1. Chapter 22 Water Pollution and Treatment

2. Biochemical Oxygen Demand The amount of oxygen required for biochemical decomposition process. 3 zones ◦A pollution zone ◦An active decomposition zone ◦A recovery zone When BOD levels are high, DO is low

3. This diagram shows the relationship between DO and BOD.

4. Waterborne Disease Outbreaks of waterborne diseaseswaterborne diseases ◦Milwaukee, WI - Cryptosporidium ◦Fecal Coliform Bacteria ◦Walkerton, ON – E. coli

5. Nutrients Eutrophication ◦The process by which a body of water develops a high concentration of nutrients Cultural Eutrophication ◦When eutrophication is accelerated by human processes that add nutrients to a body of water

9. Exxon Valdez Exxon Valdez 1989

10. BP Gulf Oil Spill Ocean Floor Video BP Coast Ad BP Spill

11. Acid Mine Drainage Water with a high concentration of sulfuric acid that drains from mines Serious water pollution problem Damages aquatic ecosystems, pollutes bodies of water and degrades water quality

12. Surface Water Pollution Water Pollutants are emitted from ◦Point Sources  Distinct and confined sources such as pipes from industrial or sites ◦Nonpoint Sources  Diffused and intermittent  Ex) runoffs from streets

13. Identify these as a local point source of pollution or non-point source of pollution EB Video

14. Groundwater Pollution Bioremediation: ◦a method of treating groundwater pollution problems that utilizes microorganisms in the ground to consume or break down pollutants Semper Fi Trailer

17. Wastewater Treatment Septic Tank Disposal Systems Waste Treatment Plants ◦Primary Treatment ◦Secondary Treatment ◦Advanced Treatment ◦Chlorine Treatment

19. Wastewater Renovation and Conservation Cycle Steps: ◦1. Return of treated wastewater to crops ◦2. Renovation or natural purification by slow percolation of the wastewater into soil to eventually recharge the groundwater resource with clean water ◦3. Reuse of the treated water

22. Water Reuse Inadvertent: ◦water is withdrawn, treated and returned to the environment Indirect: ◦Ex) the wastewater renovation and conservation cycle Direct: ◦The use of treated wastewater that is piped directly from a treatment plant to the next user CA Wastewater reuse

23. Water Pollution and Environmental Law Environmental Law ◦The branch of law dealing with conservation and use of natural resources and control of pollution  Clean Water Act  Safe Drinking Water Act