student's presentation about water pollution

1. Water Pollution

2. The loss of any beneficial use of water

3. The discarge of polluting material upsets the balance between the gases and the salts dissolved in water But these salts are the very factors which make the water suitable for beneficial uses.

4. Producing the growth of algae suffocation of aquatic animals

5. Artificial fertilizers which are washed from the soil may be accumulated in rivers

6. The oil released by tankers contaminates beaches and causes the death of marine organisms

7. It upsets the balance of the ecosystem

8. 1. Screening : removes Fishes, sticks,cans.. 2. Chlorination :Adds chlorine to kill bacteria 3. Addition of alum : it traps the tiny particles suspended in the water 4. Sedimentation : the particles trapped by aluminium settle to the bottom of the tank 5. Filtration :Removes any remaining suspended materials Waterworks