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WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 1 QUESTIONS AND ANSWERS
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WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 1 QUESTIONS AND ANSWERS
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Name: Score:79 Multiple choice questions
Term 1 of 79
Which of the following is true about trickling filters?
It is mostly an anaerobic process
The three main parts of a trickling filter are media, distribution system, and underdrain
In computing BOD loading, it is standard practice to include the BOD of the re-
circulated effluent
Filter ponding is usually due to inadequate organic loading
Term 2 of 79
A grab sample is most suited for these constituents
BOD
TSS
Suspended Solids Concentration
Residual Chlorine
Term 3 of 79
What must you do before entering a room with harmful concentration of chlorine gas in the
air?
Read the O&M manual
Wear self-contained breathing apparatus (SCBA)
Prepare the fire extinguishers
Cover your mouth and spray aqueous ammonia in the room.
,Term 4 of 79
The best way to evaluate the effluent TSS concentration from a plant is to
Check the grab sample at peak flow
Check the composite sample of TSS
Check the grab sample at low flow
Check the grab sample during average flow
Term 5 of 79
What type of microorganisms can use nitrate as a source of oxygen?
Aerobic bacteria
Anaerobic bacteria
Facultative bacteria
Zoogleal
Term 6 of 79
Which flowrate should you use to calculate the hydraulic loading to a trickling filter?
Plant inflow
Plant inflow minus recirculated flow
Plant inflow plus recirculated flow
Recirculated flow
Term 7 of 79
What is the typical removal efficiency of settable solids in a primary clarifier?
95 to 99%
40 to 60%
20 to 50%
10 to 15%
,Term 8 of 79
What creates hydrogen sulfide?
Excessive aeration
Surface active agents
Organic matter under aerobic condition
Decomposing organic matter under anaerobic condition
Term 9 of 79
What is the purpose of a Parshall flume?
measure turbidity
measure flowrate
measure settling rate
measure solids content
Term 10 of 79
What is the main reason for preventing a direct connection between potable water pipe and a
stuffing box (packings) of a wastewater pump?
Wears out the glands quicker
Glands should not be wet
Potable water will rapidly destroy the stuffing box
Cross Connection
Term 11 of 79
How will algae impact the chlorine demand in the pond effluent?
Slightly decreases chlorine demand
Does not affect chlorine demand
Significantly decreases chlorine demand
Increases chlorine demand
, Term 12 of 79
Which of the following enters the headworks of a treatment plant?
Effluent
Supernatant
WAS
Influent
Term 13 of 79
What is the purpose of the grit channel?
Remove dissolved and non-settleable organics
Remove heavy inorganic wastes
To allow activated sludge to settle
Remove substances that float and readily settle from the wastewater as part of primary
treatment
Term 14 of 79
If a primary clarifier is placed out of service, then how should a plant with at least two trickling
filters operate the system?
Operate the filters in parallel
Divert the influent to several trickling filters
Operate the filters in series
Maintain existing operation without changing filter arrangement
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