Applications of pure oxygen in fish culture

Abstract The use of pure oxygen can increase the carrying capacity of a fish culture system when dissolved oxygen is the most limiting factor. The actual increase in carrying capacity will depend primarily on temperature, pH, and the efficiency of the solids removal system used. While the primary design parameter is the concentration of dissolved oxygen from the absorber unit, the concentration and partial pressures of other gases are also important. Due to change in the oxygen demand over the day, the ability to adjust the concentration of dissolved oxygen from the absorber unit may significantly reduce oxygen usage, but may reduce the overall system reliability. Important operating characteristics are dissolved oxygen concentration, absorption efficiency, utilization efficiency, and transfer efficiency. These parameters are all interrelated and the selection of the actual operating point may involve significant trade-offs between the various parameters. While the mass-transfer characteristics of the different types of absorption units are relatively well understood, operational procedures and constraints may significantly impact what can be achieved in practice. The ‘best’ type absorber unit for a given application will depend on site conditions, production schedules, and the layout of the rearing units. General design procedures are suggested for the design of pure oxygen systems.

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