BASIC WASTEWATER D EXAM
QUESTIONS WITH CORRECT
ANSWERS
Chlorine helps ________ grease, making it easy to skim.
a. melt
b. oxidize
c. float
d. congeal - Answer-d
EPA requires some industries to pretreat waste before discharge to a ________.
a. POWT
b. PTOW
c. POTW
d. PWTO - Answer-c
If the trench is ________ feet or deeper, a means of exit is required.
a. 7
b. 6
c. 5
d. 4 - Answer-d
Imhoff tanks are ________ story units with ________ compartments.
a. 3/2
b. 3/3
c. 2/3
d. 2/2 - Answer-c
Solids include total, suspended, dissolved, settleable, inorganic, organic, and soft
and hard solids.
,a. true
b. false - Answer-a
14. The TCEQ may revoke a license if the operator ________.
a. violates the permit
b. falsifies records
c. neglects a duty
d. all of the above - Answer-d
________ settles gently and uniformly, compacts slowly, and has sharp edges like a
sponge.
a. quality sludge
b. Old sludge
c. Young sludge
d. Bulky sludge - Answer-a
Final disposal of grit, screenings, and grease is by burial in a ________.
a. landfill
b. compost
c. park
d. garden - Answer-a
If a ladder is used, it must be portable and extend ________ feet above the trench,
in addition to being secured.
a. 2
b. 3
c. 4
d. 5 - Answer-b
The ________ compartment of an Imhoff tank is the settling tank, and the ________
compartment is the sludge digester.
a. upper/lower
,b. lower/upper
c. digester/settling
d. second/first - Answer-a
The most important problem prevented by monitoring or restricting industrial waste is
________.
a. sludge contamination
b. worker exposure
c. effluent pollutants
d. wastewater fires - Answer-b
When an accidental discharge, bypass, or spill occurs, the discharger must notify the
TCEQ within ________ hours.
a. 24
b. 36
c. 48
d. 72 - Answer-a
A ladder must be within ________ feet of anyone in the trench.
a. 25
b. 24
c. 23
d. 22 - Answer-a
An administrative penalty can be up to ________ per day.
a. $5,000
b. $10,000
c. $25,000
d. $50,000 - Answer-c
, Federal regulations require cities to have an industrial waste control program when
________.
a. flow exceeds 5 MGD and industrial waste is regulated by federal standards
b. flow exceeds 0.5 MGD and any industry discharges waste
c. flow exceeds 50 MGD and industrial waste is regulated by federal standards
d. none of the above - Answer-a
Gas vents alongside the settling tank are the ________ compartment.
a. first
b. second
c. third
d. fourth - Answer-c
Pre-aeration is used to remove grit, reduce ________, add oxygen, and promote
grease flotation.
a. chlorine
b. pH
c. gases
d. temperature - Answer-c
Settleable solids are dissolved solids of sufficient weight to settle when left standing
for a time.
a. true
b. false - Answer-b
The ________ modification of the activated sludge process has no primary clarifier,
no digester, 24-hour aeration time, a low F/M ratio, and complete nitrification.
a. conventional process
b. extended aeration
c. contact stabilization
d. none of the above - Answer-b
QUESTIONS WITH CORRECT
ANSWERS
Chlorine helps ________ grease, making it easy to skim.
a. melt
b. oxidize
c. float
d. congeal - Answer-d
EPA requires some industries to pretreat waste before discharge to a ________.
a. POWT
b. PTOW
c. POTW
d. PWTO - Answer-c
If the trench is ________ feet or deeper, a means of exit is required.
a. 7
b. 6
c. 5
d. 4 - Answer-d
Imhoff tanks are ________ story units with ________ compartments.
a. 3/2
b. 3/3
c. 2/3
d. 2/2 - Answer-c
Solids include total, suspended, dissolved, settleable, inorganic, organic, and soft
and hard solids.
,a. true
b. false - Answer-a
14. The TCEQ may revoke a license if the operator ________.
a. violates the permit
b. falsifies records
c. neglects a duty
d. all of the above - Answer-d
________ settles gently and uniformly, compacts slowly, and has sharp edges like a
sponge.
a. quality sludge
b. Old sludge
c. Young sludge
d. Bulky sludge - Answer-a
Final disposal of grit, screenings, and grease is by burial in a ________.
a. landfill
b. compost
c. park
d. garden - Answer-a
If a ladder is used, it must be portable and extend ________ feet above the trench,
in addition to being secured.
a. 2
b. 3
c. 4
d. 5 - Answer-b
The ________ compartment of an Imhoff tank is the settling tank, and the ________
compartment is the sludge digester.
a. upper/lower
,b. lower/upper
c. digester/settling
d. second/first - Answer-a
The most important problem prevented by monitoring or restricting industrial waste is
________.
a. sludge contamination
b. worker exposure
c. effluent pollutants
d. wastewater fires - Answer-b
When an accidental discharge, bypass, or spill occurs, the discharger must notify the
TCEQ within ________ hours.
a. 24
b. 36
c. 48
d. 72 - Answer-a
A ladder must be within ________ feet of anyone in the trench.
a. 25
b. 24
c. 23
d. 22 - Answer-a
An administrative penalty can be up to ________ per day.
a. $5,000
b. $10,000
c. $25,000
d. $50,000 - Answer-c
, Federal regulations require cities to have an industrial waste control program when
________.
a. flow exceeds 5 MGD and industrial waste is regulated by federal standards
b. flow exceeds 0.5 MGD and any industry discharges waste
c. flow exceeds 50 MGD and industrial waste is regulated by federal standards
d. none of the above - Answer-a
Gas vents alongside the settling tank are the ________ compartment.
a. first
b. second
c. third
d. fourth - Answer-c
Pre-aeration is used to remove grit, reduce ________, add oxygen, and promote
grease flotation.
a. chlorine
b. pH
c. gases
d. temperature - Answer-c
Settleable solids are dissolved solids of sufficient weight to settle when left standing
for a time.
a. true
b. false - Answer-b
The ________ modification of the activated sludge process has no primary clarifier,
no digester, 24-hour aeration time, a low F/M ratio, and complete nitrification.
a. conventional process
b. extended aeration
c. contact stabilization
d. none of the above - Answer-b
