…..EUTROPHICATION

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..EUTROPHICATION
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When lakes, streams and estuaries are
over fertilized, excessive production of
aquatic organic matter can become a water
quality problem and as a result the
eutrophication process can be enhanced!
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Eutrophication is a natural process!

• However, humans in their everyday activities can
  exacerbate the process
• Point sources (can locate the cause)
• Sewage treatment plant discharges
• Storm sewer discharges
• Industrial discharges
• Non-point sources (cant locate the cause, its
  everywhere)
• Atmospheric deposition
• Agricultural runoff (fertilizer, soil erosion)
• Septic systems

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BEFORE EUTROPHICATION
AFTER EUTROPHICATION
Eutrophication a process by which a body
of water progresses from its origin to
its extinction. This process happens in stages.
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Eutrophication process in 6 stages

ADDITION OF NITRATES
GROWTH OF PLANTS
DEATH OF PLANTS
GROWTH OF BACTERIA
LACK OF OXYGEN
SUFFOCATION
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The process of Eutrophication
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The process of Eutrophication cont.
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Biochemical Oxygen Demand (BOD). This measures
the rate of oxygen consumption by a sample of
water, and therefore gives a good indication of
eutrophication. A high BOD means lots of organic
material and aerobic microbes, i.e.
eutrophication
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Eutrophication process in 6 stages

ADDITION OF NITRATES
GROWTH OF PLANTS
DEATH OF PLANTS
GROWTH OF BACTERIA
LACK OF OXYGEN
SUFFOCATION
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Before increases in nutrients
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Acceleration of eutrophication
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Results of eutrophication
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Photo 1 Algal bloom in a lake.
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Photo 23 Lake Biwa, the largest lake in Japan
during summer time showing overgrowth of aquatic
plants.
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Photo 4 Fish mortality due to lack of oxygen in
an Indonesian lake.
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Put in order the stages of Eutrophication!
LACK OF OXYGEN
DEATH OF PLANTS
GROWTH OF BACTERIA
SUFFOCATION
GROWTH OF PLANTS
ADDITION OF NITRATES