The Stratification

Lack of Oxygen

Dissolved oxygen is gaseous oxygen dissolved in an aqueous solution.

For water of a lake or pond is in good condition it’s considered that it must have an amount of dissolved oxygen in the order of 5 ppm. Below these values ​​may begin to start problems.


What are these problems associated with low levels of dissolved oxygen?

  • The first problem that arises is the mortality of fish and other aquatic life in the lake.
  • In parallel, an effect of decomposition of organic waste, producing an anaerobic process and formation of hydrogen sulfide, so high levels of odors.
  • Also, in the case of deeper ponds, lack of oxygen will cause stratification. This means that there will be a deep part of the lake with very low levels of oxygen. This layer doesn´t mix with the other water because of temperature and density differences. It becomes a dead part of the lake with toxic gases production.
  • Finally there is a proliferation of algae and plants and, when they die, increase the sediment in the bottom of the lake so that its capacity will be impaired, and it`s volume reduced.
IT ARRIVES TO AN EUTROPHIC STATE

The Stratification

The presence of light is necessary for photosynthesis and thus the development of aquatic plants. Stratification usually happens in summer creating a warm surface layer rich in oxygen, and a deep layer cold, oxygen-poor, not become mixed. This results in a depletion of animal life in the bottom of the lake (lack of oxygen) and the occurrence of putrefaction phenomena.
This phenomenon usually occurs at average depths greater than 3 meters.


If the oxygen concentration falls to minimal levels of anoxia (very pronounced when nutrients are abundant) it results that much of the funding organisms die and begin to appear phenomena of putrefaction with release of malodorous gases. This may cause the removal of lake bottom and the extent of anoxia in whole lake, causing considerable problems.

In the anoxia state the concentration of carbon dioxide highly increases. This carbon dioxide is the main nutrient for algae, so they begin to massively proliferate.

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