Environmental Engineering Reference
In-Depth Information
Solution: Change 440 ppb to ppm:
440 ppb ÷ 1000 = 0.44 ppm (mg/L)
Change 2,000,000 gpd to MGD:
2,000,000 gpd ÷ 1,000,000 = 2 MGD
Find pounds of fluoride:
Fluoride = 0.44 ppm × 2.0 MGD × 8.34 lb/gal = 7.3 lb/day
Change percent available to a decimal equivalent:
20% = 0.2
Find pounds per day of fluoride solution:
7.3 lb/day ÷ 0.2 = 36.5 lb/day
Find gallons per day of fluoride:
36.5 lb/day solution ÷ 8.34 lb/gal = 4.4 gpd
Change gallons per day to milliliters per minute:
4.4 gpd × 2.6 = 11.4 mL/min
Example 6.31
Problem : An 18% available alum solution is used to dose 800,000 gpd at 22 mg/L.
How many milliliters per minute is the pump feeding?
Solution : Change 800,000 gpd to MGD:
800,000 gpd = 0.8 MGD
Find pounds of alum:
Alum = 22 mg/L × 0.8 MGD × 8.34 lb/gal = 147 lb/day
Change percent available to a decimal equivalent:
18% = 0.18
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