Ấn unfiltered water supply is disinfected with an applied chlorine dose of 2 mg L as Clh. Thepeak hourly flow is 0.05 m/s, the water has a pH of 6.5 and a temperature of 25°C. Assume that50% of the applied dose is consumed by reactions, leaving a free chlorine residual of 1 mg/L asCl.a) If the concentration of Giardia cysts in the drinking water supply is to be decreased from10 per 1000 L to 1 per 1000 L, calculate the percentage of inactivation.b) You are asked to design a chlorine contact reactor to achieve at least 99.9% inactivationof Giardia cysts. What is the required detention time and volume of the reactor if thebaffling condition is superior?c) If the pH is increased to 8.0 for corrosion control before disinfection (not nomally apractice that is used), what is the % inactivation of Giardia achieved in the tank?

Given: Chlorine = 2 mh/l Discharge=0.05m3s =0.05×3600…

unfiltered water supply is disınfected with an applied chlorine dose of 2 mg/L as Cl. The ak hourly flow is 0.05 m?/s, the water has a pH of 6.5 and a temperature of 25°C. Assume that % of the applied dose is consumed by reactions, leaving a free chlorine residual of 1 mg/L as

unfiltered water supply is disınfected with an applied chlorine dose of 2 mg/L as Cl. The ak hourly flow is 0.05 m?/s, the water has a pH of 6.5 and a temperature of 25°C. Assume that % of the applied dose is consumed by reactions, leaving a free chlorine residual of 1 mg/L as

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Author:KASSIMALI, Aslam.

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Chapter2: Loads On Structures

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Fluid Materials

In general terms, anything that flows can be termed as a fluid. In other words, a fluid is any substance that cannot resist shear forces and deforms continuously under the application of external shear forces. Fluid materials differ completely from solid materials such as metals and alloys. For instance, if we consider two infinitesimally small cross-sectional areas of fluid materials and solid materials, and apply shear forces to these elements, both the elements will undergo deformation. Upon releasing the shear force, the element of the solid materials will regain its original orientation, but the element of the fluid materials will keep on deforming continuously under the action of the shear force.

Question

Ấn unfiltered water supply is disinfected with an applied chlorine dose of 2 mg L as Clh. The
peak hourly flow is 0.05 m/s, the water has a pH of 6.5 and a temperature of 25°C. Assume that
50% of the applied dose is consumed by reactions, leaving a free chlorine residual of 1 mg/L as
Cl.
a) If the concentration of Giardia cysts in the drinking water supply is to be decreased from
10 per 1000 L to 1 per 1000 L, calculate the percentage of inactivation.
b) You are asked to design a chlorine contact reactor to achieve at least 99.9% inactivation
of Giardia cysts. What is the required detention time and volume of the reactor if the
baffling condition is superior?
c) If the pH is increased to 8.0 for corrosion control before disinfection (not nomally a
practice that is used), what is the % inactivation of Giardia achieved in the tank?

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