson Law with
n = 1 and k = 0.075 L/mg.min. The daily flow rate of water to be disinfected is 15000 m³/d. Design a
chlorine disinfection tank with specifying dimensions based on a suitable contact time and determine initial
and residual chlorine concentrations for 99.9% of disinfection efficiency. Finally, calculate daily amount of
calcium hypochlorite required as kg/d for this disinfection process. Note that residual chlorine
concentration should be greater than 0.75 mg/L.
2,5
Chlorine dose (mg/L)
2
15
0,5
0
0
10
20
30
40
Time (min)
50
60
70

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