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Water pollution


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Water pollution

  1. 1. By Piyush Tibarewal
  2. 2. Where do Water pollutants come from?  Point Sources – A single definable source of the pollution, e.g. a factory, a sewage plant, etc. Point-source pollution is usually monitored and regulated.  Non-point sources – No one single source, but a wide range of sources, e.g. runoff from urban areas, or farmland. Non-point sources are much more difficult to monitor and control.
  3. 3. Water pollutants  Industrial Effluents This waste water may contain acids, alkalis, salts, poisons, oils and in some cases harmful bacteria.  Mining and Agricultural Wastes Mines, especially gold and coal mines, are responsible for large quantities of acid water.  Agricultural pesticides, fertilizers and herbicides may wash into rivers and stagnant water bodies.  Sewage Disposal and Domestic Wastes Sewage as well as domestic and farm wastes were often allowed to pollute rivers and dams.
  4. 4. Classes of Water pollutants  Pathogens  Bacteria, Viruses, Protozoa,  Parasitic Worms, Colliform Bacteria Used As  Indicators Of Water Quality  Oxygen Demanding Wastes  Organics That Are  Decomposed By Bacteria And That Use A Lot Of  O2, Dissolved Oxygen (DO) Decreases, And BOD  Increases  Water Soluble Inorganic Chemicals  Acids,  Salts, Toxic Metal Compounds Like Mercury, And  Lead. Inorganic Plant Nutrients  Water Soluble  Phosphates, Nitrates => Algal Blooms, Decreased  Dissolved O2, Increased BOD,  Methemoglobinemia (="blue baby syndrome")
  5. 5. Classes of Water pollutants  Organic Chemicals  Oil, Gas, Plastics, Pesticides, Cleaning Solvents, Detergents, Etc.   Sediment & Suspended Mater  Insoluble Soil Particulates & Other Solids. Clouds The Water, Decreasing Photosynthesis, Carries Pesticides And Disrupts Aquatic Food Webs.   Radioactive Isotopes  Are Biologically Amplified To Higher Concentrations In The Food Chain. Ionizing Radiation & Birth Defects, Cancer.    Warmed Water  From Power Plants, Decreases DO And Increases Susceptibility To Diseases And Parasites And Toxic Wastes. 
  6. 6. Water borne diseases  Diseases caused by the ingestion of water contaminated with pathogenic bacteria, viruses, or parasites include:  cholera  typhoid  schistosomiasis  dysentery and other diarrheal diseases
  7. 7. Remedial measures  Locate the point sources of pollution.  Work against acid rain.  Educate your community.  Ensure sustainable sewage treatment.  Watch out for toxins.  Be careful what you throw away.  Use water efficiently.  Prevent pollution .  Think globally, act locally.
  8. 8. Thank you