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Eutrophication Jignasha Bhutka 6 th Semester College R.E. & E.E. Sardarkrushinagar Dantiwada Agricultural University

What is Eutrophication?:

What is Eutrophication? Excessive nutrients in a lake or other body of water, usually caused by runoff of nutrients (animal waste, fertilizers, sewage) from the land, which causes a dense growth of plant life; the decomposition of the plants depletes the supply of oxygen, leading to the death of animal life Depletion of oxygen in a nutrient-rich body of water by growth of too much plant life, leading to death of animal life

Eutrophication process:

Eutrophication process Oligotrophic lake with a low level of nutrients.

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Artificial input of nutrients from run-off and discharge of effluent.

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Eutrophic lake with a high level of nutrients. Phosphorus is usually the bio-limiting element in freshwater lakes.

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Rapid growth of algae and other biomass resulting in a decrease in the concentration of dissolved oxygen.

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Turbidity (cloudiness) of water increases as does rate of sedimentation.

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Increased growth of rooted plants such as reeds.

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Algal blooms during the Summer months. Note that dissolved oxygen levels are at their lowest at night when plants respire rather than photosynthesis.

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Development of anoxic conditions and release of noxious gases such as hydrogen sulphide , thioalcohols and ammonia.


Effects The major impacts of eutrophication include changes in the structure and functioning of marine ecosystems and reduction of biodiversity. Bad taste and odor : some of the algal species that "bloom" produce toxins, water taste and odor deteriorates Oxygen depletion: penetration of light into the water is diminished. This occurs because the algae forms mats as a result of being produced faster than they are consumed. Diminished light penetration decreases the productivity of plants living in the deeper waters and hence their production of oxygen. DBP precursors : As the water becomes depleted in oxygen, the abundant algae and fish die and decompose, further oxygen is consumed by this process Under anoxic conditions iron, manganese, ammonia and phosphorous are released into the water column, anaerobic bacteria flourish, producing hydrogen sulfide

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