1. Pollution & Clean-up

2. Think Tank What do you think is happening in this picture? Take 2 minutes to write down your answer on the top or back of your notes.

3. 2 Types of Pollution  Point Source Pollution › Pollution from one specific source  Nonpoint Source Pollution › Pollution from a widely spread source

4. Sources of Pollution  Human Waste › Heavy rain overflows sewers › Septic tanks leak › Animal waste runoff from farms

5. Sources of Pollution  Industrial Wastes › Toxic chemicals and strong acids released directly from factories › Toxic waste storage barrels leak › Exhaust from burning coal and oil resulting in acid rain › Heated water released by factories

6. Sources of Pollution  Chemical Runoff › Pesticide and fertilizer runoff from farms › Oil runoff from roads

7. Cleaning it up  Plants & Bacteria › Naturally filter out and break down waste

8. Cleaning it up  Wetlands › Filter waste and neutralize pH

9. Cleaning it up  Filtration › Passing water through screens to remove larger particles

10. Cleaning it up  Coagulation › A chemical is added to cause particles in water to form sticky globs, easier to remove

11. Cleaning it up  Chlorination › Chlorine is added to kill diseases

12. Cleaning it up  Aeration › Air is forced through purified water to reduce odors and tastes

13. Cleaning it up  Sedimentation › Gravity causes particles to settle to bottom of container