Wastewater Treatment

This webquest is about the process of wastewater treatment and can be used to better understand this topic in chemestry lessons. It is based on this video material.

You'll have to watch the video mentioned in the introduction and complete a test. There are ten questions, three possible answers for each question, only one of the answers is correct.

1.Which of those objects are separated in the earliest state of treatment?

a. Sand, debris, paper, metal and plastics.

b.Only man made objects.

c.Microorganisms.

2.What is a clarifier?

a.Chemical substance.

b.Large sedimentation tank.

c.Profession.

3. What happens to the heavy solids in the clarifier?

a.Float to the top.

b.Dissolve in the water.

c.Sink to the bottom.

4.What happens in the aeration tanks?

a.The remainng solids an organics are removed.

b.Only organics are removed.

c.The wastewater is completely cleared.

5.What breaks down sugars, starches, proteins, detergents and soaps in the aeration tanks?

a.Microorganisms.

b.Bleach.

c.Different chemicals.

6.Why is there air in the areation tanks?

a.It is used as a catalyst for chemical reaction.

b.It is needed for the microorganisms.

c.It makes the right pressure for process.

7.What happens in the secondary clarifiers?

a.The solids are being removed.

b.Microorganisms are separated and returned to the aeration tanks.

c.The wastewater is boiled.

8.What is the last stop for treated wastewater?

a.Aeration tanks

b.Sedimentation.

c.Disinfection and effluent pumping.

9.What is added to the effluent to kill disease causing bacteria?

a.Oil.

b.Pesticides.

c.Disinfectant similar to concentrated bleach.

10.What happens to the clear effluent?

a.It is discharged back into the environment.

b.It goes trough the contact tanks again.

c.It is directly used as a drinking water.

Correct answers: 1.a; 2.b; 3.c; 4.a; 5.a; 6.b; 7.b; 8.c; 9.c; 10.a.

If you answered correctly to 7-10 questions, then you have successfuly learned about the topic.

If you answered correctly to less than 6 questions I recommend you to watch the video one more time and try doing the test again.

Congratulations, you have now learned about the topic Wastewater Treatment. This will help you not only in the chemistry lessons, but also you will have better knowledge and understanding about this process.

Author: Erīna Akmene 12.a