Wastewater Practice exam questions
and answers 100% pass
When organic wastes are discharged to receiving waters, O2 is depleted by _____. ✔✔bacteria
Hydrogen sulfide gives off an odor similar to____. ✔✔rotten eggs
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Wastewater Practice exam questions
and answers 100% pass
When organic wastes are discharged to receiving waters, O2 is depleted by _____. ✔✔bacteria
Hydrogen sulfide gives off an odor similar to____. ✔✔rotten eggs
3 diseases potentially carried by wastewater are _____. ✔✔typhoid fever, disentery, cholera
Immediate first aid for butrns is to ____. ✔✔flood with cold water
What most likely causes an electic motor failure? ✔✔mopisture
What mixed liquor characteristics indicate a healthy activated sludge process? ✔✔brown color,
frothy appearance, and musty odor
T/F: Algae is a plant life necessary for the proper functioning of a stabilization or oxidation
pond. ✔✔True
Chlorine gas is ? ✔✔heavier than air
T/F: The highest concentration of algae growth in a facultative lagoon is usually observed near
the top. ✔✔True
Common hydraulic detention times for primary clarifiers range from ____ hours ✔✔2 - 3 hours
T/F: Methane is produced in an anaeroibic digester and can be used as a fuel? ✔✔True
T/F: The rock in a trickling filter is usually placed on a tile underdrain system. ✔✔True
What is the purpose of heating and mixing a primary anaeroibic digester? ✔✔to increase the
digestion rate
T/F: Exhaust from a chlorinator room should be taken form floor level. ✔✔True
T/F: Chlorine residual may be determined using the reagent _____ ✔✔diethyl-p-phenylene
diamine (DPD)
What test is typically never performed on wastewater influent? ✔✔fecal coliform
Considering the layout and flow diagram for the complete treament plant, oxidation ditch plants
would be most similar to _____? ✔✔extended aeration
The pressure against which a pump must operate is measured in terms of _____ ✔✔kPA (psi)
T/F: Assuming aa constant suction head, the discharge of a centrifugal pump decreases with an
increase in discharge head. ✔✔True
T/F: The addition of chlorine, acid, carbon dioxide, or sulfuric acid will "lower" the pH of
wastewater? ✔✔True
T/F: Activated sludge generally "settle more slowly" than raw sludge. ✔✔True
T/F: Controlling the sludge wasting rate by constant MLSS concentration involves maintaining a
certain concentration of "volatile suspended solids in the reactor(aeration tanks) ✔✔True
T/F: "Fungi" organisms should mot be present in a healthy lagoon treament system ✔✔True
T/F: Under ice and snow cover, the BOD level in poinds will mormally "increase slowly".
✔✔True
T/F: The rotational speed of the air-driven rotating biological contactor (RBC) is controlled by
"air volume". ✔✔True
T/F: chloramines are "combined chlorine." ✔✔True
T/F: An "increase in organic matter" increases chlorine demand. ✔✔True
When a high organic waste load reaches an activated sludge plant, the operator's first indicator is
a decrease in ✔✔DO residual in the reactors (aeration tanks)
Disaster planning is ____ ✔✔useful in reducing confusion in the event of a disaster.
The gas most commonly associated with septic wastewater is ✔✔hydogen sulfide
In electrical circuits, a ______ is used to reduce the voltage where necessary. ✔✔transformer
What causes the greatest pipe friction loss? ✔✔Increasing the velocity of wastewater
T/F: Denitrification is the most likely cause of rising sludge in clarifiers. ✔✔True
The amount of BOD in sludge entering a digester is an indirect measure of the ✔✔"food"
available for bacteria in the digester.
Chemical coagulation doses can be initially estimated by ✔✔jar tests.
An incubator for the BOD test should be controlled at ____C. ✔✔30 degrees
In certain situations, a supervisor encourages the employees to make their own decisions. This is
considered to be ______ ✔✔highly desirable because it encourages employee growth and frees
the supervisor for other tasks
What peeice of lab equipment should be calibrated daily at a treament plant? ✔✔portable
dissoved oxygen probe
The ask content remaining at the end of a VSS test is the same as the ____. ✔✔inorganic solids
A chlorine demand test will show the ______. ✔✔amount of chlorine required to give a desired
residual after a given time.
Jar tests may be used to determine the optimum dosage of ______. ✔✔polymer
Which activated sludge process ccould handle shock loads of dairy waste most effectively? ✔✔a
tapered aeration system
When chlorine reacts with hydrogen sulfide gas, the hydrogen sulfide is ______. ✔✔oxidized
and made odorless
T/F: in the membrane filter method, the number of coliforms is estimated by the _____.
✔✔number of coloniew grown
Decentralized authority describes the process of _______. ✔✔delegating power for decisions to
lower levels
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