Intelligent oxygen control in sea cages

1. A method for controlling a concentration of dissolved oxygen in a volume (V) of water (W), comprising:

submerging a device ( 1 ) for dissolving oxygen into the volume (V) of water;

sucking an incoming water stream (W) into a housing ( 100 ) of the device through a pump ( 5 ) for generating a main water stream (W′);

injecting oxygen by the device ( 1 ) at an adjustable flow rate into the main water stream (W′) in the housing ( 100 );

discharging an oxygen enriched main water stream (W″) from the device ( 1 ) out of the housing ( 100 ) into the volume (V) of water (W);

measuring a current concentration of oxygen dissolved in the main water stream (W′) with an oxygen probe ( 6 ) integrated into the housing ( 100 );

transmitting the current concentration of dissolved oxygen wirelessly to a hand-held device ( 9 ) of an operator; and

controlling the flow rate of the injected oxygen, such that the measured current concentration approaches a pre-defined reference value;

wherein the oxygen probe ( 6 ) comprises a measuring surface ( 6 a ) for measuring the current concentration of the dissolved oxygen;

wherein the measuring surface ( 6 a ) is at a tip of the oxygen probe ( 6 ); and

wherein the device ( 1 ) is configured to direct a side water stream (S′) of the main water stream (W′) from a first orifice O at a junction between an outlet pipe of said pump ( 5 ) and a means ( 200 ) for the injecting of the oxygen into the main water stream (W′), along the measuring surface ( 6 a ) for measuring the current concentration of the dissolved oxygen, and through a second orifice O′ out of the housing.

2. The method of claim 1 , further comprising adjusting the pre-defined reference value with the hand-held device ( 9 ).

3. The method of claim 1 , further comprising setting a temporal course of the pre-defined reference value with the hand-held device ( 9 ) such that the reference value can vary in a pre-defined manner during a time span over which the oxygen is injected into the volume (V) of water (W) by the device.

4. The method of claim 3 , further comprising displaying at least one of the current concentration of the dissolved oxygen, the pre-defined reference value, and the temporal course of the pre-defined reference value on a display of the hand-held device ( 9 ).

5. The method of claim 1 , further comprising logging the measured current concentrations of the dissolved oxygen a plurality of times in the hand-held device ( 9 ) for documentation.

6. The method of claim 1 , further comprising enclosing the volume (V) of the water (W) with a tarpaulin arranged below and along a periphery of a cage submerged in the water (W).

7. The method of claim 1 , further comprising partly sealing the volume (V) of the water (W) with a skirt surrounding a cage submerged in the water (W).

8. The method of claim 1 , wherein the volume (V) of water (W) comprises waste water.

9. In a method for controlling a concentration of dissolved oxygen in a volume (V) of water (W),

wherein the method includes;

submerging a device ( 1 ) for dissolving oxygen into the volume (V) of water,

sucking an incoming water stream (W) into a housing ( 100 ) of the device through a pump ( 5 ) for generating a main water stream (W′),

injecting oxygen by the device ( 1 ) at an adjustable flow rate into the main water stream (W′) in the housing ( 100 ),

discharging an oxygen enriched main water stream (W″) by from the device ( 1 ) out of the housing ( 100 ) into the volume (V) of water (W),

measuring a current concentration of oxygen dissolved in the main water stream (W′) sucked into the housing with an oxygen probe ( 6 ) integrated into the housing ( 100 ),

transmitting the current concentration of dissolved oxygen wirelessly to a hand-held device ( 9 ) of an operator, and

controlling the flow rate of the injected oxygen,

such that the measured current concentration approaches a pre-defined reference value, the device comprising:

the housing ( 100 ) configured to be submerged into the water (W),

wherein the housing ( 100 ) includes at least one water inlet ( 101 ),

an oxygen inlet ( 102 ), and

at least one water outlet ( 103 ) for discharging the oxygen enriched water stream (W″) out of the housing ( 100 );

the pump ( 5 ) being in fluid communication with the at least one water inlet ( 101 ) for sucking water (W) from the volume of water which is surrounding the housing ( 100 ),

wherein the pump ( 5 ) is configured to generate a main water stream (W′);

means ( 200 ) for the injecting of the oxygen, the oxygen being supplied from the oxygen inlet ( 102 ) into the main water stream (W′); and

an oxygen probe ( 6 ) integrated into the housing ( 100 ) of the device ( 1 );

wherein the oxygen probe ( 6 ) comprises a measuring surface ( 6 a ) for measuring the current concentration of the dissolved oxygen;

wherein the measuring surface ( 6 a ) is at a tip of the oxygen probe ( 6 ); and

wherein the device ( 1 ) is configured to direct a side water stream (S′) of the main water stream (W′) from a first orifice O at a junction between an outlet pipe of said pump and said means ( 200 ) for the injecting of the oxygen into the main water stream (W′), along the measuring surface ( 6 a ) for measuring the current concentration of the dissolved oxygen, and through a second orifice O′ out of the housing.