3B2 Ch 14

Question 1

In a wastewater treatment plant, where are inlet samples taken from?
Select one:

a.
Flare pit

b.
Stabilization lagoon

c.
Headworks

d.
Oil/filter separator

e.
Clarifier

Answer 1

c.
Headworks

Question 2

B2C14Q31 When coagulant is used, primary clarifiers remove ___________ of the biochemical oxygen demand.
Select one:

a.
50% to 75%

b.
60% to 90%

c.
25% to 40%

d.
50% to 60%

Answer 2

d.
50% to 60%

Question 3

B2C14Q70 Like chlorine and oxygen, calcium hypochlorite is:
Select one:

a.
Highly combustible

b.
A powerful oxidizer

c.
A powerful disinfectant

d.
Gaseous

Answer 3

b.
A powerful oxidizer

Question 4

B2C14Q37 Secondary clarifier sludge is less compact and dense than primary clarifier sludge.
Select one:

a.
True

b.
False

Answer 4

a.
True

Question 5

What is the lower pH limit for wastewater?
Select one:

a.
5.5

b.
6.0

c.
6.5

d.
7.0

e.
7.5

Answer 5

c.
6.5

Question 6

A wastewater treatment process that involves changing the charge of colloidal particles is called:
Select one:

a.
Coagulation

b.
Floatation

c.
Flocculation

d.
Sedimentation

e.
Clarification

Answer 6

c.
Flocculation

Question 7

B2C14Q13 The waste-water flows from the preliminary treatment area to the primary clarifier through:
Select one:

a.
A nutating disk

b.
A parshall flume

c.
A rotameter

d.
An orifice plate

Answer 7

b.
A parshall flume