Chapter 14 Flashcards
The main purpose of a rotating biological contactor is to reduce the ___________ of the wastewater.
A) pH value
B) Toxicity
C) Temperature value
D) Acidity value
E) Biochemical oxygen demand
E
An anaerobic digester operates at an optimal temperature of:
A) 10°C
B) 100°C
C) 25°C
D) 20°C
E) 37°C
E
To allow for reasonable separation in an oil/water separation pond, a component of an industrial wastewater treatment plant, the separator should have sufficient capacity to hold the average flow for ____________.
A) 1 day
B) 30 days
C) 4 to 5 days
D) 1 to 2 days
E) 2 to 4 days
E
The shaft of a rotating biological contactor is mounted in such a way that ______ of the shaft is exposed to the air.
A) 30%
B) 50%
C) 40%
D) 10%
E) 20%
B
The bacteria in activated sludge needs ____________ to live.
A) Oxygen
B) Aluminum sulphate
C) Water
D) Salts
E) Sugar
A
The primary separation of sludge is facilitated by ____________.
A) Activated sludge
B) Rotating biological contactors
C) Pumps
D) Gravity
E) Chemicals
D
A rotating trash screen used in a wastewater treatment plant is also called a/an:
A) Barminutor
B) Accumulator
C) Constrictor
D) Comminutor
E) Compactor
D
The ____________ wastewater process involves changing the charge of the colloidal particles.
A) Floatation
B) Sedimentation
C) Coagulation
D) Flocculation
E) Clarifier
C
The process that uses air bubbles to cause suspended materials to float to the surface to be skimmed off:
A) Screen
B) Flare pit
C) Digester
D) Aeration tank
E) Flotation tank
E
_____________ mixed with the effluent of the wastewater heater to help breakdown the organic materials in the flow.
A) Activated sludge is
B) Steam is
C) Oils are
D) Activated chemicals are
E) Polishing chemicals are
A
