C1 Ops & Maint - C. Sedimentation Flashcards
C. Sedimentation / D. Filtration
D. Filtration
Sedimentation is improved by:
A. Short-circuting
B. Reducing the detention poeiod in the basin
C. Uniform, horizontal, low velocity flow across the basin
D. A thick sludge build up st the bottom of the basin
C. Uniform, horizontal, low velocity flow across the basin
D. Filtration
What is the calm area within a settling basin, necessaryfor suspended materials to settle:
A. Inlet zone
B. Outlet zone
C. Settling zone
D. Sludge zone
C. Settling zone
D. Filtration
Over a period of time sludge accumulation in settling basins will usualy:
A. Result in high levels of nitrates
B. Cause alum leaching
C. Result in tastes and odors
D. Reduce the flow in the rate in the basin
C. Result in tastes and odors
D. Filtration
Normal operation if a sedimentation basin would include monitoring which of the following:
A. Turbidity into and out of basin and temperature.
B. Floc paddle speed and floc cary over.
C. Turbidity out of filters and contact time.
D. Temperature and alkilinity.
A. Turbidity into and out of basin and temperature.
D. Filtration
- What happens in a treatment plant when the flow is increased?
A. High
D. Filtration
Sample bottle/bag should be filled as follows:
A. Just at the fill line.
B.
C. As needed.
D. About one inch from the top.
E. A, B & C
D. B & D
F. B (Just above the fill line) & D (About one inch from the top)
D. Filtration
Sample bottles need to be __________ by the lab & _____ for ____.
Sample bottles need to be sterilized by the lab & ready for use.
sterilized
ready
use
D. Filtration
Sample bottles have ______ ___________ in them to neutralize the ________.
Sample bottles have Sodium Thiosulfate in them to neutralize the Chlorine.
Sodium
Thiosulfate
Chlorine
D. Filtration
TRUE or FALSE
The purpose of the sedimentation process is to remove suspended solids that are denser than the water and reduce the load on the filters.
TRUE
C. Sedimentation / D. Filtration
The term used to express the filtration rate of a filter is:
A. Gallons
B. MGD/CF
C. gpm/ft2
D. CFS
C. gpm/ft2
D. Filtration
Coagulation and sedimentation alone cannot remove all of the turbidity and suspended matter in raw water.
The final step in the removal of suspended matter in water is:
A. Chlorination
B. Sterilization
C. Flocculation
D. Filtration
D. Filtration
D. Filtration
Filters in a water treatment process are primarily for removing or reducing:
A. Color
B. Tastes and odors
C. Carbon dioxide
D. Turbidity
D. Turbidity
D. Filtration
Which of the following is the most important mechanism involved in the filtration process?
A. Biological action
B. Straining
C. Adsorption
D. Sedimentation
C. Adsorption
D. Filtration
What is the purpose of the underdrain system on a treatment plant filter?
A. To diperse surface wash flows evenly across the filter
B. To evenly collect filtered water and disperse backwash water
C. To prevent a cross cronnection from the clearwell to the sedimentation basin
D. To increase the flow rater through the filter
B. To evenly collect filtered water and disperse backwash water
D. Filtration
The common types of underdrain systems include the following:
A. Pipe lateral collectors, perforated tile bottoms, “Wheeler” bottoms< porous plate bottoms, and false-floor (Be familiar with all of these tupe of underdrain systems)
A. Pipe lateral collectors, perforated tile bottoms, “Wheeler” bottoms< porous plate bottoms, and false-floor (Be familiar with all of these tupe of underdrain systems)
D. Filtration
In a coventional water filtration plant, the filter surface wash system is designed to prevent:
A. Air binding
B. Coal and sand loss
C. Break through
D. Mud balls
D. Mud balls
D. Filtration
What is the most important water quality indicator used to monitor the filtration process?
A. Effluent turbidity
B. pH
C.Chlorine residual
D. Backwash rate
A. Effluent turbidity
D. Filtration
Which of the following could cause short filter runs?
A. Overdosing of filter aid chemicals
B. Underdosing of filter aid chemicals
C. Low water temperatue
D. Low filtration rate
A. Overdosing of filter aid chemicals
D. Filtration
What valve is in the open position during the backwash mode of a gravity type filter?
A. Influent valve
B. Drain valve
C. Effluent valve
D. None of the above
B. Drain valve
D. Filtration
TRUE or FALSE
Gravity type rapid sand filters use an underdrain system that serves to support the filter medium, collect filtered water and distribute backwash water.
TRUE
