12 Va. Admin. Code § 5-590-930 - Fluoridation
A. The board
recommends that all community waterworks in Virginia be optimally fluoridated.
Fluoridation feed systems shall be designed to deliver the optimum fluoride ion
concentration as determined by the U.S. Department of Health and Human
Services.
B. Fluoride compounds.
Commercial sodium fluoride, sodium fluorosilicate (also called sodium
silicofluoride), and fluorosilicic acid (also called hydrofluorosilicic acid)
shall conform to the applicable AWWA standards or NSF/ANSI/CAN Standard
60-2020, as appropriate.
C.
Fluoride compound storage. Fluoride chemicals shall be isolated from other
chemicals to prevent cross contamination. Compounds shall be stored in covered
or unopened shipping containers in a separate room (except sodium fluoride
saturators) with the chemical feeder.
D. Chemical feed installations.
1. Scales and loss-of-weight recorders for
dry chemical feeders and hydrofluorosilicic acid feeders shall be
provided.
2. Fluoride metering
pumps shall have an accuracy so that the actual feed rate will be within 5.0%
of the intended feed rate.
3. The
point of application shall be located to provide adequate mixing.
4. All fluoride feed lines shall be provided
with adequate anti-siphon devices.
5. Design of fluoride saturators shall
consider:
a. The source water hardness. The
water applied to the sodium fluoride saturator feeders shall be softened if the
hardness exceeds 50 mg/L.
b. The
fluoride source. Use only sodium fluoride in the saturators.
c. A flow restrictor with a maximum flow of
2.0 gpm on all upflow saturators.
6. Adequate fluoride feed rate control and
mixing shall be provided.
7.
Provisions shall be made for venting fluorosilicic acid carboys to the outside
of the building when the carboys are in use.
E. Suitable protective equipment shall be
provided which includes gloves, aprons, dust mask, and goggles.
F. Suitable equipment shall be provided for
wet mopping and hosing dust that might accumulate in the plant. Dry feeders
shall be equipped with bag loading hoppers.
G. Equipment shall be provided for measuring
the quantity of fluoride ion in the water. Testing equipment shall be
colorimetric or electrode type as approved by the department.
Notes
Statutory Authority: §§ 32.1-12 and 32.1-170 of the Code of Virginia.
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