Unit 4: Wastewater Treatment

Question 1

Which of the following is NOT accomplished by wastewater treatment:
A: Removal of organic material
B: Replenishment of plant nutrients for receiving stream
C: Destruction or inactivation of pathologic organisms
D: Removal of harmful chemicals

Answer 1

B: Replenishment of plant nutrients for receiving stream

Question 2

Which of the following is NOT accomplished by wastewater treatment:
A: Removal of organic material
B: Replenishment of plant nutrients for receiving stream
C: Destruction or inactivation of pathologic organisms
D: Removal of harmful chemicals

Answer 2

B: Replenishment of plant nutrients for receiving stream

Question 3

True or False:
An animal rendering plant has more pathogenic organisms in its wastewater than a hospital

Answer 3

False
A hospital has more pathogenic organisms in its wastewater

Question 4

What is the characteristic colour and smell of a anaerobic wastewater

Answer 4

Black and foul smelling

Question 5

In raw wastewater, what percentage of dissolve solids is composed of colloidal solids?

Answer 5

0%

Colloidal solids are not filterable

Question 6

How does the release of nitrate and phosphate contribute to the death of fish and other organisms in the receiving stream?

Answer 6

Stimulates the growth of algae and plants

Question 7

What type or types of bacteria can break down organic content in oxygen-deficient wastewater

Answer 7

Both anaerobic bacteria and facultative bacteria

Question 8

For an isolated community of 500 people, what is the most efficient method of wastewater treatment

Answer 8

Sewage Lagoons (wastewater stabilization pond)

Question 9

What is the goal of wastewater prevention-treatment?
A: Removal of organic material
B: Removal of inorganic grit and floatables
C: removal of taste and odours
D:Production of high quality sludge

Answer 9

B: Removal of inorganic grit and floatables

Question 10

What stage of wastewater treatment, prior to aeration and biological treatment, involves the removal of settleable solids out of solution

Answer 10

Primary Treatment

Question 11

The tertiary process of wastewater treatment does what

Answer 11

Disinfection and and removal of inactive pathogenic microorganisms

Question 12

What happens to sludge that is collected from primary clarifiers

Answer 12

Pumped to anaerobic digestion tanks

Question 13

What is anaerobic treatment?

Answer 13

An energy-efficient process that reliably removes biochemical oxygen demand (BOD), chemical oxygen demand (COD), and total suspended solids (TSS) from wastewater.

Question 14

What happens to activated sludge during secondary treatment?

Answer 14

It is cycled through the stage to increase microbial content