Answer the following
questions about the Dissolved Oxygen Depletion curve.
1. Give three examples
of point-source pollution that could be coming from the pipe illustrated in the
decomposition zone, use page 284 to help you answer.
2. What type of
pollutants are commonly found in from the point-sources you listed?
3. What units are used
to report dissolved oxygen?
4. What happens to
dissolved oxygen in the decomposition zone? What happens to biochemical oxygen
demand in the decomposition zone?
5. How do changes in
DO and BOD in the decomposition zone affect the number species present in the
water? How do the changes affect the types of species found in the
decomposition zone?
6. What types of
species are found in the water when dissolved oxygen is 2ppm? 8ppm?
7. What happens to
biochemical oxygen demand in the septic zone? What do you think causes this
change?
8. What happens to
dissolved oxygen in the recovery zone? What is the relationship between
dissolved oxygen and biochemical oxygen demand?
9. Trout, perch, and bass are indicator species. What do you think these species tell us about the water quality in lake, stream or river?
10. Thermal pollution
is a point-source pollutant, commonly found near power plants which discharge
cooling water. Draw the following table on your paper, and fill the data from
the overhead as I demonstrate the affect of thermal pollution on dissolved
oxygen.
|
Temperature
|
Dissolved Oxygen
|
11. Graph the
change in temperature and dissolved oxygen over time. Make sure you use
different colors to indicate DO and temperature.
