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Wastewater Operator certification Study Guide-Grade 2
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Wastewater Operator certification Study Guide-Grade 2
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Name: Score:197 Multiple choice questions
Term 1 of 197
Disinfection:
If there is a leak from a valve on a sulfur dioxide tank and the lead is found using ammonia,
what color will the vapor fumes be?
white
green
red
purple
Term 2 of 197
Wastewater Solids Processing:
Which one of the following is not a major solids treatment method?
. thickening
. concentration
/ dewatering
. stabilization
,Term 3 of 197
Effluent Disposal:
Because water samples sometimes require repeat or backup tests, the amount of sample that
should collected for samples that are preserved and transported for any particular analysis
should be at least____times the amount for those analysis
one
five
three
two
Term 4 of 197
Safety:
What class of fire involves sodium and magnesium?
potassium
class D
1.29 g/L
carbon dioxide
Term 5 of 197
Sludge Digestion & Solids Handling:
what would be the best solution if the volatile-acid-to-alkalinity ratio increased to 0.3 in a
digester due to pumping thin sludge?
rotifers
suspend the addition of seed sludge
thicken the raw sludge
reduce the feeding rate
,Term 6 of 197
Activated Sludge:
What substance can cause obstructions in the sewer system and may cause anaerobic
decomposition where the substances accumulate?
heavy metals
oils and greases
flammable oils
settleable solids
Term 7 of 197
Sludge Digestion & Solids Handling:
Bacteria in an anaerobic digester will effectively utilize:
hair
mineral oils
gasoline products
fats
Term 8 of 197
Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
pressure gauge
venturi meter
weir gate
parshall flume
, Term 9 of 197
Residual Solids Management:
In general, secondary sludges:
contain 20-25% nonvolatile inorganic matter
are more fibrous
has less flocculant than primary sludges
have a density significantly greater than water
Term 10 of 197
Wastewater Solids Processing:
A solids treatment stabilization process method would be:
flotation
gravity
vacuum filters
incineration
Term 11 of 197
Sludge Digestion & Solids Handling:
If a wastewater treatment plant has four aerobic digesters operated in series, which tank will
exert the highest oxygen demand?
first tank
basket centrifuge
second tank
third tank
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