WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
Wearing rings on a pump are used to _______________.
hold the impeller in place
wear out prior to pump failure
minimize internal leakage
hold the pump shaft in place - ANSWERS-C
Which of the following conditions will lead to the predominance of
Thiothrix bacteria in your activated sludge process?
low DO
low F:M
high ph
high sulfide levels - ANSWERS-D
A biotower is an alternative to what wastewater treatment process?
high-purity oxygen tank
activated sludge aeration basin
rotating biological contactor
trickling filter - ANSWERS-D
END OF
PAGE
1
, WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
Typically the presence of light, stiff, billowy white foam on the surface
of an aeration tank is an indicator of ________. Also what action should
you take to correct the problem?
low F:M, decrease wasting
high F:M, increase wasting
low F:M, increase wasting
high F:M, decrease wasting - ANSWERS-D
At temperatures less than _______, the rate of volatile solids reduction
drops so low that aerobic digestion processes are rendered ineffective.
20°C (68°F)
10°C (50°F)
40°C (104°F)
30°C (86°F) - ANSWERS-B
Calcium hypochlorite contains ___________% available chlorine.
85
65
END OF
PAGE
2
, WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
20
40 - ANSWERS-B
What type of respirator is needed when entering an IDLH (Immediately
Dangerous to Life or Health) atmosphere?
supplied air respirator or self-contained breathing apparatus (SCBA)
NIOSH-approved filtering facepiece
full-face cartridge respirator
powered air purifying respirator (PAPR) - ANSWERS-A
The precipitation of magnesium ammonium phosphate throughout an
anaerobic digester system is referred to as _______________.
scaling
decaying
crystallization
fouling - ANSWERS-A
Which of the following is a low-DO filament that is most likely to be
found under low F:M conditions?
END OF
PAGE
3
, WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
Nocardia
Sphaerotilus natans
Microthrix parvicella
H. hydrossis - ANSWERS-B
Which of the following forms of plant life is necessary for the proper
functioning of an aerobic/facultative stabilization or oxidation pond?
algae
weeds
water lilies
cattails - ANSWERS-A
The fecal coliform group is comprised of Escherichia coli and
____________.
A) streptococcu
B) Enterobactor
C) Klebsiella
D) Citrobacter - ANSWERS-C
END OF
PAGE
4
OHIO ABC PART 2
Wearing rings on a pump are used to _______________.
hold the impeller in place
wear out prior to pump failure
minimize internal leakage
hold the pump shaft in place - ANSWERS-C
Which of the following conditions will lead to the predominance of
Thiothrix bacteria in your activated sludge process?
low DO
low F:M
high ph
high sulfide levels - ANSWERS-D
A biotower is an alternative to what wastewater treatment process?
high-purity oxygen tank
activated sludge aeration basin
rotating biological contactor
trickling filter - ANSWERS-D
END OF
PAGE
1
, WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
Typically the presence of light, stiff, billowy white foam on the surface
of an aeration tank is an indicator of ________. Also what action should
you take to correct the problem?
low F:M, decrease wasting
high F:M, increase wasting
low F:M, increase wasting
high F:M, decrease wasting - ANSWERS-D
At temperatures less than _______, the rate of volatile solids reduction
drops so low that aerobic digestion processes are rendered ineffective.
20°C (68°F)
10°C (50°F)
40°C (104°F)
30°C (86°F) - ANSWERS-B
Calcium hypochlorite contains ___________% available chlorine.
85
65
END OF
PAGE
2
, WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
20
40 - ANSWERS-B
What type of respirator is needed when entering an IDLH (Immediately
Dangerous to Life or Health) atmosphere?
supplied air respirator or self-contained breathing apparatus (SCBA)
NIOSH-approved filtering facepiece
full-face cartridge respirator
powered air purifying respirator (PAPR) - ANSWERS-A
The precipitation of magnesium ammonium phosphate throughout an
anaerobic digester system is referred to as _______________.
scaling
decaying
crystallization
fouling - ANSWERS-A
Which of the following is a low-DO filament that is most likely to be
found under low F:M conditions?
END OF
PAGE
3
, WASTEWATER CLASS 2 LATEST
OHIO ABC PART 2
Nocardia
Sphaerotilus natans
Microthrix parvicella
H. hydrossis - ANSWERS-B
Which of the following forms of plant life is necessary for the proper
functioning of an aerobic/facultative stabilization or oxidation pond?
algae
weeds
water lilies
cattails - ANSWERS-A
The fecal coliform group is comprised of Escherichia coli and
____________.
A) streptococcu
B) Enterobactor
C) Klebsiella
D) Citrobacter - ANSWERS-C
END OF
PAGE
4
