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WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 2 QUESTIONS AND ANSWERS
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WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 2 QUESTIONS AND ANSWERS
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Name: Score:80 Multiple choice questions
Term 1 of 80
What could have happen if the volatile acid/alkalinity ratio starts to increase, and corrective
action is not taken immediately?
Carbon dioxide content in the digester gas will decrease
Carbon monoxide content in the digester gas will fluctuate
pH of the digester sludge will increase
Carbon dioxide content in the digester gas will increase
Term 2 of 80
What is sludge age?
An expression of the average time that a microorganism will spend in the activated
sludge process, and calculated using total suspended solids removed from the process
A measure of food provided to bacteria in an aeration tank
The theoretical time required for water to pass through a tank at any given flowrate
A rough indicator of the length of time a pound of solids is maintained under aeration
Term 3 of 80
What causes primary effluent to become black and odorous?
Excessive sludge pumping
Oil leak from the sludge pump
Crack in the launder
Improper sludge removal from the clarifier
,Term 4 of 80
Which of the following is not true about chlorine gas?
2.5 times heavier than air
Extremely toxic
Common chlorine gas concentration at the treatment plants is 12.5%
Corrosive in moist atmosphere
Term 5 of 80
What is a chloramine?
Free chlorine
A chemical that is formed when chlorine reacts with iron
Combined chlorine- a chemical that is formed when chlorine reacts with ammonia
A chemical that is formed when chlorine reacts with air.
Term 6 of 80
What is an air gap?
A distance between blowers in an activated sludge system
The vertical distance between the surface of wastewater and the top of basin
Backflow prevention
Type of aeration equipment
Term 7 of 80
What is the two categories of coliform bacteria?
Lactose and lauryl tryptose
Primary and secondary
Free swimming and stalked
Total and Fecal
,Term 8 of 80
What is used to control filamentous organisms?
Polymer
Sulfur Dioxide
Coagulant
Chlorine
Term 9 of 80
What type of disinfection is gaining popularity, and expected to become a practical alternative
to chlorination?
Sulfur dioxide
Ultraviolet (UV) disinfection
Aqueous ammonia
Caustic soda
Term 10 of 80
What does the "F" in F/M ratio represent?
The microorganism population in the aeration tank
The amount of filamentous bacteria in the activated sludge process
The MLVSS in the aeration tank
The food for the microorganisms flowing into the aeration tank, in lbs/day
, Term 11 of 80
What should be done to find a small chlorine leak?
Spray hypocloric acid near the suspected leak
Tie a rag on a stick, dip the rag in a strong ammonia solution, and hold the rag near the
suspected points
Release carbon dioxide to trace the leak
Apply a small quantity of citric acid near the leak
Term 12 of 80
What happens when there is more food in the influent to the aeration tank?
Less oxygen is required in the aeration tank
More oxygen is required in the aeration tank
Less organism activity takes place
Less oxidation takes place
Term 13 of 80
Which toxic gas is commonly found in septic wastewater and smells like rotten eggs?
Hydrogen Sulfide
Carbon monoxide
Hydrogen
Carbon Dioxide
Term 14 of 80
Which of the following is a collection of individual samples obtained at regular intervals?
Grab
Culmination
Comprehensive
Composite
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