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Water 1234

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Dep. of community medicine , Bangladesh, Dhaka

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Water 1234

  1. 1. Water Pollution Presented By: Dr. Md. Salequr Rahman Dep. Of Community Medicine
  2. 2. What is water? Water is made of tiny molecules of hydrogen and oxygen. Each one is so small that you can’t see it even with the most powerful microscope. Pure water has no colour , no taste and doesn’t smell of anything. Water exists in three forms on the Earth: > solid (ice, hail, snow or frost) > liquid (in lakes, oceans, rain, dew, fog or mist) > gas (steam or water vapour - "invisible" water in the air).
  3. 3. What Is Water Pollution?  Any chemical, physical or biological change in the quality of water that has a harmful effect on any living thing that drinks or uses or lives (in) it.  When humans drink polluted water it often has serious effects on their health.
  4. 4. Types of Water Pollution • • • • • • • Surface Water Pollution Ground Water Microbiological Chemical Oxygen Depleting Nutrients Suspended Matter
  5. 5. Causes     MARINE DUMPING OIL POLLUTION GLOBAL WARMING RADIOACTIVE WASTE
  6. 6. Wa y s T o Pr e v e nt  Wisely observe which nutrients are required on the yard before fertilizers are applied.  Wisely choose alternatives methods.  Do not throw rubbish in the sewage or any water passage.  Follow the law.  Do not litter.  Act smart.
  7. 7. Water Treatment
  8. 8. Conserve Water  Run your clothes washer and dishwasher only when they are full. You can save up to 1,000 gallons a month.  Monitor your water bill for unusually high use. Your bill and water meter are tools that can help you discover leaks.  Shorten your shower by a minute or two and you'll save up to 150 gallons per month.  Use sprinklers for large areas of grass. Water small patches by hand to avoid waste.  Collect water from your roof to water your garden.
  9. 9. Why should we save water? Of all the water in the world, only 3% is fresh. Less than one third of 1% of this fresh water is available for human use. The rest is frozen in glaciers or polar ice caps, or is deep within the earth, beyond our reach. To put it another way, if 100 liters represents the world's water, about half a tablespoon of it is fresh water available for our use.
  10. 10. Water Cycle The water evaporates from the rivers, seas, lakes and forms clouds. When the temperature decreases the water vapor becomes liquid and rain occurs. Water returns to the surface.
  11. 11. The Water In Our Lives Water is one of the most important nutrients. Our body is made up of at least 60% of water.

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