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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 such as lakes as it can cause algal dumping. 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. Great Idea! http://www.charitywater.org /willandjada/ •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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