1|Page
CWEA Wastewater Pretreatment Enforcement Exam
Practice Questions And Correct Answers||Verified
Exam!!|| (Verified Answers) Plus Rationale 2026/2027
Q&A| Instant Download Pdf
Which of the following types of wastewater would settling
occur most rapidly?
Cold wastewater
Old wastewater
Septic wastewater
Strong wastewater - Answer-Strong wastewater
The disadvantage of using a constant percentage return
activated sludge flow control is - Answer-Clarifier is
subjected to maximum solids loading when it contains
maximum amount of sludge
Under which conditions should sludge wasting normally be
increased? - Answer-A dark brown scummy foam appears
on the aeration tank surface
The outlet of a forced ventilation system for a chlorinator
room should be located - Answer-Near the floor
,2|Page
If packing is not maintained properly - Answer-There will
be a loss of suction from air being allowed to enter the
pipe.
Turbidity in wastewater is caused by - Answer-Finely
divided suspended material
One of the primary reasons why air should be excluded
from the digester is that... - Answer-The entrance of air
mixed with gas produced in the digester could create an
explosive mixture
True or False: Barminutors and comminutors are installed
for different purposes - Answer-False
What are the end products of the aerobic biochemical
reaction? - Answer-H2O and CO2
What does pump maintenance include?
a. Checking operating temperatures of bearings
b. checking packings glands
, 3|Page
c. lubricating the impeller
d. all of the above - Answer-all of the above
Pump packing should be - Answer-Tightened down to a
drip
The fusible plug that is in all chlorine containers?
a. May be used as a tap for the chlorine source
b. Should be removed after the cylinders are empty
c. Should never be removed or tampered with
d. Should be removed prior to withdrawing chlorine from
the container - Answer-Should never be removed or
tampered with
Floatable solids are easy to measure. True or False? -
Answer-False
A well operated digester normally receives sludge at about
__________% volatile solid and reduces it to about
________________% volatile solids. - Answer-70-75%,
25-30%
CWEA Wastewater Pretreatment Enforcement Exam
Practice Questions And Correct Answers||Verified
Exam!!|| (Verified Answers) Plus Rationale 2026/2027
Q&A| Instant Download Pdf
Which of the following types of wastewater would settling
occur most rapidly?
Cold wastewater
Old wastewater
Septic wastewater
Strong wastewater - Answer-Strong wastewater
The disadvantage of using a constant percentage return
activated sludge flow control is - Answer-Clarifier is
subjected to maximum solids loading when it contains
maximum amount of sludge
Under which conditions should sludge wasting normally be
increased? - Answer-A dark brown scummy foam appears
on the aeration tank surface
The outlet of a forced ventilation system for a chlorinator
room should be located - Answer-Near the floor
,2|Page
If packing is not maintained properly - Answer-There will
be a loss of suction from air being allowed to enter the
pipe.
Turbidity in wastewater is caused by - Answer-Finely
divided suspended material
One of the primary reasons why air should be excluded
from the digester is that... - Answer-The entrance of air
mixed with gas produced in the digester could create an
explosive mixture
True or False: Barminutors and comminutors are installed
for different purposes - Answer-False
What are the end products of the aerobic biochemical
reaction? - Answer-H2O and CO2
What does pump maintenance include?
a. Checking operating temperatures of bearings
b. checking packings glands
, 3|Page
c. lubricating the impeller
d. all of the above - Answer-all of the above
Pump packing should be - Answer-Tightened down to a
drip
The fusible plug that is in all chlorine containers?
a. May be used as a tap for the chlorine source
b. Should be removed after the cylinders are empty
c. Should never be removed or tampered with
d. Should be removed prior to withdrawing chlorine from
the container - Answer-Should never be removed or
tampered with
Floatable solids are easy to measure. True or False? -
Answer-False
A well operated digester normally receives sludge at about
__________% volatile solid and reduces it to about
________________% volatile solids. - Answer-70-75%,
25-30%
