Introduction

Name four household sources of wastewater other than toilets. [4]

What % of the wastewater mixture entering this treatment plant is only water? [1]

Why is the city’s wastewater treatment plant located at this site? [2]

1.Screening

a. What is removed from the wastewater by the grit chamber? Why? [2]

b. What is removed from the wastewater by the step screen? Why? [2]

2.Phosphorus Removal

a. The biotic phosphorus removal system that takes place in these tanks uses __________________________

that are primarily __________________ to remove phosphorus compounds from the water. [2]

b. What are 3 effects the phosphorus would have on the water quality of the Rock River if it was not removed? [3]

3. Aeration Tanks

a. The aeration tanks use microorganisms that are primarily ____________________________ to remove _____________________ from the wastewater. [2]

b. What are 3 effects the ammonia would have on the water quality of the Rock River if it was not removed? [3]

c. The fact that microorganisms are used to clean up the wastewater indicates that wastewater contains pollutants that are _____________________________. [1]

4. Final Clarifiers

a. What happens in the final clarifiers? [1]

b. The microorganisms settle to the bottoms of the final clarifier because they are ____________________

than water. [1]

c. What happens to most of the microorganisms that have settled to the bottoms of the final clarifiers? [1]

d. What happens to the rest of the microorganisms? [1]

5. Thickening of Biosolids

a. What happens in this stage of treatment? [2]

b. Where do the biosolids removed by this process go? [1]

6. Storage and Disposal of the Biosolids

a. What is the total volume of biosolids that can be stored in these tanks and for approximately how long? [2]

b. What happens to the biosolids after they are removed from the storage tanks? [1]

7. Chlorination

a. What happens to the final water here? Why? [2]

b. What might happen to people swimming or water-skiing in the Rock River if this step in the treatment process was not done? [1]

8. Discharge

a. Where does the final water from this treatment plant go after all treatment is completed? [1]

b. How far does the final water travel to reach the Rock River? How does it get there? [2]

9. Lab Tour

a. List three different items that have been removed from the sewage pipes and saved for “the collection.” [3]

b. Write out the abbreviations and the full names for five of the water quality tests that must be performed in this laboratory. [10]

SEPTIC TANK SYSTEMS

1.What are three similarities between the wastewater treatment plant and a septic tank system? [3]

a.

b.

c.

2. What are three differences between the wastewater treatment plant and a septic tank system? [6]

a.

b.

c.

3

Aeration

Tanks

5

Thickening of Biosolids

6

Storage and Disposal

of Biosolids

4

Final

Clarifiers

2

Phosphorus

Removal

1

Screening

Raw waste-water arrives at this site

8

Discharge of final water into a river

7

Chlorination of final water

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