Wastewater III Study Exam UPDATED
ACTUAL Questions and CORRECT
Answers
First action for a polymer spill - CORRECT ANSWER✔✔- Apply an absorbent to the spill
such as sand or kitty litter and then sweep up the materials.
Total discharge head includes - CORRECT ANSWER✔✔- Discharge pressure head + static
discharge head + Velocity head (outlet) + Friction Head (discharge line)
Where is the best location to collect a sample? - CORRECT ANSWER✔✔- A location that
represents the entire waste stream or basin.
What are the preservation and hold times for BOD samples? - CORRECT ANSWER✔✔- 48
hours at < or = to 6 degrees C.
Define BOD. - CORRECT ANSWER✔✔- The rate at which organisms use the oxygen in
water or waste water while stabilizing decomposeable organic matter under aerobic
conditions.
What is the purpose of a dessicator? - CORRECT ANSWER✔✔- To allow residual samples
to control moisture prior to weighing.
What will happen if the flow to the grit chamber is too low? - CORRECT ANSWER✔✔-
Too much organic material will be deposited.
How does an operator control the suspended solids in an activated sludge basin? - CORRECT
ANSWER✔✔- By wasting and returning activated sludge.
Chlorine combines with ammonia to form what - CORRECT ANSWER✔✔- Chloramines
What can the operator control with the activated sludge process? - CORRECT
ANSWER✔✔- Wasting and return rates.
, What is the best way to control filamentous bacteria? - CORRECT ANSWER✔✔- Addition
of chlorine to the (RAS.) Called return on some tests.
A 5.2 acre lagoon with an in-fluent of 47000 gallons per day is dropped 3 inches a day from a
depth of 5 feet to a depth of 2 feet. How many gallons are discharged each day? - CORRECT
ANSWER✔✔- 470,577 gallons per day (exact problem)
Define endogenous respiration. - CORRECT ANSWER✔✔- A situation where living
organisms oxidize some of their own cellular mass instead of new organic matter they absorb
or absorb from their environment.
What should the velocity of the sewage in a gravity sewer line be coming into the waste
water plant? - CORRECT ANSWER✔✔- At least 2.0 Feet per second.
What does hydrogen sulfide do in a collection system? - CORRECT ANSWER✔✔- It
causes corrosion.
What must be on the warning tag attached to a switch that has been locked out? - CORRECT
ANSWER✔✔- The signature of the person who locked out the switch and who is the only
person authorized to remove the tag.
Primary clarification generally removes what percentage of TSS? (Total Suspended Solids) -
CORRECT ANSWER✔✔- 40 to 60%
How is the flow of the chlorine controlled from the chlorinator? - CORRECT ANSWER✔✔-
With a rotometer.
Chlorine is corrosive when it mixes with? - CORRECT ANSWER✔✔- Moisture
What is the acceptable leak rate of a mechanical seal? - CORRECT ANSWER✔✔-
Mechanical seals should not leak.
ACTUAL Questions and CORRECT
Answers
First action for a polymer spill - CORRECT ANSWER✔✔- Apply an absorbent to the spill
such as sand or kitty litter and then sweep up the materials.
Total discharge head includes - CORRECT ANSWER✔✔- Discharge pressure head + static
discharge head + Velocity head (outlet) + Friction Head (discharge line)
Where is the best location to collect a sample? - CORRECT ANSWER✔✔- A location that
represents the entire waste stream or basin.
What are the preservation and hold times for BOD samples? - CORRECT ANSWER✔✔- 48
hours at < or = to 6 degrees C.
Define BOD. - CORRECT ANSWER✔✔- The rate at which organisms use the oxygen in
water or waste water while stabilizing decomposeable organic matter under aerobic
conditions.
What is the purpose of a dessicator? - CORRECT ANSWER✔✔- To allow residual samples
to control moisture prior to weighing.
What will happen if the flow to the grit chamber is too low? - CORRECT ANSWER✔✔-
Too much organic material will be deposited.
How does an operator control the suspended solids in an activated sludge basin? - CORRECT
ANSWER✔✔- By wasting and returning activated sludge.
Chlorine combines with ammonia to form what - CORRECT ANSWER✔✔- Chloramines
What can the operator control with the activated sludge process? - CORRECT
ANSWER✔✔- Wasting and return rates.
, What is the best way to control filamentous bacteria? - CORRECT ANSWER✔✔- Addition
of chlorine to the (RAS.) Called return on some tests.
A 5.2 acre lagoon with an in-fluent of 47000 gallons per day is dropped 3 inches a day from a
depth of 5 feet to a depth of 2 feet. How many gallons are discharged each day? - CORRECT
ANSWER✔✔- 470,577 gallons per day (exact problem)
Define endogenous respiration. - CORRECT ANSWER✔✔- A situation where living
organisms oxidize some of their own cellular mass instead of new organic matter they absorb
or absorb from their environment.
What should the velocity of the sewage in a gravity sewer line be coming into the waste
water plant? - CORRECT ANSWER✔✔- At least 2.0 Feet per second.
What does hydrogen sulfide do in a collection system? - CORRECT ANSWER✔✔- It
causes corrosion.
What must be on the warning tag attached to a switch that has been locked out? - CORRECT
ANSWER✔✔- The signature of the person who locked out the switch and who is the only
person authorized to remove the tag.
Primary clarification generally removes what percentage of TSS? (Total Suspended Solids) -
CORRECT ANSWER✔✔- 40 to 60%
How is the flow of the chlorine controlled from the chlorinator? - CORRECT ANSWER✔✔-
With a rotometer.
Chlorine is corrosive when it mixes with? - CORRECT ANSWER✔✔- Moisture
What is the acceptable leak rate of a mechanical seal? - CORRECT ANSWER✔✔-
Mechanical seals should not leak.
