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WASTEWATER OPERATOR CERTIFICATION STUDY GUIDE GRADE 1 QUESTIONS AND ANSWERS
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WASTEWATER OPERATOR CERTIFICATION STUDY GUIDE GRADE 1 QUESTIONS AND ANSWERS
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Name: Score:99 Multiple choice questions
Term 1 of 99
Basic WasteWater Treatment:
The biochemical oxygen demand (BOD) test usually has a specific time of
7 days
2 days
5 days
24 hours
Term 2 of 99
Primary Sedimentation:
According to CWA, secondary treatment is defines as a wastewater plant producing an
effluent that has no more than____total suspended solids and no more than_____BOD5
30 mg/L, 30 mg/L
10 mg/l, 10 mg/l
100 mg/l, 100 mg/l
50 mg/l, 50 mg/l
,Term 3 of 99
Basic Chemistry:
What acids are formed when water reacts with nonmetal oxides?
a. acid hydroxides
b. acid anhydrides
c. acid oxides
d. acid hydrates
anaerobic
acid anhydrides
sodium nitrate
storm events
Term 4 of 99
WasteWater Sources & Characteristics:
Generally, the % of dissolved solids in the amount of total solids is about
30%
80%
70%
50%
Term 5 of 99
Basic WasteWater Treatment:
The major gas produces by anaerobic decomposition is
chlorine
methane
carbon monoxide
oxygen
,Term 6 of 99
Safety:
Which one of the following gases is least likely to collect in a below-ground vault?
sulfur dioxide
carbon monoxide
chlorine
methane
Term 7 of 99
Disinfection:
The fusible plug on a chlorine cylinder will start to melt at approximately?
159 degree F
155 degree F
160 degree F
45-60 degrees
Term 8 of 99
Phosphorus Removal:
That is the main reason why wastewater treatment plants remove phosphorous from their
effluent before discharging to a lake or river?
volume of settleable solids
the reduce the growth of algae
oxygen
sedimentation
, Term 9 of 99
Odor Control:
What would be the most likely solution in the influent to a wastewater treatment plant has an
H2S order?
the reduce the growth of algae
airstream treatment
add treatment chemicals
correct faulty plant operation
Term 10 of 99
Basic Chemistry:
Which one of the following is not a hydrate:
a. alum
b. blue nitrate
c. sodium nitrate
d. ferrous sulfate
storm events
sodium nitrate
stalked cilates
sedimentation
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