Maryland 5A Wastewater exam
Maryland 5A Wastewater exam
Study online at https://quizlet.com/_r9fo7
1. reduce the amount of How would you stop foaming in an anaerobic digester?
sludge removed from
the digester
2. the temperature de- The thickest sludge is obtained from a gravity thickener when
creases
3. is more than around a On a belt filter press, the pressure applied to the cake as it goes around a
large roller small roller
4. keep the flow the same as wastewater is applied to a mixed media filter and the head pressure to
to the filter area the filter increases, the flow controller will
5. increase the aeration if the F/M ratio is increased to an aeration basin and the operator wants to
rate maintain the same dissolved oxygen level in the aerator, what action would
the operator take
6. decrease WAS In a new activated sludge plant, billows of white sudsy foam appear on the
aeration tank. What process control step should the operator take?
7. decrease the efficiency what effect would a worn impeller have on a centrifugal pump?
8. if there are no ther- If an operating three phase motor is driving a pump and one phase is lost,
mal overloads the mo- what will happen?
tor will be damaged
9. discharge pressure What would be the cause of leaking around the seals and the plunger on
too high a plunger pump?
10. velocity increases and As grit accumulated in a grit chamber, what happens to the velocity of the
settleability decreases wastewater flow and the settleability of the grit?
11. Throttle the discharge How can you change the pumping volume of a centrifugal pump?
valve, change the
1/6
, Maryland 5A Wastewater exam
Maryland 5A Wastewater exam
Study online at https://quizlet.com/_r9fo7
speed of the pump,
lower the discharge
head
12. process efficiency will How would an increase in suspended solids effect the ultraviolet disinfec-
be decreased tion process?
13. the oxygen uptake what effect would an overloading of BOD have on the biological growth in
would increase the aeration tank?
14. flagellates, ciliates and What combination of microorganisms would reflect a well balanced acti-
rotifers vated sludge?
15. they discharge a con- What is the advantage of using a positive displacement pump for feeding
sistent volume chemicals?
16. settleable What types of solids does and Imhoff cone measure?
17. drum speed too fast What would cause a vacuum filter to produce a wet cake?
18. dry chemical what type of fire extinguisher would you use for an oil and electrical fire?
19. adding quicklime to Slaking is the process of...
the water
20. perform lock- what is the first thing you do before starting work on a pump?
out/tagout
21. at the chlorine con- when shutting down feed to a chlorinator, where do you start?
tainer
22. backflow check valve what stops water from entering a chlorinator?
23. waste activated sludge what is the best type of sludge to use with a dissolved air flotation thick-
ener?
2/6
Maryland 5A Wastewater exam
Study online at https://quizlet.com/_r9fo7
1. reduce the amount of How would you stop foaming in an anaerobic digester?
sludge removed from
the digester
2. the temperature de- The thickest sludge is obtained from a gravity thickener when
creases
3. is more than around a On a belt filter press, the pressure applied to the cake as it goes around a
large roller small roller
4. keep the flow the same as wastewater is applied to a mixed media filter and the head pressure to
to the filter area the filter increases, the flow controller will
5. increase the aeration if the F/M ratio is increased to an aeration basin and the operator wants to
rate maintain the same dissolved oxygen level in the aerator, what action would
the operator take
6. decrease WAS In a new activated sludge plant, billows of white sudsy foam appear on the
aeration tank. What process control step should the operator take?
7. decrease the efficiency what effect would a worn impeller have on a centrifugal pump?
8. if there are no ther- If an operating three phase motor is driving a pump and one phase is lost,
mal overloads the mo- what will happen?
tor will be damaged
9. discharge pressure What would be the cause of leaking around the seals and the plunger on
too high a plunger pump?
10. velocity increases and As grit accumulated in a grit chamber, what happens to the velocity of the
settleability decreases wastewater flow and the settleability of the grit?
11. Throttle the discharge How can you change the pumping volume of a centrifugal pump?
valve, change the
1/6
, Maryland 5A Wastewater exam
Maryland 5A Wastewater exam
Study online at https://quizlet.com/_r9fo7
speed of the pump,
lower the discharge
head
12. process efficiency will How would an increase in suspended solids effect the ultraviolet disinfec-
be decreased tion process?
13. the oxygen uptake what effect would an overloading of BOD have on the biological growth in
would increase the aeration tank?
14. flagellates, ciliates and What combination of microorganisms would reflect a well balanced acti-
rotifers vated sludge?
15. they discharge a con- What is the advantage of using a positive displacement pump for feeding
sistent volume chemicals?
16. settleable What types of solids does and Imhoff cone measure?
17. drum speed too fast What would cause a vacuum filter to produce a wet cake?
18. dry chemical what type of fire extinguisher would you use for an oil and electrical fire?
19. adding quicklime to Slaking is the process of...
the water
20. perform lock- what is the first thing you do before starting work on a pump?
out/tagout
21. at the chlorine con- when shutting down feed to a chlorinator, where do you start?
tainer
22. backflow check valve what stops water from entering a chlorinator?
23. waste activated sludge what is the best type of sludge to use with a dissolved air flotation thick-
ener?
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