By American Water Works Association
Fluoridation is the addition of the chemical fluoride in ingesting water to lessen teeth decay. because fluoridation remedy grew to become universal perform over 50 years in the past, enamel decay has been lowered forty to sixty five percent.
This handbook offers info and advice at the layout, operation, and upkeep of fluoridation structures in water therapy. assurance comprises human wellbeing and fitness results of fluoride, calculating dosage, feed platforms, set up, operation, upkeep, and defluoridation
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In addition, if the feed rate for solution feed is impractically low, a more dilute solution can be fed (although this is not preferred). Conversely, there is almost no upper limit to the capacity of gravimetric dry feeders or pumps. Large water plants can select either dry feed using sodium fluorosilicate or direct feed using fluorosilicic acid. All other water plants have a choice, modified by individual circumstances. Assistance can be obtained from state health department engineers, manufacturers’ representatives, and consultants.
The metering pump should be equipped with an antisiphon valve. There should also be an antisiphon valve at the fluoride injection point if the fluoride solution is injected into a water main. Once the solution has been adjusted, the only operator attention required is the occasional replenishing of chemical (without weighing) and the cleaning of the saturator. The fluoride saturator does not need to be sealed as tightly as the acid carboy. Saturator systems should have a water meter and, if necessary, a water softener.
A sodium fluoride saturator is to be used to treat a plant rate of 180 gpm. Determine the feed rate in gallons per minute and milliliters per minute. 009 gpm × 3,785 mL/gal = 34 mL/min EXAMPLE CALCULATED DOSAGE PROBLEMS___________________________ Sodium Fluorosilicate Example 1. 5 percent chemical purity). 84 mg/L Example 2. 5 percent chemical purity). 06 mg/L Fluorosilicic Acid Example 1. What is the calculated dosage for a plant using 43 lb of 23 percent fluorosilicic acid to treat 1,226,000 gal of water?