Eutrophication

3,050 views

Published on

Eutrophication

  1. 1. BY Muhammad Nadeem Ashraf Soil & Environmental SciencesFaculty of Agriculture, Rawalakot.
  2. 2.  (Greek: eutrophia—healthy, adequate nutrition, development; German: Eutrophie) is the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic system.
  3. 3.  Natural runoff of nutrients from soil and weathering of rocks inorganic fertilizers Manures from farms Erosion Discharge of detergents Discharge of partially treated or untreated sewage Domestic and industrial waste Animal wastes and sediments entering into water
  4. 4. Two types of Eutrophication Natural Eutrophication Cultural Eutrophication
  5. 5.  The process of water bodies aging characterized by nutrient enrichment due to natural reasons is natural eutrophication. During this process the micro plants like algae, which initially grows in lakes & streams add further nutrients in lakes in their dying phase. This helps in growth of micro plant like water hyacinth which further increase nutrient in death phase.
  6. 6.  In this way oligotrophic lake is converted into eutrophic lake. It permits the production of phytoplankton,algal blooms & aquatic vegetation. In initial phase there is no deficiency of oxygen but in lateral phase dissolved oxygen is depleted causing death of aquatic animals
  7. 7.  Its the process that speeds up natural eutrophication because of human activities.it is caused by increased nutrients input into water bodies. These results in excessive growth of plant known as algal bloom. this reduced amount of dissolved oxygen in water and cause animal and plant death.
  8. 8.  Species diversity decreased Turbidity increases Anoxic conditions may develop Depletion in oxygen Loss of desirable fish species Decrease in perceived aesthetic value of water bodies
  9. 9. *Waste water must be treated before its discharged into water*algal bloom should be removed upon death*physiochemical methods can be adopted to remove dissolved nutrients e.g. phosphorus can be removed by precipitation*by direct killing of aquatic plant e.g. cuso4

×