Sec 2 NA Water Pollution


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Sec 2 NA Water Pollution

  1. 1. Water pollution
  2. 4. Sewage <ul><li>Sewage refers to solid or liquid waste produced by household or industries. </li></ul><ul><li>Sewage is treated at sewage treatment plants to remove the waste product from the water before it is released into water bodies. </li></ul>
  3. 5. Non-biodegradable <ul><li>Some of the substance in sewage such as detergent are non-biodegradable. </li></ul><ul><li>They cannot be easily broken down into harmless substance. </li></ul><ul><li>The substance remain the water and cause water pollution. </li></ul>
  4. 7. Causes of water pollution <ul><li>Improper disposal of waste </li></ul><ul><ul><li>Domestic waste </li></ul></ul><ul><ul><ul><li>If sewage is not treated before discharge into water bodies, they will get polluted. </li></ul></ul></ul><ul><ul><ul><li>Human waste </li></ul></ul></ul><ul><ul><ul><li>Detergent </li></ul></ul></ul><ul><ul><ul><li>Chemicals </li></ul></ul></ul>
  5. 11. Industrial waste <ul><li>Waste produced by industries in the manufacturing stage. </li></ul><ul><li>It is harmful as it contain large amount of toxic chemicals. </li></ul><ul><li>This waste is illegally disposed directly into rivers or seas causing heavy pollution. </li></ul>
  6. 15. Oil spills <ul><li>Oil is spill into the sea. </li></ul><ul><li>It is very difficult to clean up oil spill. </li></ul><ul><li>They spread over large areas and not easily broken down. </li></ul>
  7. 19. Consequences of water pollution <ul><li>Endangering plant and animal species </li></ul>
  8. 22. Endangering plant and animal species <ul><li>A layer of oil spreads over the water surface. </li></ul><ul><li>When the sea birds come into contact with the polluted water. </li></ul><ul><li>The oil sticks to their feathers or fur </li></ul><ul><li>This removes the air trapped by the feather or fur which functions as a layer of insulation for the animals. </li></ul><ul><li>Cause many of them to freeze to death. </li></ul>
  9. 23. Endangering plant and animal species <ul><li>The oil also clogs the birds’ feathers and prevent them from flying or floating on the water. </li></ul><ul><li>This causes many birds to drown. </li></ul>
  10. 24. Consequences of water pollution <ul><li>Negative impact of human health </li></ul>
  11. 25. Negative impact of human health <ul><li>Poisons in industrial waste can accumulate in the bodies of fishes and shellfish. </li></ul><ul><li>These poisons may be passed on to human when human consume the contaminated animals. </li></ul><ul><li>People might suffer from cholera and typhoid when they drink water that is contaminated. </li></ul>
  12. 30. <ul><li>Do you think the water is drinkable? </li></ul><ul><li>Do you think the water is fit for consumption? </li></ul>
  13. 31. Consequences of water pollution <ul><li>Economic loss </li></ul>
  14. 32. Economic loss <ul><li>Water pollution affect the economy. </li></ul><ul><li>Oil spills threaten fishermen’s livelihood as well as the fishing industry. </li></ul><ul><li>When the spilled oil reaches a tourist resort along a coast, it dirties the beach and make it unattractive to tourists. </li></ul>
  15. 40. Oil spill cleaning up <ul><li>Requires huge effort to clean up </li></ul><ul><li>It is very costly. </li></ul><ul><li>It can spread over a larger area </li></ul><ul><li>It is not easily broken down. </li></ul><ul><ul><li>Example Exxon Valdez </li></ul></ul><ul><ul><li>10 000 workers </li></ul></ul><ul><ul><li>US$2.1 billion </li></ul></ul><ul><ul><li>Four years to finish cleaning up </li></ul></ul>