What mixed liquor characteristics indicate a healthy activated sludge process?
brown color, frothy appearance, and musty odor
T/F: Algae is a plant life necessary for the proper functioning of a stabilization or oxidation pond.
T/F: The highest concentration of algae growth in a facultative lagoon is usually observed near the top.
What is the purpose of heating and mixing a primary anaeroibic digester?
to increase the digestion rate
Considering the layout and flow diagram for the complete treament plant, oxidation ditch plants would be most similar to _____?
T/F: Assuming aa constant suction head, the discharge of a centrifugal pump decreases with an increase in discharge head.
T/F: The addition of chlorine, acid, carbon dioxide, or sulfuric acid will "lower" the pH of wastewater?
T/F: Controlling the sludge wasting rate by constant MLSS concentration involves maintaining a certain concentration of "volatile suspended solids in the reactor(aeration tanks)
T/F: The rotational speed of the air-driven rotating biological contactor (RBC) is controlled by "air volume".
When a high organic waste load reaches an activated sludge plant, the operator's first indicator is a decrease in
DO residual in the reactors (aeration tanks)
The amount of BOD in sludge entering a digester is an indirect measure of the
"food" available for bacteria in the digester.
In certain situations, a supervisor encourages the employees to make their own decisions. This is considered to be ______
highly desirable because it encourages employee growth and frees the supervisor for other tasks
What peeice of lab equipment should be calibrated daily at a treament plant?
portable dissoved oxygen probe
A chlorine demand test will show the ______.
amount of chlorine required to give a desired residual after a given time.
Which activated sludge process ccould handle shock loads of dairy waste most effectively?
a tapered aeration system
When chlorine reacts with hydrogen sulfide gas, the hydrogen sulfide is ______.
oxidized and made odorless
T/F: in the membrane filter method, the number of coliforms is estimated by the _____.
number of coloniew grown