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Human Wastewater: The Most Common Water Pollutant

Human Wastewater: The Most Common Water Pollutant. Lecture 41 Chapter 14-day-2. Two Broad Types of Water Pollution. Water pollution Any physical or chemical change in water that adversely affects the health of humans and other organisms Varies in magnitude by location

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Human Wastewater: The Most Common Water Pollutant

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  1. Human Wastewater: The Most Common Water Pollutant Lecture 41 Chapter 14-day-2

  2. Two Broad Types of Water Pollution • Water pollution • Any physical or chemical change in water that adversely affects the health of humans and other organisms • Varies in magnitude by location • Global Water Pollution Issue Lackof access to clean drinking water 2

  3. Human Wastewater • Sewage & gray water • Historic Challenge: to separate wastewater from drinking water

  4. THREE Consequences of Human Wastes • Increased Oxygen Demand (BOD) • Nutrient Addition (N/P) • Disease-causing Agents (pathogens)

  5. (1) Sewage & Oxygen Demand

  6. (1) Sewage & Oxygen Demand

  7. (1) Sewage & Oxygen Demand

  8. (1) Sewage & Oxygen Demand 8

  9. (2) Sewage & Nutrient Release • N/P sources • Cultural eutrophication Anthropogenic addition of N/P

  10. (2) Sewage & Nutrient Release

  11. (2) Sewage & Nutrient Release • Oligotrophic • Un-enriched, clear water that supports small populations of aquatic organisms 11

  12. (2) Sewage & Nutrient Release Cultural Eutrophication • Eutrophic- • Slow-flowing stream, lake or estuary enriched by inorganic plant and algal nutrients such as phosphorus • Often due to fertilizer or sewage runoff 12

  13. (2) Sewage & Nutrient Release The Dead Zone 13

  14. (2) Sewage & Nutrient Release 14

  15. (2) Sewage & Nutrient Release 15

  16. Global Dead Zone Map Source: Scientific American

  17. (3) Sewage & Disease-causing Organisms • Pathogens • Ex: Hepatitis, cholera, cryptosporidium

  18. (3) Sewage & Disease-causing Organisms “Indicator Species” • Monitored by testing for presence of E. coli in the water • Indicates the presence of pathogenic organisms 19

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