Basics of Wastewater Treatment Quiz

Welcome to Basics of Wastewater Treatment Quiz

Test your knowledge of essential wastewater treatment concepts with this informative and engaging quiz.

1. What is the primary objective of wastewater treatment?

A) To generate electricity

B) To increase water hardness

C) To remove contaminants and pollutants

D) To desalinate seawater

2. Which of the following is considered a primary treatment process?

A) Activated sludge process

B) Grit removal

C) Chlorination

D) Reverse osmosis

3. What does BOD stand for?

A) Biodegradable Organic Density

B) Biological Oxygen Demand

C) Basic Oxygen Displacement

D) Biochemical Oxidation Design

4. Which treatment stage is mainly responsible for pathogen removal?

A) Preliminary

B) Primary

C) Secondary

D) Tertiary

5. Which of the following is a biological treatment process?

A) Sedimentation

B) Filtration

C) Activated Sludge

D) Coagulation

6. What is the typical range of BOD in domestic wastewater?

A) 5-10 mg/L

B) 200-300 mg/L

C) 1000-1200 mg/L

D) Less than 1 mg/L

7. What is the function of a bar screen in a treatment plant?

A) To add chemicals

B) To remove large solids

C) To disinfect water

D) To aerate the wastewater

8. Which of these is NOT a physical method of treatment?

A) Screening

B) Sedimentation

C) Aeration

D) Flocculation

9. Which parameter is used to measure the clarity of water?

A) COD

B) pH

C) Turbidity

D) TSS

10. Which of the following is a secondary treatment method?

A) Chlorination

B) Trickling filter

C) Screening

D) Filtration

11. What does TSS stand for?

A) Total Sewage Solids

B) Total Suspended Solids

C) Tertiary Solids Screening

D) Thermal Solids System

12. Why is aeration important in the activated sludge process?

A) To cool the wastewater

B) To increase flow rate

C) To supply oxygen for microbial activity

D) To remove heavy metals

13. What type of bacteria is primarily involved in secondary treatment?

A) Anaerobic

B) Pathogenic

C) Photosynthetic

D) Aerobic

14. Which of the following is considered a tertiary treatment method?

A) Grit Chamber

B) Activated Sludge

C) UV Disinfection

D) Primary Clarifier

15. Which unit operation removes grit from wastewater?

A) Aeration tank

B) Grit chamber

C) Trickling filter

D) Bar screen

16. Which substance is commonly used for chlorination in disinfection?

A) Sodium chloride

B) Sodium hypochlorite

C) Calcium carbonate

D) Ammonia

17. Which component is essential for sludge digestion?

A) Heat

B) Oxygen

C) Microorganisms

D) UV light

18. What is the main disadvantage of conventional activated sludge systems?

A) Requires large land area

B) High energy consumption for aeration

C) Very low treatment efficiency

D) Produces too much chlorine

19. What does the term “effluent” refer to?

A) Incoming raw sewage

B) Solids separated from water

C) Treated water leaving the plant

D) Chemicals added to wastewater

20. Which is the best method for removing nutrients like nitrogen and phosphorus?

A) Primary clarification

B) Grit removal

C) Biological nutrient removal

D) Sedimentation