Fluoridation Flashcards
Fluoride added at a water treatment plant should be added ___ the water has received complete treatment.
After
The plant flow meter is used to send a signal to the ___ feed control system to automatically adjust ___ ___ based on plant flow.
Fluoride, fluoride dosing
A positive displacement ___ pump is generally used for feeding a fluoride solution because it is accurate and will operate against pressure.
diaphragm
___ ___ come in powder or crystal form, has no odor, and has a pH of 7 when in a saturated solution.
sodium fluoride
Fluoride levels above ___ mg/l will cause teeth to become pitted or discolored.
4 mg/l
The pH range of sodium hypochlorite ___ to ___ pH units.
9 to 11
A saturated sodium fluoride solution has a pH of ___.
7
The fluoride concentration of treated water should be measured ___.
Daily.
If the natural fluoride content of the raw water is variable, the concentration of the raw water should be measured ___.
daily
For treating flows of less than 100 gpm, the layer of sodium fluoride crystals be maintained in a saturator tank should be ___ thick.
6 inches
___ feeders are less expensive to maintain than ___ feeders.
volumetric, gravimetric
___ ___ crystals are used in downflow saturators.
sodium fluoride
The commercial purity of fluorosilicic acid is ___ to ___%.
20 - 30%
The commercial purity of sodium fluoride is ___ to ___ %.
97 to 98%
The commercial purity of sodium fluorosilicate is ___ to ___%.
98 to 99%
