Environmental Engineering Reference
In-Depth Information
￿
The first value is 5% of the volume of the tank. This
comes from the tank volume calculators or Table 5-2 for
horizontal cylindrical tanks and then multiplied by 0.05
to obtain the 5% volume (for the horizontal cylindrical
tank use 0.1 as the factor to obtain the 5% volume).
￿
Next, insert the value from Table 5-6 for the chemical
selected (liquid chlorine, sodium hypochlorite, or calcium
hypochlorite).
￿
The third factor is an adjustment for the strength of the
chemical if it differs from the amount in Table 5-6. The
factor is the strength shown in the table divided by the
strength you are using.
￿
The fourth factor is the volume used in Table 5-6 (either
100,000 gallons for US units or 100 cubic meters for SI
units).
Example 1. The chlorinate and fill method is used for a
vertical cylindrical tank that is 20 ft in diameter and the maxi-
mum depth to the overflow is 30 ft. The disinfection chemical
selected is 10% sodium hypochlorite.
Use all US units.
1. Volume from vertical cylindrical tank calculator
5.87
20 ft
20 ft
30 ft
0.05 = 70,400 gal
0.05 =
×
×
×
×
×
3,520 (for 5% depth and volume)
2. Amount of sodium hypochlorite from Table 5-6
97 gal
3. Chemical strength factor is Table 5-6 strength/strength
in example
5% ÷ 10% = 0.5
4. Volume used in Table 5-6
100,000 gal
Plug these values into the calculator.
3,520
0.5 ÷ 100,000 = 1.7 gal of 10% sodium
hypochlorite
97
×
×
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