1. 11.3 Notes
Water Pollution

2. Daily planet run

3. Water Pollution
“introduction of chemical, physical, biological agents into water that degrade the water quality and adversely affect the organisms that depend on the water.”

4. Two types of Water Pollution
Point Source “pollution discharged from a single source.”
Non-Point Source
“pollution that comes from many different sources and is often difficult to identify”

5. Point Source Pollution
Look at Table 3 on page 304
What are 3 sources of POINT SOURCE POLLUTION?
- often traced to ONE source
- Enforcing clean up can still be difficult!

6. Non-Point Source Pollution
Runoff can carry pollutants into a stream Look at Table 4 on page 305 List several sources of Non-Point Source pollution - Extremely difficult to regulate and control. - 96% of water pollution comes from non-point source pollution

7. Principal Water Pollutants
Look at Table 5 on page 306 Pathogens Organic matter Organic Chemicals Inorganic Chemicals Heavy Metals Physical Agents

8. Waste Water “Water that contains waste from homes or industry”
Treated so it can be released to a river or lake
Sewage sludge: solid material that remains after treatment. Considered Hazardous Waste. Often incinerated and ash is buried.
New uses: Fertilizer?
bricks for buildings?

9. Pop quiz! NOT Close your book
Now try putting the slips of paper in the right order!

10. Steps: Filtration - wastewater
First Settling Tank – smaller particles sink to the bottom called Sewage Sludge.
Aeration Tank – mixed with oxygen and bacteria. Bacteria will use oxygen to feed on wastes.
Second Settling Tank – bacteria grown in aeration tanks removed (as sludge)
Chlorination –chlorine added to disinfect water before its released to lakes, rivers, oceans, etc.

11. Waste Water Video

12. Artificial Eutrophiciation

13. Dead zones

14. Gulf of mexico dead zone

15. Thermal Pollution Due to increase in temperature of the water
Can occur when power plants and other industries use water in cooling systems and then discharge the warm water into a lake or river.
As temperature of water increase, dissolved oxygen decreases. This creates suffocation of fish.
This oxygen deprived river will flow into over larger bodies of water which will change entire ecosystems.

16. Groundwater Pollution
Usually from percolated polluted surface water
Sources:
pesticides, herbicides, chemical fertilizers, and petroleum
Major Source: is millions of underground storage tanks that may be leaking.

17. Cleaning up Groundwater Pollution
GW is one of the most challenging problems
If cleaned, it would still remain polluted for generations
If aquifers get polluted, an attempt to clean them is hard since pollution clings to rock and sand – which will continue to pollute clean water.

18. Now complete the ws

19. Ocean Pollution
Ships can legally dump wastewater and garbage overboard in some parts of the ocean.
85% of ocean pollutants contain oil, toxic waste, medical waste – which comes from on land.
Affects sensitive coastal ecosystems the most

20. Solution? Floating trash cans?

21. Storm water Runoff
Water that runs off the land due to precipitation. It is not able to infiltrate the ground.

22. Solution? Thirsty Concrete?

23. Great Garbage Patch https://www.youtube.com/watch?v=WtewmJ78hzw

24. Oil Spills Accidental Oil Spills 5%
Most oil comes from cities/towns – millions galls of oil from nonpoint sources

25. Effects on the ecosystems and organisms

26. Water Systems and Ecosystems
Some ecosystems limit the amount of fish that people can eat

27. Cleaning up Water Pollution
Clean Water Act 1972 To “restore and maintain the chemical, physical, and biological integrity of the nation’s waters.”