WASTEWATER TEST SAMPLE EXAM
BANK EXPERT REVIEWED QUESTIONS
ANSWERS
◍ Most activated sludge mixed-liquor suspended solids fall into a range
of what percent volatile content for municipal waste when the process is
operating properly?
A. 5 to 15%
B. 30 to 40%
C. 50 to 70%
D. 70 to 80% Answer:D. 70 to 80%
◍ What may be the first corrective action taken to resolve floating
sludge conditions in a secondary clarifier, given these observations: -SVI
is 132; microscopic exam reveals abundance of filamentous organisms.
A. Decrease DO
B. Increase DO
C. Increase WAS rate
D. Reduce WAS rate Answer:B. Increase DO
◍ What is another term for organic solids?
,A. Volatile
B. Non-volatile
C. Dissolved
D. Soluble Answer:A. Volatile
◍ Which repair kit is designed for use with 150-pound chlorine
cylinders?
A. "A" kit
B. "B" kit
C. "C" kit
D. none of the above Answer:A. "A" kit
◍ If a gallon of water weight 8.34lbs and a cubic foot of water holds
7.48 gallons, how much does a cubic foot of water hold?
A. 92.4lbs
B. 89.6lbs
C. 62.4lbs
D. 3.14lbs Answer:C. 62.4lbs
◍ What is the best adjustment to make (from the list of possible
answers) if solids are rising in the secondary clarifier accompanied by
small gas bubbles and solids that break apart when they surface?
A. Increase aeration DO
,B. Decrease the RAS rate
C. Decrease the WAS rate
D. Decrease aeration DO Answer:A. Increase aeration DO
◍ Is a high-rate aeration process typically overloaded or under loaded
by design?
A. Overloaded
B. Underloaded
C. High MLSS
D. Low F/M ratio Answer:A. Overloaded
◍ What does the term aliquot mean?
A. Composite sample
B. Grab sample
C. The total volume of sample
D. A portion of a sample Answer:D. A portion of a sample
◍ What is another term for inorganic solids?
A. Volatile
B. Non-volatile
C. Dissolved
D. Soluble Answer:B. Non-volatile
, ◍ What is the common preservation method for a wastewater sample to
be tested for CBOD5?
A. Cool to 4 degrees C
B. Dechlorination
C. Acidification
D. Cool to 4 degrees F Answer:A. Cool to 4 degrees C
◍ In which form are nutrients better utilized by microorganisms in a
biological treatment process?
A. Particulate
B. Solid
C. Gaseous
D. Soluble Answer:D. Soluble
◍ Which of the following best describes the term anoxic?
A. High dissolved oxygen present
B. Nearly anaerobic; very low dissolved oxygen but nitrates and/or
nitrites are present
C. Completely anaerobic; there are no dissolved oxygen, nitrates or
nitrites
D. Nitrates are very low Answer:B. Nearly anaerobic; very low
dissolved oxygen but nitrates and/or nitrites are present
BANK EXPERT REVIEWED QUESTIONS
ANSWERS
◍ Most activated sludge mixed-liquor suspended solids fall into a range
of what percent volatile content for municipal waste when the process is
operating properly?
A. 5 to 15%
B. 30 to 40%
C. 50 to 70%
D. 70 to 80% Answer:D. 70 to 80%
◍ What may be the first corrective action taken to resolve floating
sludge conditions in a secondary clarifier, given these observations: -SVI
is 132; microscopic exam reveals abundance of filamentous organisms.
A. Decrease DO
B. Increase DO
C. Increase WAS rate
D. Reduce WAS rate Answer:B. Increase DO
◍ What is another term for organic solids?
,A. Volatile
B. Non-volatile
C. Dissolved
D. Soluble Answer:A. Volatile
◍ Which repair kit is designed for use with 150-pound chlorine
cylinders?
A. "A" kit
B. "B" kit
C. "C" kit
D. none of the above Answer:A. "A" kit
◍ If a gallon of water weight 8.34lbs and a cubic foot of water holds
7.48 gallons, how much does a cubic foot of water hold?
A. 92.4lbs
B. 89.6lbs
C. 62.4lbs
D. 3.14lbs Answer:C. 62.4lbs
◍ What is the best adjustment to make (from the list of possible
answers) if solids are rising in the secondary clarifier accompanied by
small gas bubbles and solids that break apart when they surface?
A. Increase aeration DO
,B. Decrease the RAS rate
C. Decrease the WAS rate
D. Decrease aeration DO Answer:A. Increase aeration DO
◍ Is a high-rate aeration process typically overloaded or under loaded
by design?
A. Overloaded
B. Underloaded
C. High MLSS
D. Low F/M ratio Answer:A. Overloaded
◍ What does the term aliquot mean?
A. Composite sample
B. Grab sample
C. The total volume of sample
D. A portion of a sample Answer:D. A portion of a sample
◍ What is another term for inorganic solids?
A. Volatile
B. Non-volatile
C. Dissolved
D. Soluble Answer:B. Non-volatile
, ◍ What is the common preservation method for a wastewater sample to
be tested for CBOD5?
A. Cool to 4 degrees C
B. Dechlorination
C. Acidification
D. Cool to 4 degrees F Answer:A. Cool to 4 degrees C
◍ In which form are nutrients better utilized by microorganisms in a
biological treatment process?
A. Particulate
B. Solid
C. Gaseous
D. Soluble Answer:D. Soluble
◍ Which of the following best describes the term anoxic?
A. High dissolved oxygen present
B. Nearly anaerobic; very low dissolved oxygen but nitrates and/or
nitrites are present
C. Completely anaerobic; there are no dissolved oxygen, nitrates or
nitrites
D. Nitrates are very low Answer:B. Nearly anaerobic; very low
dissolved oxygen but nitrates and/or nitrites are present
