Here we go!
Turbidity in wastewater is caused by:
A. finely divided suspended material
B. dissolved calcium
C. Water Hardness
D. Water Color
What is A. Finely divided suspended material
Three waterborne diseases are:
A. mumps, measles, colds
B. scarlet fever, pneumonia, hay fever
C. typhoid fever, dysentery, cholera
D. TB, diptheria, chickenpox
What is: C typhoid fever, dysentery, cholera
One gram of sludge; or domestic waste is what percent water?
A. 100%
B. 75%
C. 80%
D. 99.9%
What is (D) 99.9% water
After wastewater is treated in activated sludge the BOD demand _______.
A. remains constant
B. decreases
C. increases
D. alters
The answer is (B), after the treatment, the bod demand decreases. BOD stands for biological oxygen demand and COD stands for chemical oxygen demand.
What may be the most common cause of filamentous bulking in a secondary clarifier?
A. low d.o.
B. high d.o.
C. low sludge age
D. high return rates
The answer is (A) low d.o. (dissolved oxygen). filamentous bulking is typically caused by a low d.o. and low food availability or low F/M.
Dark tan and shiny foam is produced when:
A. f/m ratio is too low
B. insufficient aeration tank capacity
C. young sludge
D. RAS rate is inappropriate
What is A. F/M ratio is too low
Means the system is approaching an under loaded condition (high mlss) due to insufficient or lack of wasting.
Coliform bacteria are:
A. algae
B. Coagulant aids
C. indicators
D. sequestering agents
What is : C indicators
Trickling filter efficiency is decreased as the wastewater temperature applied is _____ (increased, decreased or stays the same)
What is decrease?
Which is the next tank (reactor) after activated sludge basin in the treatment process?
A. flocculation unit
B. aeration unit
C. clarifier
D. disinfection unit
The answer is (C) the clarifier or settling tank is the next reactor where the solids are separated from the water. The system is commonly operated in continuous mode as opposed to a batch mode.
The aeration tank is approaching under loaded conditions (high mlss) because of old sludge in the system. The expected conditions seen in the final clarifiers would be?
A. straggler floc
B. pin floc
C. fluffy, slow settling sludge
D. slow settling sludge leaving a very clear supernatant
The correct answer is (B) pin floc
The pH of wastewater:
A. always increases as acid concentrations increase
B. always increases when wastewater becomes septic
C. is measured on a scale of 0 to 14
D. is measured on a scale of 0 to 100 mg/L
What is : C measured on a scale of 0 to 14
Organic solids in wastewater are:
A. generally of vegetable and animal orgin
B. inert and not subject to decay
C. mostly floatable solids
D. always settleable solids
What is A. generally of vegetable and animal orgin
Grit channels are basically long channels that reduce flow velocity to ____ feet per second?
A. 10 fps
B. 1.0 fps
C. 2.0 fps
D. 2.5 fps
What is (B) 1 fps
An activated sludge unit consists of two components, an aerator and ________.
A. screening units
B. disinfection unit
C. flocculation unit
D. clarifier
The answer is (d) aerator and clarifier are the two components present in activated sludge systems. An activated sludge system consists of two components such as aerator and clarifier.
The trickling filter plant is experiencing large amounts of filter flies and odors. Best method to correct the problem? f
A. increase distributor arm speed
B. increase recirculation flow rate
C. decrease recirculation flow rate
D. decrease filter media sloughing potential
What is: Increase recirculation flow rate
Sand, silt, and grit are composed of what kind of matter?
A. colloidal
B. inorganic
c. organic
D.volatile
What is: B inorganic
The purpose of primary sedimentation is to remove:
A. pathogenic bacteria
B. roots, rags, cans, and large debris
C. sand and gravel
D. settleable and floatable material
What is: D settleable and floatable material
What is it called when a reduced level of respiration occurs where organisms break down compounds within their own cells or make up to produce the oxygen they need?
Consume each other.
What is endogenous respiration?
A low f/m, high mcrt, low SVI, and high mlss concentrations are all characteristic of:
A. bulking sludge B. young sludge
C. old sludge D. none of the above
What is C: old sludge
indicator organisms (bugs) for old sludge would be seen in a microscope as:
A. amoebae and flagellates
B. rotifiers and worms
C. stalked ciliates and free swimming ciliates
The correct answer is (B) rotifiers and worms
A chlorine leak can be detected by:
A. an explosimeter
B. checking the leak gauge
C. spraying water on suspected leaks
D. a white cloud in presence of ammonia fumes
What is D. a white cloud in presence of ammonia fumes.
One cubic foot of water contains how many gallons?
A. 2.31 gallons
B. 7.48 gallons
C. 8.34 gallons
D. 10 gallons
What is: B 7.48 gallons
______ lbs of oxygen are required to convert 1 lb of BOD. And ______ lbs of oxygen are required to convert 1 lb of ammonia.
A. 1.5 lbs and 4.6 lbs
B. 2.0 lbs and 1.5 lbs
C. 4.6 lbs and 2.0 lbs
The answer is (A) 1.5 lbs of oxygen to convert 1 lb of bod and 4.6 lbs of oxygen to convert 1 lb of ammonia.
Excessive white, billowing foam in the aeration tank surface. Most probable cause?
A. pH too high
B. Mlss too low
C. waste temperature too high
D. Was too low
B. MLss too low
The safety procedure that requires that an energy source be turned off and locked, and that information describing why a system is shut down is displayed on a tag is called what?
What is lock-out/tag-out?