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Dissolved oxygen may be generated by adding a peroxide to a fluid stream and then catalytically decomposing the peroxide to generate oxygen. As the peroxide is catalytically decomposed, the oxygen may solubilize in a surrounding fluid so as to provide dissolved oxygen. In some examples, the amount o

Dissolved oxygen may be generated by adding a peroxide to a fluid stream and then catalytically decomposing the peroxide to generate oxygen. As the peroxide is catalytically decomposed, the oxygen may solubilize in a surrounding fluid so as to provide dissolved oxygen. In some examples, the amount of peroxide added to the fluid stream is controlled such that substantially all of the hydrogen peroxide added to the fluid stream catalytically decomposes and yet the dissolved oxygen concentration of the fluid stream does not exceed a dissolved oxygen saturation limit for the fluid stream.

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1. A process for generating dissolved oxygen comprising: receiving from a source a fluid stream comprising water;adding hydrogen peroxide to the fluid stream so as to generate a dilute hydrogen peroxide stream having a concentration of hydrogen peroxide;pressurizing the dilute hydrogen peroxide stre

1. A process for generating dissolved oxygen comprising: receiving from a source a fluid stream comprising water;adding hydrogen peroxide to the fluid stream so as to generate a dilute hydrogen peroxide stream having a concentration of hydrogen peroxide;pressurizing the dilute hydrogen peroxide stream so as to increase a dissolved oxygen saturation limit of the dilute hydrogen peroxide stream and thereby provide a pressurized dilute hydrogen peroxide stream;passing the pressurized dilute hydrogen peroxide stream through a reactor containing catalyst so as to catalytically decompose the hydrogen peroxide into oxygen and water and thereby generate an oxygenated fluid stream having a concentration of dissolved oxygen; andreducing the pressure of the oxygenated fluid stream to a reduced pressure,wherein the concentration of dissolved oxygen in the oxygenated fluid stream prior to reducing the pressure is below a dissolved oxygen saturation limit of the oxygenated fluid stream at the reduced pressure. 2. The process of claim 1, wherein the concentration of hydrogen peroxide is less than 0.01 weight percent. 3. The process of claim 1, wherein pressurizing the dilute hydrogen peroxide stream comprises pressurizing the dilute hydrogen peroxide stream to a pressure ranging from 10 pounds per square inch (psi) to 300 psi. 4. The process of claim 1, wherein pressurizing the dilute hydrogen peroxide stream comprises pressurizing the dilute hydrogen peroxide stream to a pressure ranging from 30 psi to 150 psi, and reducing the pressure of the oxygenated fluid stream comprises reducing the pressure to a reduced pressure below 5 psi. 5. The process of claim 4, wherein the reduced pressure is atmospheric pressure. 6. The process of claim 1, wherein reducing the pressure comprises reducing the pressure of the oxygenated fluid stream uniformly so that localized areas of reduced pressure having reduced dissolved oxygen saturation limits do not form in the oxygenated fluid stream. 7. The process of claim 1, wherein reducing the pressure comprises conveying the oxygenated fluid stream through a pressure reducer while in a laminar flow regime. 8. The process of claim 1, wherein passing the pressurized dilute hydrogen peroxide stream through the reactor comprises passing the pressurized dilute hydrogen peroxide stream through the reactor at a temperature less than 100 degrees Celsius. 9. The process of claim 8, wherein the temperature ranges from 5 degrees Celsius to 50 degrees Celsius. 10. The process of claim 1, further comprising mixing the hydrogen peroxide with the fluid stream an amount effective to eliminate localized areas of high concentration hydrogen peroxide in the dilute hydrogen peroxide solution that, when catalytically decomposed, would otherwise generate localized areas of dissolved oxygen above the dissolved oxygen saturation limit. 11. The process of claim 1, further comprising generating the hydrogen peroxide in an electrochemical cell by reduction of oxygen. 12. The process of claim 1, wherein the source comprises one of a hydroponic growing reservoir, an aquatic animal farm reservoir, a well, and a waste water treatment reservoir, and further comprising returning the oxygenated fluid stream to the source. 