Name ___________________

Date _______ Per ________

Chapter 18 Water: Pollution and Prevention

Indicate whether the following conditions are characteristic of Oligotrophic or Eutrophic bodies of water:

1. high dissolve oxygen 2. low light penetration

3. abundant phytoplankton 4. abundant benthic plants

5. low turbidity 6. cold water

7. high nutrient content 8. high species diversity

9. good recreational opportunities 10. low biological oxygen demand

List four major sources of sediments and nutrients that end up in streams and rivers.11-18

Sediments Nutrients

Explain how each of the following events/materials contribute to eutrophication:

19. Sedimentation:

20. Increased phytoplankton growth:

21. Decomposition of organisms:

22. Which two major problems can occur if raw untreated sewage goes into waterways?

23-28. Match the following list of wastewater treatments with A=primary, B=Secondary C=Tertiary

____ sand, grit, gravel

____ bar screen

____ aeration

____ raw sludge

____ denitrifying bacteria

____ activated sludge

29. Identify 3 main components of raw sewage:

30. What is the limitation of conventional wastewater treatment? (What doesn’t it accomplish)