2 hypoxia n nutrient loading
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2 hypoxia n nutrient loading

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2 hypoxia n nutrient loading Presentation Transcript

  • 1. 2. Hypoxia & Nutrient Loading
  • 2. Nutrients are usually limited
    • This limits the amount of plant growth
    • In oceans, the limiting nutrient is usually Nitrogen (N)
    • Where does N come from?
    • Is it limiting in estuaries? Why?
  • 3. Eutrophication
    • Too much of a good thing!
    • Over fertilized plants (mostly plankton) in water cause an increase “aging” of the estuary
    • How?
    • Excess Nutrients=
    • Increased phytoplankton growth  death  sink  decomposition
  • 4. Problem
    • During decomposition, dissolved Oxygen is used up during the death that comes after eutrophication, there’s way too much O 2 leaving the system-what happens when oxygen is lacking?
  • 5. Result
    • Extremely low O 2 dissolved in the water.
    • What is this known as. . . . ?
  • 6. HYPOXIA!!!!
  • 7. When is hypoxia a problem?
    • March & August. . . Why?
    • During these months, more than usual, the thermocline prevents mixing of warm, less dense surface water with cooler, denser bottom water
    • The result. . . . Not enough O 2
  • 8. Solutions to Hypoxia
    • Improve STP’s (each one treats > 40 million gallons/day!)
    • Treatments:
    • 1 º – filtering & settling to remove solids
    • 2 º – biologically remove organic nutrients,
    • required by law, grow bacteria to help decompose organics
    • 3 º - a dvanced; chemically removes inorganic nutrients, very costly
  • 9.  
  • 10. Solutions to Hypoxia cont.
    • 2) Reduce runoff
    • To reduce chemicals getting into wetlands or out to estuaries, some companies put down
    • -Sheets/tarps
    • -Haybales
    • -Terracing
  • 11.  
  • 12. Solutions to Hypoxia cont.
    • 3) Reduce fertilizers on lawns/crops
      • Think about what times of year fertilizers are usually applied!
  • 13. Solutions to Hypoxia cont.
    • 4) Reduce phosphates & other nutrients in products we use (i.e. soaps, which we did)
    Mmmm. . . so fun to swim in this!