1. Chapter 7 Section 2 Water Quality LT: I will describe the methods humans use to monitor water quality.

2. Agree Disagree 1._______ ________ 2._______ ________ 3._______ ________ 5._______ ________ 4._______ ________ Acid rain will have a lower pH number than pure water. Chlorine is a chemical added to water to kill bacteria. Water that goes down a storm drain on a road is cleaned before it goes back into our water supply. Some water can be “harder” than other water. E. Coli is a bacteria commonly found in river water.

3. I. Water Quality Standards: A. Acidity – measured using the pH scale, healthy water has a pH of 7.0 B. Hardness – concentration (amount) of dissolved calcium and magnesium minerals

6. C. Coliform Count – concentration of disease causing organisms (E. coli bacteria)

7. II. Treating Drinking Water A.Filtration – passing water through screens 1. Activated Carbon – charcoal with tiny holes that trap harmful wastes B.Chlorine – chemical added to water to kill bacteria

8. http://www.youtube.com/watch?v=eIoSt0-K7wI

10. Control Center

11. Testing Water Quality Standards

12. Coagulation and Settling Basins

14. Chlorine and Fluoride water additives

15. III. Treating Wastewater A.Wastewater Treatment Plant – cleans sewage before returning it to nature B.Septic System – underground tank that cleans sewage from a single household http://www.youtube.com/watch?v=uuORuwb4cfs

16. http://www.youtube.com/watch?v=QT7FYQBbcRE

17. Agree Disagree 1._______ ________ 2._______ ________ 3._______ ________ 5._______ ________ 4._______ ________ Acid rain will have a lower pH number than pure water. Chlorine is a chemical added to water to kill bacteria. Water that goes down a storm drain on a road is cleaned before it goes back into our water supply. Some water can be harder than other water. E. Coli is a bacteria commonly found in river water.

18. http://www.youtube.com/watch?v=GV-DoisLwm0