1. Chapter 11-3 Water Pollution
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2. Water Pollution
Introduction of chemical, physical or biological agents that adversely affect the organisms that depend upon that water

3. Point-source versus Nonpoint-source pollution
Point-source can be traced to a source
Nonpoint –source comes from many different sources that are often hard to identify

7. Pathogens
Parasites, bacteria and viruses that cause illness in living things
Many spend part of their life cycle in water
Pathogens carried by water cause more human deaths than any other environmental problem

8. Cholera Acute diarrhea Caused by bacteria
Infected food water, shellfish
Heat kills cholera bacteria

9. Dysentery Several bacteria and protozoa responsible
Vomiting, severe diarrhea
Cause water contamination
Heat kills most of these

10. Typhoid Fever Salmonella Thyphi Only people carry the bacteria
Shed in feces
Vaccination available
Boil it , cook it, peel it or forget it

11. Schistosomiasis Caused by microscopic worms
Enters through the skin of people who walk in infected water
Attacks liver, urinary bladder, and intestines

12. Schistosomiasis Africa, Middle East, Egypt 100 million people affected
1 million deaths annually
Aswan Dam

14. WAPI 158 degrees F

15. Malaria Protozoan Transmitted by mosquito
The mosquitoes breed in standing water
800 million affected
1 million deaths annually

17. Organic Matter
Animal and plant remains, feces etc.

18. Organic Chemicals
Pesticides, fertilizer, gasoline, oil etc..

19. Runoff from farmlands
Organic pesticides, herbicides and fertilizers

20. Inorganic chemicals
Acids, bases, salts, etc..

21. Heavy Metals
Dangerous heavy metals include: Mercury, lead, cadmium, nickel, chromium and Slipknot.

22. Physical Agents
Heat and suspended solids

23. Wastewater
Contains waste from homes or industry

24. Treatment
Primary – filtration and settling. Gets the big stuff out

25. Secondary
Aeration
Second settling tank
Chlorination to kill pathogens

26. Artificial eutrophication
Caused by fertilizer run-off or other organic wastes

27. Thermal Pollution Heat can be a type of water pollution Power Plants
Reservoirs

29. Groundwater Pollution
Any polluted surface water can become polluted groundwater
Very hard to clean up

30. Ocean Pollution
Oil spills – Exxon Valdez 1989
Plastics

32. Cleaning up water pollution
Clean Water Act of 1972
Safe Drinking water act of 1996