13. The process of claim 1, wherein the catalyst includes at least one of a perovskite and a spinel. 14. A process for generating dissolved oxygen comprising: introducing peroxide into an aqueous fluid to form a dilute peroxide solution having a concentration of the peroxide;pressurizing the dilute peroxide solution and thereby increasing a dissolved oxygen saturation limit of the dilute peroxide solution;subsequent to pressurizing the dilute peroxide solution, catalytically decomposing the peroxide in the dilute peroxide solution into oxygen, thereby generating dissolved oxygen and forming an oxygenated fluid; andreducing a pressure of the oxygenated fluid and thereby decreasing the dissolved oxygen saturation limit of the oxygenated fluid,wherein introducing the peroxide comprises introducing an amount of peroxide that, when catalytically decomposed, provides a dissolved oxygen concentration in the oxygenated fluid below the dissolved oxygen saturation limit of the oxygenated fluid after reducing the pressure. 15. The process of claim 14, wherein the peroxide comprises hydrogen peroxide and the hydrogen peroxide ranges in concentration from 0.0001 weight percent to 0.009 weight percent. 16. The process of claim 14, wherein pressurizing the dilute peroxide solution comprises pressurizing the dilute peroxide solution to a pressure ranging from 10 pounds per square inch (psi) to 300 psi. 17. The process of claim 14, wherein pressurizing the dilute peroxide solution comprises pressurizing the dilute peroxide solution to a pressure ranging from 30 psi to 150 psi, catalytically decomposing the peroxide comprises catalytically decomposing the peroxide at a temperature less than 100 degrees Celsius, and reducing the pressure of the oxygenated fluid comprises reducing the pressure to below 5 psi. 18. The process of claim 14, wherein reducing the pressure comprises reducing the pressure of the oxygenated fluid uniformly so that localized areas of reduced pressure having reduced dissolved oxygen saturation limits do not form in the oxygenated fluid. 19. The process of claim 14, wherein reducing the pressure comprises conveying the oxygenated fluid through a pressure reducer while in a laminar flow regime. 20. The process of claim 14, further comprising mixing the peroxide with the aqueous fluid an amount effective to eliminate localized areas of high concentration peroxide in the dilute peroxide solution that, when catalytically decomposed, would otherwise generate localized areas of dissolved oxygen above the dissolved oxygen saturation limit. 21. A system comprising: a fluid source that provides a fluid stream comprising water;a peroxide source;a pump;a reactor containing catalyst;a pressure reducer; anda processor configured to control addition of peroxide from the peroxide source into the fluid stream so as to generate a dilute peroxide stream having a concentration of peroxide, control the pump to pressurize the dilute peroxide stream so as to increase a dissolved oxygen saturation limit of the dilute peroxide stream, and control passage of the pressurized dilute peroxide stream through the reactor so as to catalytically decompose the peroxide and generate oxygen and thereby form an oxygenated fluid,wherein the pressure reducer is positioned downstream of the reactor and configured to reduce a pressure of the oxygenated fluid down to a reduced pressure, andthe processor is configured to control addition of the peroxide so as to add an amount of peroxide that, when catalytically decomposed, provides a dissolved oxygen concentration in the oxygenated fluid below the dissolved oxygen saturation limit of the oxygenated fluid at the reduced pressure. 22. The system of claim 21, wherein the processor is configured to control the pump so as to pressurize the dilute peroxide stream to a pressure ranging from 30 psi to 150 psi, and the pressure reducer is configured to reduce the pressure of the oxygenated fluid to below 5 psi. 23. The system of claim 21, wherein the peroxide is hydrogen peroxide, and the processor is configured to control addition of the peroxide so the concentration of the peroxide ranges from 0.005 weight percent to 0.0095 weight percent. 24. The system of claim 21, wherein the processor is configured to control passage of the pressurized dilute peroxide stream through the reactor so as to catalytically decompose the peroxide at a pressure approximately equal to atmospheric pressure and a temperature less than 100 degrees Celsius. 25. The system of claim 21, wherein the pressure reducer comprises one of a fluid friction device and a valve.