1. WATER Treatment & Quality
Mrs. McAven
8th Grade Science
Riverwood Middle School

2. Reminder: Water Quality Vocabulary Create a Quizlet SET
Stewardship -
Remote Sensing
Ground truthing
Environmental Protection Agency
Water Treatment Plant
Raw Water Intake
Filtering/Screening
Coagulation
Flocculation
Sedimentation
Settling Basin
Second Filtration
Disinfecting
Storage
Distribution
Pathogens -
Toxins -
Nitrates -
Phosphates -
pH -
Turbidity -
Bioindicators -
organic -
Phytoplankton -
Algae -
Photosynthesis -
Respiration -
Carbonic acid -
Macroinvertebrates -
Sustainability -
Water quality –
Potable (potability) -
Safe Water
Pollution
Pesticides
Human waste
Industrial waste
Chemical waste
Stored chemical waste
Smoke and exhaust
Acid rain
Run-off
(Industrial, agricultural, road, residential)
Point source (stressor) -
Non-point source (stressor) -

3. REMINDER: Water Usage Collection Chart

4. Point source pollution
&
Non-point source pollution
REVIEW

5. What is water pollution?
Read the full article here to get an understanding for water pollution:

7. Video…Let’s Think Flush To Finish
1. Where does the water go when it is first flushed down the toilet?
2. What is the use of gravity called in the water treatment process?
3. Why are the grit basins sloped towards the center?
4. What is the good bacteria referred to?
5. What two chemicals must be removed and monitored from the water?
6. What does coagulate mean?
7. What does effluent mean?

8. Why we need to clean our water
Let’s Start with some videos as a class.
Waste Water: Where Does it Go?
Purifying Human Waste
Water Recycling Plan

9. How We clean our water:
Now you’re on your own.
Follow through the reading and activities in this powerpoint and fill in your notes.

10. Water Treatment Process

11. Step 1: Raw Water Intake and Screens
Intake structure - delivers water to the water treatment plant
Lake or Reservoir
Stream or River
Groundwater
Screens – prevent trash, logs, or fish from entering the treatment plant

12. Step 2: Coagulation and Flocculation
In coagulation, coagulants like lime and alum are added to the water, which causes particulates to clump together.
Next, the water is shaken into larger clumps, called flocs.

13. Coagulation and Flocculation

14. Step 3: Sedimentation
The sedimentation process requires that the water stand for 24 hours, which allows the clumps to settle to the bottom.

15. Settling Basin

16. Step 4: Second Filtration
The water is then filtered, disinfected (usually with chlorine) and aerated.
Aeration helps to remove certain contaminants like radon.

17. 5: Disinfection
Disinfection – process designed to kill or deactivate most microorganisms in water, including disease causing bacteria
Types of disinfection:
Physical
Ultraviolet (UV) rays
Heat
Chemical
Chlorine
Ozone
Fecal Coliforms
Giardia lamblia

18. 6: Storage and Distribution
Storage – keeping water for later use
Elevated tanks
Ground storage tanks
Distribution system – network of pipes and pump stations that transports finished water from the treatment plant to the user

19. Now Let’s draw the process
Using a combination of the diagrams in the powerpoint and in your book, draw and label the drinking water treatment process.
The diagrams can be found on pages 106 – 107 and 110 – 111 in your book.

21. Review Time
Step 1: Watch - Fit to Drink Step 2: Complete Thirsten’s Questions - Step 3: Complete Thirsten’s Matching -
What can you do? Fun links:

22. EXTRAS http://www.wonderville.ca/asset/water-treatment