Types of pollution


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Types of pollution

  1. 1. The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
  2. 2. Pollution of the water in rivers and lakes
  3. 3. Water Pollution is harmful to the health of humans and animals. It may not damage health immediately but can become harmful after long term exposure. Different forms of pollutants affect the health of living beings differently. They can be broadly classified under 4 categories:1) Biological agents: Virus, bacteria, protozoa, algae, fungus 2) Organic chemical agents: Oil, gasoline, pesticides 3) Inorganic Chemical agents: Salts, acids, nitrates, phosphates 4) Physical agents: Suspended solids and heat
  4. 4. Both organic and inorganic impurities are present in the soluble, insoluble and colloidal forms in water. Impurities may be classified as the following1) Suspended impurities (a) Bacteria and viruses, some of which cause various diseases (b) Algae, protozoa and fungus cause odour, turbidity, colour and clogging of pipes
  5. 5. 2) Dissolved impurities (a) Salts (i) Calcium causes alkalinity and hardness (ii) Magnesium chloride causes hardness and is corrosive in nature. (iii) Sodium causes alkalinity and has a brackish taste. (b) Metals (i) Iron oxide causes bad taste, red water, discolouration of clothes and hardness (ii) Lead causes cumulative cumulative poisoning (c) Gases (i) Oxygen corrodes metals/pipes (ii) Carbon dioxide causes acidification and is corrosive
  6. 6.   Sewage :sewage contains many chemicals , paper , plastic and other wastes people flush Down their toilets. Untreated sewage and fertilizers cause uncontrolled growth of algae and plankton over large areas of oceans which depletes oxygen from the water killing life forms leading to what is known asdead zone .
  7. 7. Industrial and chemical wastes :    Chemicals Discharged from the factories that are washed down into drains and eventually Into oceans causes tremendous harm to the environment as the chemical compounds Enter the food chain . Highly toxic chemicals such as polyclorinated biphenils(PCB) which were used to manifacture electronic circuit board have now been widely banned.however,their harmful effects on the enviorment will take many years to fade because PCBs last for a very long time in the enviornment without breaking down.
  8. 8. SURFACE RUN Surface run from agricultural fields carry with it a deadly mixture of chemicals , pesticides and fertilizers .Most pesticides are non- degradable and remain in water for a long period of time and thus enter the food chain through aquatic plants and animals . The fertilizers increase the amount of nutrients in water bodies leading to eutrophication.
  9. 9. Offshore drilling- platform accidents and oil spills resulting from oill tanker accidents have devastating effects on the environment. Nuclear fallouts, chemical wastes and dumping of radioactive wastes.
  10. 10. Prevent Water Pollution