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OXYGENATORS

 


Surface oxygenators


Principle : This involves a classic aerator with an immersed motor covered with a glass fibre dome into which air or oxygen is injected.
 
Efficiency : This system ensures the maximum oxygen transfer, the strong aeration flow requires a division of the water to be treated by arranging many dome aerators to function in parallel.
 


Principle : The water flows by gravity or by pumping into a sealed enclosure equipped with a “cascade’ system and supplied with oxygen.

The water droplets cross the oxygen ‘ceiling’ and flow freely via the base of the equipment.
 
 
 


To contact AQUALOG


aqualog@aqualog.fr                Tel. : 0033 (0)4 94 10 26 26




 Oxygen Generators


Principle : Air coming from the compressor passes across an air dryer, and anti-dust coalescent filter and an activated carbon filter.
The air dryer removes humidity and cools the compressed air feed.
The clean, compressed air is fed into an individual system with two filters by a supply pipe.
An four-way electro-distributor drives the compressed air towards one of the two filters. In turn where the nitrogen is trapped due to a process of “selective absorption” until the filter is saturated.
At the same time, the electro-distributer tips up the feeding air into the second sieve guaranteeing, in this way, uninterrupted oxygen production.
While the second sieve starts to selectively absorb the nitrogen and produce oxygen, the first sieve depressurises and purges the nitrogen.
 
Principle : The source of oxygen is the compressed air, which is then treated with filtering material (zeoliths), so that there is a separation of the oxygen and nitrogen.
A high-pressure oxygen generator operates at 3-4 bars. To produce one m3 of oxygen requires 1.2 kWh; this type of device can produce up to 50 m3/hr of oxygen.
Oxygen cone


Above ground, micro-bubble system.

Principle : The Cone is 2/3 filled with water and covered by an oxygen atmosphere.

The water and the oxygen are introduced at the top of the cone. The water is sprayed under pressure onto the gaseous surface first saturating itself with oxygen.

The water jet then strikes the liquid surface and entrains fine gas bubbles which disperse and dissolve in the water.
 
The non-dissolved gas bubbles tend to coalesce together and come back up to the surface.
As it moves along, the speed 0f the water flow decreases towards the bottom of the cone.
Re-circulation of the gas through the liquid is thus assured

The duration and contact surface of the liquid-gas are considerable and allow an over-saturation of the water with oxygen to be reached.
 


 


To contact AQUALOG


aqualog@aqualog.fr                Tel. : 0033 (0)4 94 10 26 26




 Microjet Oxygenator


Principle : In a cylindrical container the microjets of water pass across the gas layer enriched with pure oxygen under pressure.
 


Jet platforms


The glass fibre mini-jet platforms function via the micro-jets passing through the pure oxygen layer under pressure.
These machines, which are easy to put into action, permit the oxygen supply to move at a rate of 1.5-15 kg per hour, treating the flows of 25 to 200 m3/h under a pressure of 1-2bars.

Principle : The jet platform gives up to twice the saturation level with a good dissolution output (around 95%).
 
To work correctly, they need a minimum difference in height of 80 cm.



They are, therefore, well adapted to a gravity flow or a recycling pump.



In general, the total flow that is to be oxygenated passes via the platform.








To contact AQUALOG


aqualog@aqualog.fr                Tel. : 0033 (0)4 94 10 26 26




 U-tubes


Principle : The U-tube uses the hydrostatic pressure of a bore-hole to increase the transfer and a descending current to stabilise, as much as possible, the bubbles formed by the emulsifier.
Classic U-tubes are capable of obtaining very significant saturation with a 100 % dissolution output.
The difference in height necessary for their functioning depends on the oxygen increase desired and the depth of the tube.

Above the ascending tube is a sealed container, which recuperates the unabsorbed oxygen, and recycles it (this is what allows the dissolution to approach 100 %).
 
A variation of these classic tubes consists of a tube with a much greater diameter which allows the dissolution of all the oxygen injected in just one pass.
The advantage is therefore in the economics of construction but the inconvenience can be the costly drilling.

Technical Characteristics:
Flow: 200-2400 m3/hr
Able to super-saturate up to 26 mg/litre.
 


Casing-enclosed oxygenator


Turboxygene is an innovative machine for oxygen enrichment of the water for fish rearing.
It features a paddled drum which rotates inside a chamber, protected by a watertight casing.
The drum, due to the specially designed paddles agitates the water and in this way brings a closer contact with the enriching oxygen supplied under the top of the casing.
The equipment is made in AISI3O4 stainless steel and reinforced glass fibre.
Compared with the other stirrers, this equipment has the following advantages:

- energy saving, due to smaller power requirements,
- greater concentration of oxygen in the water gives healthier fish, as a consequence,
- higher yield of the breeding ponds, due to the possiblity of increasing the density of fish population in the same volume of water,
- the noise pollution is almost zero,
- less cooling of the water in the winter season.



Technical specifications:

Motor: 1.1 kW (1.5PS) 50Hz, 220/380V, 1P55, for tropical operation
Water circulation : 260 m3/h
Oxygen addition : max 4000 g/02/h
Dimensions (LXWXH) : mm 1650 x 2760 x 1030
Weight : 156 kg
Operation environment: Fresh or salt water
Delivery : Factory assembled or in assembly kit.




To contact AQUALOG


aqualog@aqualog.fr                Tel. : 0033 (0)4 94 10 26 26




 





RETOUR


© 2008 - 2017 www.aquaculture-engineering.com
Aqualog
Bouée Borha
Corniche du Bois Sacré
Marépolis Est
83500 La Seyne sur Mer
Tél. : 04 94 10 26 26
Fax : 04 94 10 26 30

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