Chemistry 16.9

Question 1

What is the primary purpose of wastewater treatment?

Answer 1

To remove contaminants and make water safe for discharge or reuse.

Question 2

True or False: Wastewater treatment only involves physical processes.

Answer 2

False

Question 3

What are the three main stages of wastewater treatment?

Answer 3

Primary, secondary, and tertiary treatment.

Question 4

Fill in the blank: Primary treatment primarily involves __________.

Answer 4

physical processes to remove solids.

Question 5

What is the role of bacteria in secondary wastewater treatment?

Answer 5

To break down organic matter.

Question 6

Multiple choice: Which of the following is NOT a method of tertiary treatment? A) Filtration B) Disinfection C) Sedimentation D) Nutrient removal

Answer 6

C) Sedimentation

Question 7

What is the purpose of disinfection in wastewater treatment?

Answer 7

To kill pathogens and make the water safe for discharge.

Question 8

True or False: Anaerobic digestion is a process used in secondary treatment.

Answer 8

True

Question 9

What is sludge in the context of wastewater treatment?

Answer 9

The solid waste that settles during the treatment process.

Question 10

What can tertiary treatment include to remove nutrients.

Answer 10

chemical processes

Question 11

What is the main disadvantage of using chlorine for disinfection?

Answer 11

It can form harmful by-products.

Question 12

Multiple choice: Which of the following is a common method for secondary treatment? A) Activated sludge B) Reverse osmosis C) Filtration D) Coagulation

Answer 12

A) Activated sludge

Question 13

What is the term for the process of separating solids from liquids in wastewater treatment?

Answer 13

Sedimentation

Question 14

True or False: Wastewater can be treated and reused for irrigation.

Answer 14

True

Question 15

What is a common indicator of water quality in treated wastewater?

Answer 15

Biochemical oxygen demand (BOD)

Question 16

What is often used to remove suspended solids in primary treatment.

Answer 16

Screening

Question 17

What is the purpose of aeration in wastewater treatment?

Answer 17

To introduce oxygen for bacteria to break down organic matter.

Question 18

Which processes are used to stabilize sludge?

Answer 18

Incineration, Composting, Anaerobic digestion

Question 19

What is the environmental impact of untreated wastewater?

Answer 19

It can contaminate water bodies and harm aquatic life.

Question 20

True or False: Wastewater treatment is only important in urban areas.

Answer 20

False

Question 21

What is the significance of nutrient removal in wastewater treatment?

Answer 21

To prevent eutrophication in receiving water bodies.

Question 22

What is a process that uses microorganisms to break down organic material in wastewater.

Answer 22

Biological treatment

Question 23

What is the term for the final step in wastewater treatment that ensures water meets quality standards?

Answer 23

Polishing

Question 24

Multiple choice: Which of the following is a benefit of wastewater treatment? A) Reduces pollution B) Conserves water C) Protects public health D) All of the above

Answer 24

D) All of the above

Question 25

What is the role of a clarifier in wastewater treatment?

Answer 25

To allow solids to settle and separate from the liquid.

Question 26

True or False: Wastewater treatment processes are the same worldwide.

Answer 26

False