Sub-surface multi-stage oxygenation system supporting net pen aquaculture

A multi-stage oxygenator system, comprising:

• a fluid-tight pressure vessel configured to be submerged and including a first section, a second section, and a third section;
• a baffle configured to divide the second section of the pressure vessel into compartments, the compartments comprising a first compartment and a second compartment;
• a water delivery mechanism configured to deliver water into the first compartment and the second compartment of the pressure vessel via the first section of the pressure vessel, the first section of the pressure vessel including an interface between the first section of the pressure vessel and the second section of the pressure vessel, the interface being configured to deliver the water to the first compartment and the second compartment to create a first flooded zone disposed within the first section and a second flooded zone disposed within the second section, the first flooded zone and the second flooded zone being filled with the water;
• a gas delivery mechanism configured to deliver a gas into the first compartment to create a first gas void in the first compartment, the gas including oxygen, the first gas void being disposed between the first section of the pressure vessel and the first flooded zone, the gas void being configured to allow water to fall through the first gas void to a first free surface of the first flooded zone;
• a gas connection through the baffle configured to allow gas to move from the first compartment to the second compartment;
• a gas release device disposed on a side of the second section of the pressure vessel and configured to release gas, the gas release device being positioned to maintain the first gas void and a second gas void at predetermined volumes, the second gas void being disposed between the first section of the pressure vessel and the second flooded zone;
• and
• a water discharge port disposed within the third section of the pressure vessel and configured to output treated water from the pressure vessel,
• wherein the third section of the pressure vessel connects the first compartment and the second compartment to allow water from the first flooded zone and the second flooded zone to mix to produce the treated water, and
• wherein the multi-stage oxygenation system is configured to be secured and stabilized at a predetermined depth.

A multi-stage oxygenator system, comprising:

• a fluid-tight pressure vessel configured to be submerged and including a first section, a second section, and a third section;
• a baffle configured to divide the second section of the pressure vessel into compartments, the compartments comprising a first compartment and a second compartment;
• a water delivery mechanism configured to deliver water into the second section of the pressure vessel via the first section of the pressure vessel, the first section of the pressure vessel including an interface between the first section of the pressure vessel and the second section of the pressure vessel, the interface being configured to deliver the water to the second section of the pressure vessel to create flooded zones in each of the compartments of the second section, the flooded zones comprising a first flooded zone disposed within the first section and a second flooded zone disposed within the second section, the flooded zones being filled with the water;
• a gas delivery mechanism configured to deliver a gas into the first compartment to create a first gas void in the first compartment, the gas including oxygen, the first gas void being disposed between the first section of the pressure vessel and the first flooded zone, the water falling through the first gas void to a first free surface of the first flooded zone;
• a gas connection through the baffle configured to allow gas to move from the first compartment to the second compartment;
• a gas release device disposed on a side of the second section of the pressure vessel and configured to release gas from the second section, the gas release device being positioned to maintain the first gas void and a second gas void at predetermined volumes, the second gas void being disposed between the first section of the pressure vessel and the second flooded zone;
• and
• a water discharge port disposed within the third section of the pressure vessel and configured to output treated water from the pressure vessel,
• wherein the third section of the pressure vessel connects the compartments of the second section to allow water from the first flooded zone and the second flooded zone to mix to produce the treated water,
• wherein the multi-stage oxygenation system is configured to be secured and stabilized at a predetermined depth, and
• wherein the first section of the pressure vessel includes a chamber configured to be flooded with water by the water delivery mechanism, and
• wherein the interface between the first section and the second section of the pressure vessel includes a plate with one of:
• a plurality of openings to form water jets, the water jets being configured to deliver the water to the compartments of the second section at a predetermined water pressure, or
• at least one nozzle, the at least one nozzle being configured to form water droplets, the water droplets being configured to deliver the water to the compartments of the second section at the predetermined water pressure.