The length of water distribution system is 6000 ft, the peak velocity is 8.33 fps, the water temperature is 5 °C and pH is 7.5. If the free chlorine residual in the water distribution system is 0.5 mg/L, what is the log inactivation of viruses? (See the table on page 3). NEED help!
The length of water distribution system is 6000 ft, the peak velocity is 8.33 fps, the water temperature is 5 °C and pH is 7.5. If the free chlorine residual in the water distribution system is 0.5 mg/L, what is the log inactivation of viruses? (See the table on page 3). NEED help!
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The length of water distribution system is 6000 ft, the peak velocity is 8.33 fps, the water temperature is 5 °C and pH is 7.5. If the free chlorine residual in the water distribution system is 0.5 mg/L, what is the log inactivation of viruses? (See the table on page 3).
NEED help!
![The length of water distribution system is 6000 ft, the peak velocity is 8.33 fps, the water temperature
is 5 °C and pH is 7.5. If the free chlorine residual in the water distribution system is 0.5 mg/L, what is
the log inactivation of viruses? (See the table on page 3).
Table 11.9 C-t Values for Inactivation of Viruses at Various Temperatures and pH 6-9⁰
WATER TEMPERATURE
Free chlorine
Preformed chloramine
Chlorine dioxide
Ozone
LOG
INACTIVATION
2.0
3.0
4.0
2.0
3.0
2.0
3.0
2.0
3.0
0.5°C
[(mg/l)-min]
6
9
12
1200
2100
8.4
25.6
0.9
1.4
5°C
[(mg/1)-min]
4
6
8
860
1400
5.6
17.1
0.6
0.9
10°C
[(mg/l)-min]
3
4
6
640
1100
4.2
12.8
0.5
0.8
15°C
[(mg/l)-min]
2
3
4
430
710
2.8
8.6
0.3
0.5
20°C
[(mg/l)-min]
1
2
3
320
530
2.1
6.4
0.2
0.4
Source: Adapted from Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources
(Environmental Protection Agency, 1991).
"Cr values for free chlorine, ozone, and chlorine dioxide include safety (uncertainty) factors. The chloramine values are based on laboratory data using preformed
chloramine to inactivate hepatitis A and do not include a safety factor.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F727305e5-8ade-4592-aabe-3f8145c266f2%2F805946d8-86d9-44bb-bfa2-4de2f979f344%2F4xoddv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The length of water distribution system is 6000 ft, the peak velocity is 8.33 fps, the water temperature
is 5 °C and pH is 7.5. If the free chlorine residual in the water distribution system is 0.5 mg/L, what is
the log inactivation of viruses? (See the table on page 3).
Table 11.9 C-t Values for Inactivation of Viruses at Various Temperatures and pH 6-9⁰
WATER TEMPERATURE
Free chlorine
Preformed chloramine
Chlorine dioxide
Ozone
LOG
INACTIVATION
2.0
3.0
4.0
2.0
3.0
2.0
3.0
2.0
3.0
0.5°C
[(mg/l)-min]
6
9
12
1200
2100
8.4
25.6
0.9
1.4
5°C
[(mg/1)-min]
4
6
8
860
1400
5.6
17.1
0.6
0.9
10°C
[(mg/l)-min]
3
4
6
640
1100
4.2
12.8
0.5
0.8
15°C
[(mg/l)-min]
2
3
4
430
710
2.8
8.6
0.3
0.5
20°C
[(mg/l)-min]
1
2
3
320
530
2.1
6.4
0.2
0.4
Source: Adapted from Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources
(Environmental Protection Agency, 1991).
"Cr values for free chlorine, ozone, and chlorine dioxide include safety (uncertainty) factors. The chloramine values are based on laboratory data using preformed
chloramine to inactivate hepatitis A and do not include a safety factor.
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