3. Some of the stuff that it dissolves / suspends is good for us Others, not so good Water Pollution
4. Can you name 5 things that dissolve in water? Know of any 2 that can be called ‘pollutants’ – those dangerous to life ?
5. If we drink polluted water, we can get sick Cholera Typhoid Jaundice Cancer Organ failure
6. Figure out some pollutants + + _ _ _ _ _ _ _ Led Zeppelin Black Sabbath Deep Purple Iron Maiden _ _ _ _ _ _ _ _ _ _ + _ _ _ _ _ _ _ Sounds like + _ _ _ _ _ _ _ _ Clue: toothpaste C T S K G H
7. Figure out some pollutants + + ARSENIC Led Zeppelin Black Sabbath Deep Purple Iron Maiden HEAVY METAL + NITRATE Sounds like + FLUORIDE Clue: toothpaste C T S K G H
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9. How do we know that water is polluted? Water pollution can be confirmed only by testing it in a lab
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11. Water can get polluted naturally When water seeps into the ground, it absorbs different substances depending on the type of soil and rock that it flows through.
12. Water can get polluted naturally Some of these substances (arsenic, iron, fluoride etc) can be harmful to health Natural pollution is a non-point source of pollution
13. Arsenic Fluoride Natural pollution can introduce chemicals that collect in our bodies. Over time this can cause chronic problems and even life – threatening diseases . In groundwater In groundwater
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17. The various ways in which man pollutes water When garbage is dumped in a landfill, toxic chemicals leach into the soil and groundwater. Dumping garbage in surface water bodies
18. Over 10 million people bathe in the Ganga daily! The various ways in which man pollutes water Washing and bathing introduces phosphates and other chemicals into water
19. The various ways in which man pollutes water Agriculture is a major source of groundwater contamination. Agriculture An example of Non- Point source of pollution dissolve in irrigation water or rainwater. They contaminate surface water and groundwater with pollutants like nitrates, phosphates and non degradable synthetic organic pollutants
20. The various ways in which man pollutes water Industry Agro industries – their wastes have high concentration of dissolved organic matter Chemical Industries – If their wastes are not treated properly, the chemicals can destroy our soil and water resources. Petroleum refining – water used in the process needs to be separated from all the oil before releasing it into nature……but is that done?? An example of Point source of pollution Minamata disease Can you name any Agro Industry? sugar, food processing, pulp and paper, distilleries Name some Chemical industries
21. The various ways in which man pollutes water Industry Thermal power plants – water is needed to cool the process. The water gets hot and when it’s released into a larger water body, it upsets the ecology by modifying the delicate temperature balance. This is called ‘Thermal pollution’ An example of Point source of pollution
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24. Hangman Divide the class into 5 teams Draw as many dashes as in the name of a water pollutant or a pollution cause Team A starts. They guess a letter. The teacher puts in the letter at the correct place, if it is there in that name. Else, the letter is written down on one side. A maximum of 10 wrong guesses are allowed. The team gets as many points as letters on the side (maximum of 10). The team with the lowest number of points wins
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27. Eutrophication Anaerobic organisms then attack the organic wastes, releasing gases such as methane and hydrogen sulphide. The result is a foul smelling, waste filled body of water, quite like many of the lakes in India. These water bodies are also natural groundwater recharge system and their contamination also leads to groundwater pollution.
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29. Strange things started to happen – cats had convulsions and died, crows fell from the sky, dead fish floated.. Young children had convulsions and difficulty in walking and speaking People died Investigation showed organic mercury poisoning affecting the nervous system First discovered in 1956 Lawsuits and claims continue till today Did you know? One mercury thermometer can contaminate up to 95,000 litres of water to beyond the drinking water standard.
