Environmental Health Unit Water Pollution Lesson by zie20290

VIEWS: 15 PAGES: 11

									                   Objectives:
•TSWBAT identify types, causes, dangers,
preventing, and treating water pollution.
•TSWBAT create solutions and actions to reduce
water pollution in our building and at home.
   Water Pollution
 Water covers over 70% of the Earth's surface
and is a very important resource for people and
   the environment. Water pollution affects
drinking water, rivers, lakes and oceans all over
 the world. This consequently harms human
     health and the natural environment.

  Today you will find out more about water
 pollution and what you can do to prevent it.
Types of Pollution
 Can come from a number of
  different sources:
    Single source (oil spill) = point-
     source pollution
    Many sources = nonpoint-source
     pollution
 Most affect the immediate area
  surrounding the source.
 May affect the environment
  hundreds of miles away from the
  source (nuclear waste) =
  transboundary pollution.
Causes of Pollution
 Sewage & wastewater:
    Domestic households, industrial &
      agricultural practices produce wastewater that
      can cause pollution of many lakes & rivers.
 Marine dumping (in parenthesis is how long is
  takes for that item to degrade):
    Cardboard (2 wks.)
    Newspaper (6 wks.)
    Photodegradable packaging (6 wks.)
    Foam (50 yrs.)
    Styrofoam (80 yrs.)
    Aluminum (200 yrs.)
    Plastic packaging (400 yrs.)Glass (???)
Causes of Pollution
 Atmospheric deposition:
    Acid rain
 Radioactive waste:
    Nuclear waste is produced from industrial,
     medical & scientific processes that use
     radioactive material.
    Nuclear waste can have detrimental effects
     on marine habitats.
 Underground storage leaks:
    Over time the steel corrodes and causes
     leakages, affecting surrounding soil and
     groundwater.
Causes of Pollution
 Global warming:                            Industrial waste –
     An increase in water temperature          Asbestos, Lead, Mercury,
      can result in the death of many             Nitrates, Phosphates, Sulphur,
      aquatic organisms and disrupt               Oils, Petrochemicals
      many marine habitats
                                             Oil pollution:
 Eutrophication:
                                                Oceans are polluted by oil on a
    When the environment becomes
                                                  daily basis from oil spills,
      enriched with nutrients. This can
                                                  routine shipping, run-offs &
      be a problem in marine habitats
                                                  dumping.
      such as lakes as it can cause algal
      blooms.                                   Oil spills make up 12% of the oil
    Fertilizers are often used in                that enters the ocean. The rest
      farming, sometimes these                    comes from shipping travel,
      fertilizers run-off into nearby             drains & dumping.
      water causing an increase in
      nutrient levels.
     Great Garbage Patch
             What do you think???
http://www.youtube.com/watch?v=uLrVCI4N67M
Dangers of Pollution
 Virtually all types of
  water pollution are
  harmful to the health of
  humans and animals.
 Water pollution may not
  damage our health
  immediately but can be
  harmful after long term
  exposure.
Preventing Pollution
 Conserve water
    turn off the tap when running water is not necessary
    helps prevent water shortages & reduces amount of water needing
     treatment
 Be careful about what you throw down your sink or toilet.
    Don't throw paints, oils or other forms of litter down the drain.
 Use environmentally household products
 Don’t overuse pesticides and fertilizers
    This will prevent runoffs of the material into nearby water sources.
 Plants in your garden prevent fertilizer, pesticides &
  contaminated water from running off into nearby water sources.
 Don't throw litter into rivers, lakes or oceans.
    Help clean up any litter you see on beaches or in rivers and lakes,
     make sure it is safe to collect the litter and put it in a nearby bin.
Treating Pollution
 Industrial:
    Sewage goes through a number of chambers and chemical processes to
     reduce the amount and toxicity of the waste.
 Septic Tanks:
    Septic tanks treat sewage at the place where it is located, rather than
     transporting the waste through a treatment plant or sewage system.
 Dentrification:
    Used to prevent the leaching of nitrates in soil - stops any ground water
     from being contaminated with nutrients.
 Ozone Wastewater :
    Oxidizes substances (such as iron and sulphur) so that they can be
     filtered out of the solution.
    There are no nasty odors or residues produced from the treatment.
    Ozone converts back into oxygen quickly, and leaves no trace once it
     has been used.
•Complete the worksheet for class credit.
•Hand the completed worksheet to Mrs. Panaski
by the end of class today or at the beginning of
the next class meeting.

								
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