A treatment plant has been designed to achieve 99 percent inactivation of Giardia Lamblia using chlorine dioxide. The engineer used data on the disinfection of Giardia Lamblia at 20°C for the design, but the plant operates in a northern climate, and current estimates are that the low water temperature in some winters will be 0.5°C. Estimate the expansion required in the contact chamber in order to achieve the same inactivation at that temperature. You may assume complete mixing in the contact chamber and that the inactivation of Giardia Lamblia follows the Chick-Watson relationship. Ct values for achieving 90% inactivation of Giardia Lamblia (mg.min/L) Temperature (°℃) 10 °C 15 °C 0.48 0.32 Chlorine dioxide 0.5 °C 0.97 5 °C 0.63 20 °C 0.24 25 °C 0.16

A treatment plant has been designed to achieve 99 percent inactivation of Giardia Lamblia using chlorine dioxide. The engineer used data on the disinfection of Giardia Lamblia at 20°C for the design, but the plant operates in a northern climate, and current estimates are that the low water temperature in some winters will be 0.5°C. Estimate the expansion required in the contact chamber in order to achieve the same inactivation at that temperature. You may assume complete mixing in the contact chamber and that the inactivation of Giardia Lamblia follows the Chick-Watson relationship. Ct values for achieving 90% inactivation of Giardia Lamblia (mg.min/L) Temperature (°℃) 10 °C 15 °C 0.48 0.32 Chlorine dioxide 0.5 °C 0.97 5 °C 0.63 20 °C 0.24 25 °C 0.16

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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Question

A treatment plant has been designed to achieve 99 percent inactivation of Giardia
Lamblia using chlorine dioxide. The engineer used data on the disinfection of Giardia
Lamblia at 20°C for the design, but the plant operates in a northern climate, and current
estimates are that the low water temperature in some winters will be 0.5°C. Estimate the
expansion required in the contact chamber in order to achieve the same inactivation at
that temperature. You may assume complete mixing in the contact chamber and that the
inactivation of Giardia Lamblia follows the Chick-Watson relationship.
Ct values for achieving 90% inactivation of Giardia Lamblia (mg.min/L)
Temperature (°C)
0.5 °C
5 °C
10 °C
15 °C
Chlorine
0.97
0.63
0.48
0.32
dioxide
* Note that the chick Watson's disinfection rate constant is a function of temperature.
20 °C
0.24
25 °C
0.16

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