# CWS 102 Grossmont College Find the Required Liquid Fluoride Feed Rate In GPD MCQs

Description

i need answer about 3 math questions and one true and false

3-Find the required liquid fluoride feed rate in GPD. The target fluoride residual is 1.0 mg/L.
There is 0.35 mg/L naturally occurring in the source water. A 150 horsepower pump is
delivering water to the treatment plant at 3500 GPM. The fluoride is a 23% percent acid solution
that has a specific gravity of 1.2 and has an ion purity (or AFI) of 79.2%.
12 gpd
15 gpd
22.1 gpd
None of these
4-How many feet will a wash water tank drop if it is 55 feet in diameter and 25 feet
tall. A filter has a back wash rate of 26,643 gals/min for 8 minutes.
11.99 ft
6.99 ft
15.99 ft
None of these
6-A conventional plant gets 2 log credit for virus removal. The plant is using ozone as its
primary disinfectant. How many virus log inactivation will be needed by the ozone
system?
2 log
2.5 log
3 log
4 log
8-(True or False) Dissolve Air Flotation can be used in place of a sedimentation basin.
The process uses gas bubbles to attach and carry solids to the surface
True
False
D
Question 6
1 pts
A conventional plant gets 2 log credit for virus removal. The plant is using ozone as its primary
disinfectant. How many virus log inactivation will be needed by the ozone system?
2 log
25 log
3 log
4 log
D
Question 8
1 pts
(True or False) Dissolve Air Flotation can be used in place of a sedimentation basin. The process uses
gas bubbles to attach and carry solids to the surface
True
O False
uchar.com/co326 1926
VueSLUIT
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Find the required liquid fluoride feed rate in GPD. The target fluoride residual is 1.0 mg/L. There is
0.35 mg/L naturally occurring in the source water. A 150 horsepower pump is delivering water to
the treatment plant at 3500 GPM. The fluoride is a 23% percent acid solution that has a specific
gravity of 1.2 and has an ion purity (or AFI) of 79.2%
12 gpd
15 god
O 22.1 spd
None of these
2 pts
D
Question 4
How many feet will a wash water tank drop if it is 55 feet in diameter and 25 feet tall. A filter has a
back wash rate of 26,643 gals/min for 8 minutes.
11.99 ft
6.99 ft
15.99 ft
None of these
Omastan