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Environmental Impact of Aeration

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  Environmental Impact of Aeration

Homogeneous Environment

 

   Total dissolved gas concentrations in water should not exceed 110 percent.  Concentrations above this level can be harmful to aquatic life.  Fish in water containing excessive dissolved gasses may suffer from “gas bubble disease”; however, this is a very rare occurrence.  The bubbles or embolism block the flow of blood through blood vessels causing death. External bubbles (emphysema) can also occur and be seen on fins, on the skin, and in another tissue.  Marine invertebrates are also affected by gas bubble disease but at levels higher than those lethal to fish.


  Fine Bubble Aerator

   Fine bubble aeration is an efficient way to transfer oxygen into water.  Attached to a fine bubble diffuser are some emitters (diffusers) which produce fine air bubbles. The EPA (Environmental Protection Agency) defines a fine air bubble as anything smaller than 2mm in diameter.
Fine bubble diffused aeration can maximize the surface area of the bubbles and thus transfer more oxygen into the water per bubble.  Additionally, smaller bubbles take more time to reach the surface so not only is the surface area maximized, but so are the number of seconds each bubble spends in the water, allowing it more time to transfer oxygen to the water.  As a general rule, smaller bubbles and a deeper release point will generate a greater oxygen transfer rate.

Stationary Aeration Turbine

Stationary Aeration Turbine

 

   However, almost all of the oxygen dissolved in the water from an air bubble occurs when the bubble is being formed. Only a negligible amount occurs during the bubbles’ transit to the surface of the water. This is why an aeration process that produces many smaller bubbles is better than one that makes fewer larger ones. The breaking up of larger bubbles into smaller ones also repeats this formation and transfer process.

Sample of the OxyTurbine Brochure 2015


  What is “Oxygen Transfer”?

   Oxygen transfer is a term that means different things to different people.   Some people use the term for dissolved oxygen. Some use the term for oxygen input. Because of these misunderstandings, this term is not discussed on this website.  Anyone interested in knowing the O² input can calculate it from the air capacity.
Let us take this definition as follows: oxygen transfer = saturation (dissolved oxygen).

Oxygen transfer depends not only on the type of aerator but also from:
– The depth of the rotating turbine.
– The size of air bubbles.
– The temperature of the water.
– The shape of the pool or lagoon.
– The viscosity and density of the water to be aerated.
– The pressure of oxygen in the water and atmospheric air (21% O²). The larger the difference in partial pressure, the faster the oxygen transfer (saturation).

NOTE:
If someone asks what the O² transfer is (dissolved oxygen), the correct answer is that it depends not only on the turbine, but it also depends on other factors as above described.
Oxygen transfer or dissolved oxygen can be from 0% to about 70%. The density of air at sea level and 20°C has a density of approximately 1.286 kg/m³ or 1.286 g/liter (Boyle and Charles law).  By volume, dry air contains (1,28 multiplier) 78.09% nitrogen and (4,773 multiplier) 20.95% oxygen.  So, 0.286 g of O² is in one liter of air, or 0.286 kg of O² are in one cubic meter of air at standard pressure and temperature.   The specific weight of one liter of oxygen is 1,429 g and of nitrogen, it is 1,251 g in standard conditions according to the ideal gas law.

Turbina za ozračevanje stoječih vod (SLO)


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