More Wastewater Treatment Questions
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Matching: A predominance of these microorganisms indicates |
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1. Amoeba |
A. Fast settling biomass and pin floc |
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2. Flagellates |
B. Good settling biomass |
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3. Ciliates |
C. Slow settling biomass and stragglers |
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4. Rotifers |
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5. Nematodes |
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Which of the following are associated with ashing in the final clarifier(s) of an activated sludge plant?
Variable High Low F : M
SRT MCRT Sludge Age Foam on AT White Dark Protozoa Amoeba Rotifers
Chlorine ton cylinders at room temperature will deliver gas at a maximum rate of
150 lb cylinders Ton Containers
A. 10 pounds per day 100 pounds per day
B. 25 pounds per day 250 pounds per day
C. 40 pounds per day 450 pounds per day
D. 150 pounds per day 2000 pounds per day
Which of the following lab tests is used to determine the total amount of nitrogen in our effluent?
A. TN
B. TKN
C. NO3
D. NH3
According to USEPA, the standard secondary removal efficiency is
A. 15%
B. 30%
C. 85%
D. 95%
A special thanks to Courtney Cswercko, Iowa DNR, for her presentation at the March 6, 2009 AceOps Annual Conference in Council Bluffs, IA!!! Her presentation is the source of this question.
The maximum holding time for e. Coli samples according to Standard Methods is
A. 30 minutes
B. 60 minutes
C. 6 hours
D. 36 hours
A special thanks to Courtney Cswercko, Iowa DNR, for her presentation at the March 6, 2009 AceOps Annual Conference in Council Bluffs, IA!!! Her presentation is the source of this question.
Which of the following is used for process control for activated sludge?
A. MCRT
B. Surface settling rate
C. Volatile acids to alkalinity ratio
D. Weir overflow rate
What is the minimum recommended velocity in non-aerated grit chambers?
A. 0.2 fps
B. 1 fps
C. 2 fps
D. 10 fps
A settleometer is used to measure
A. Rate of settling in a final clarifier
B. Rate of settling in a primary clarifier
C. Sludge depth in a final clarifier
D. Sludge depth in a primary clarifier
Which of the following valves only permits flow to move in one direction?
A. Butterfly
B. Check
C. Gate
D. Plug
The specific gravity of a colloidal solid is very close to 1. This means that the colloid
A. Will float within an hour
B. Will settle within an hour
C. Won't settle or float
The specific gravity of a settleable solid is
A. 1
B. Greater than 1
C. Less than 1
The specific gravity of a floatable solid is
A. 1
B. Greater than 1
C. Less than 1
The specific gravity of chlorine gas is
A. 1
B. Greater than 1
C. Less than 1
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Matching |
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1. Calcium |
A. C |
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2. Carbon |
B. S |
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3. Chlorine |
C. P |
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4. Copper |
D. K |
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5. Fluorine |
E. O |
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6. Iron |
F. Na |
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7. Hydrogen |
G. N |
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8. Lead |
H. Mg |
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9. Magnesium |
I. Ca |
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10. Manganese |
J. Cl |
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11. Nitrogen |
K. Cu |
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12. Potassium |
L. Mn |
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13. Sodium |
M. Fe |
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14. Oxygen |
N. H |
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15. Phosphorus |
O. Pb |
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16. Sulfur |
P. Fl |
Which of the following is correct?
A. A is the follower and B is the lantern ring
B. A is the lantern ring and B is a packing ring
C. A is a packing ring and B is the lantern ring
D. A is a packing ring and B is the follower
pH measures
A. H+
B. OH-
C. O2
D. Phosphorus
How do you know that your pump is cavitating?
A. It doesn't sound right
B. It runs hot
C. It won't start
D. All of the above
A chlorine atom is composed of
A. Electrons
B. Neutrons
C. Protons
D. All of the above
Throttling the discharge valve on a centrifugal pump will the likely ______ temperature of the motor and ______ the temperature of the pump
A. Increase, increase
B. Increase, reduce
C. Reduce, increase
D. Reduce, reduce
The chemical symbol for chlorine gas is
A. Cl
B. Cl-
C. Cl2
D. HOCl
Which of the following is the indicator used for pathogens?
A. Amoebic dysentery
B. E. coli
C. Salmonella typhosa
D. V. comma
Pump suction and discharge pressures are usually measured in
A. gpm
B. kWh
C. mg/L
D. psi
Which of the following is the correct formula for chlorine in water?
A. Cl2 + H2O → HOCl + HCl
B. NaOCl + H2O → HOCl + NaOH
C. Ca(OCl)2 + 2H2O → 2HOCl + Ca(OH)2
D. HOCl → H+ + OCl-
E. All of the above
Which of the following is the correct wavelength of UV for disinfection?
A. 253.7 nm
B. 372.5 nm
C. 537.2 nm
D. 725.3 nm
Which of the following describes flocculation?
A. Suspended solids that are too small to settle
B. Quiescent conditions that allow settleable solids to settle
C. Neutralizing charges
D. Growth of smaller solids into larger masses that will settle
Hypoxic zones are caused by high levels of
A. Colloidal suspended solids
B. Dissolved O2
C. Nitrogen & phosphorus
D. Pathogens
The PE for flow is _____ gpcd and PE for BOD is _____ lbs BOD/person/day.
A. 0.17 for both
B. 0.17 and 100
C. 100 and 0.17
D. 100 for both
What is the minimum recommended velocity in sanitary sewers?
A. 0.2 fps
B. 1 fps
C. 2 fps
D. 10 fps
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