WASTEWATER EXAM CLASS C
Effluent should be Neutralized so it does not adversely affect the
aquatic life. What should the PH be
A. 2
B. 4
C. 7
D. 10
E. 12 - ANSWERS-C. 7
A centrifugal pump running at 100% with restricted flow is
registering 40 amps. If the pump is changed to run at 50% and the
restriction is removed causing increased flow. What happens to the
number of amps?
A. Increase
B. Decrease
C. Stays the same
D. Does not Change - ANSWERS-B. Decrease
The chlorine room is required to have two air vents. One is a forced
air fan at the top where should the vent on the opposite wall be
placed?
,A. At the top
B. Half way up the wall
C. At the Bottom - ANSWERS-C. At the Bottom
Carbon Dixoide is hazrdous in a closed environment In an activated
sludge plant this could - ANSWERS-Makes up 3-4% of normal
sludge gas
The required detention time for a chlorine contact chamber is how
many minutes?
A. 5
B. 10
C. 15
D. 20
E. 25 - ANSWERS-D. 20
If a treatment plant has a high air flow rate and it is not overloaded
with BOD, what could be the cause of low dissolved oxygen. -
ANSWERS-Leaks in the air lines, and plugged diffusers
The influent BOD is not high bu the plant appears to be overloaded.
What could be causing the problem?
A. High solids from thickeners to digester
, B. High solids in belt press
C. Supernatant from digester to aeration
D. RAS too high - ANSWERS-D. RAS too high
What are some of the disadvantages of a manual bar screen? -
ANSWERS-Must be cleaned often
Grease and oil can pass through a plant and cause? - ANSWERS-
Pumps too clog, collect on weirs, pass through the facility and
endanger aquatic life.
After collecting a 30 Min. set, what characteristics of a true bulking
sludge would show?
A. Settles fast with a cloudy supernatant
B. Settles slowly with only a few milliliters of clear liquid at the top
C. Sludge in bottom 1/3 with clear supernate
D. Settles slowly with fluffy sludge
E. Settles fast with clear supernate and pin floc - ANSWERS-B.
Settles slowly with only a few milliliters of clear liquid at the top
Ponds should be designed to
A. always be 10 feet deep
B. Have an influent pipe with multiple outlets
Effluent should be Neutralized so it does not adversely affect the
aquatic life. What should the PH be
A. 2
B. 4
C. 7
D. 10
E. 12 - ANSWERS-C. 7
A centrifugal pump running at 100% with restricted flow is
registering 40 amps. If the pump is changed to run at 50% and the
restriction is removed causing increased flow. What happens to the
number of amps?
A. Increase
B. Decrease
C. Stays the same
D. Does not Change - ANSWERS-B. Decrease
The chlorine room is required to have two air vents. One is a forced
air fan at the top where should the vent on the opposite wall be
placed?
,A. At the top
B. Half way up the wall
C. At the Bottom - ANSWERS-C. At the Bottom
Carbon Dixoide is hazrdous in a closed environment In an activated
sludge plant this could - ANSWERS-Makes up 3-4% of normal
sludge gas
The required detention time for a chlorine contact chamber is how
many minutes?
A. 5
B. 10
C. 15
D. 20
E. 25 - ANSWERS-D. 20
If a treatment plant has a high air flow rate and it is not overloaded
with BOD, what could be the cause of low dissolved oxygen. -
ANSWERS-Leaks in the air lines, and plugged diffusers
The influent BOD is not high bu the plant appears to be overloaded.
What could be causing the problem?
A. High solids from thickeners to digester
, B. High solids in belt press
C. Supernatant from digester to aeration
D. RAS too high - ANSWERS-D. RAS too high
What are some of the disadvantages of a manual bar screen? -
ANSWERS-Must be cleaned often
Grease and oil can pass through a plant and cause? - ANSWERS-
Pumps too clog, collect on weirs, pass through the facility and
endanger aquatic life.
After collecting a 30 Min. set, what characteristics of a true bulking
sludge would show?
A. Settles fast with a cloudy supernatant
B. Settles slowly with only a few milliliters of clear liquid at the top
C. Sludge in bottom 1/3 with clear supernate
D. Settles slowly with fluffy sludge
E. Settles fast with clear supernate and pin floc - ANSWERS-B.
Settles slowly with only a few milliliters of clear liquid at the top
Ponds should be designed to
A. always be 10 feet deep
B. Have an influent pipe with multiple outlets
