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SAI International School
                                               Subject - Chemistry
                                                     Class - VIII
                                      Topic – Pollution of Air and water
                    Sub-Topic-Pollution of Air and WaterPurification of water and
                                         prevention of water pollution

                                                  LESSON NOTES


          Controlling water pollution
          The various ways of controlling water pollution are as follows.

          1.  Sewage should be treated properly at sewage treatment plants to make it harmless
             before discharging it into a nearby river.
          2.  Farmers should use the correct amount of fertilisers and pesticides in the fields so that
             excessive amounts of these harmful agricultural chemicals are not washed into the
             water bodies.
          3.  All the industries should treat the toxic wastes produced by them to make them
             harmless before discharging it into a nearby river.
          4.  Water pollution prohibition laws that exist for the industries producing toxic chemical
             wastes should be implemented strictly by the concerned authorities.
          5.  Garbage should not be thrown into the water bodies. They can be disposed of
             properly.
          6.  Dead bodies not to be thrown ion water bodies, they should be cremated or buried in
             the soil.
          7.  People should be made aware of the harmful effects of water pollution so that they
             may co-operate and may help in preventing it.

          Conservation of water

          We know that a very less amount of available water is fit for drinking. And this drinking
          water is available in the form of rivers, ponds, lakes, and rain. But these water bodies are
          polluted by various human activities. Before the drinking water is supplied to us, it is
          treated in a water treatment plant. The entire process requires a lot of hardwork and it
          costs a lot of money. We should conserve water by using it carefully, economically, and
          avoiding its wastage. The various ways to conserve water are

          1.  Turn off the tap immediately after use.
          2.  Get the leaking taps repair immediately. A leaking tap that drips even once every
             second waste a few thousand litres of water every year.
          3.  Brush your teeth by filling water in a mug. Leaving the tap running while brushing or
             shaving may waste several litres of water.
          4.  Take bath by filling water in a bucket and not directly under the running tap.
          5.  Wash the utensils by filling water in a basin and not under the running tap.
          6.  Use water from washing rice, pulses, vegetables, and fruits for watering the plants at
             home.
          7.  Do not use the full flush from the cistern in the toilet when a half flush is sufficient.




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