Disinfection of Storage Facilities - Disinfection of Pipelines and Storage Facilities Field Guide - page 82

Example 2. Use the chlorinate and fill chlorination
method for a 50 mg/L chlorine dosage and a 24-hr contact time.
How much 65 percent calcium hypochlorite is needed for a rec-
tangular tank that is 10 m long, 5 m wide, and has a maximum
water depth of 5 m?
Use all SI units.
1. Volume from rectangular tank calculator
10 0.05 = 12.5 m 3

2. Amount of calcium hypochlorite from Table 5-6
7.7 kg
3. Chemical strength factor is Table 5-6 strength/strength
in example
65% calcium hypochlorite ÷ 65% calcium hypochlorite =
1
4. Volume used in Table 5-6
100 m 3
Plug these values into the calculator.
12.5

0.05 = 250 m 3 5 5

× × × ×

1 ÷ 100 = 0.96 kg of 65% calcium
hypochlorite

7.7

× ×

References
ANSI/AWWA C652. AWWA Standard for Disinfection of Water-
Storage Facilities . American Water Works Association:
Denver, Colo.
Standard Methods for the Examination of Water and Wastewater
(current edition). APHA, AWWA, WEF: Washington, D.C.