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WASTEWATER/PRACTICE EXAM QUESTIONS
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WASTEWATER/PRACTICE EXAM QUESTIONS
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WASTEWATER/PRACTICE EXAM QUESTIONSWhen organic wastes are discharged to receiving waters, O2 is depleted by _____. -
Answers -bacteria
Hydrogen sulfide gives off an odor similar to____. - Answers -rotten eggs
T/F: The highest concentration of algae growth in a facultative lagoon is usually
observed near the top. - Answers -True
Common hydraulic detention times for primary clarifiers range from ____ hours -
Answers -2 - 3 hours
T/F: Methane is produced in an anaeroibic digester and can be used as a fuel? -
Answers -True
T/F: The rock in a trickling filter is usually placed on a tile underdrain system. - Answers
-True
What is the purpose of heating and mixing a primary anaeroibic digester? - Answers -to
increase the digestion rate
T/F: Exhaust from a chlorinator room should be taken form floor level. - Answers -True
T/F: Chlorine residual may be determined using the reagent _____ - Answers -diethyl-p-
phenylene diamine (DPD)
What test is typically never performed on wastewater influent? - Answers -fecal coliform
3 diseases potentially carried by wastewater are _____. - Answers -typhoid fever,
disentery, cholera
Immediate first aid for butrns is to ____. - Answers -flood with cold water
What most likely causes an electic motor failure? - Answers -mopisture
What mixed liquor characteristics indicate a healthy activated sludge process? -
Answers -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. - Answers -True
Chlorine gas is ? - Answers -heavier than air
Considering the layout and flow diagram for the complete treament plant, oxidation ditch
plants would be most similar to _____? - Answers -extended aeration
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