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Sizing and oxygen generator for aquaculture

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Oxygen generators produce 90 to 95% oxygen enriched gas, the remaining 5% to 10% will be nitrogen and argon.  Because the gas is not 100% pure,  oxygen generators should not be used with high pressure contactors  since the equipment will also dissolve the nitrogen into solution. The best approach is to use our ceramic oxygen diffusers to dissolve the oxygen into the water.

The Dryden Aqua DAD range of oxygen diffusers are near 100% efficient at dissolving oxygen into water.  By the time the bubbles from the diffuser reach the surface in most tanks,  the gas content of the bubble will be in equilibrium with the partial pressure of the gases in solution.  At 100% oxygen saturation,  this means that the gas bubble will contain the same fraction of oxygen as air, that is 22%. Once the efficiency of the  diffuser is taken into account,  and the efficiency of the oxygen generator is considered,  the amount of oxygen dissolved into the water will be in the region of 60% of  the figures detailed in the table above.   The table below gives the corrected data for the amount of oxygen that will actually enter solution.

Oxygen generator code approx. litres per hour of oxygen approx. (max) weight per hour of oxygen that will dissolve into the water
6.7.201 300 250
6.7.202 660 560
6.7.203 960 820
6.7.204 1320 1131
6.7.21 540 462
6.7.22 1200 1028
6.7.23 2100 1800
6.7.24 4200 3600
6.7.25 6600 5656
6.7.26 11400 9771

The amount of oxygen required by fish is a variable depending on the species, size, water temperature, water chemistry, and degree of activity of the fish.  However as a guide; the oxygen requirement of fish at rest  will be in the region of 200g/hr,   while actively feeding fish will have a requirement of 400 to 500 g/hr for every metric tonnes. If you want to size the system to provide a supplement of oxygen, you can size the unit on 200g/hr per tonne of fish.  If you require total support of the fish the oxygen generator is sized at 500 g/hr per tonne of fish.

Please note that the above should be used only as a guide for sizing an oxygen generator and oxygen diffuser system.