Evaluation of pure oxygen systems at the Umatilla Hatchery. Task 1, Review and evaluation of supplemental O2 systems: Final report

摘要

Based on feed consumption, the oxygen requirement for the Umatilla Hatchery was computed. The oxygen requirement depends strongly on the minimum oxygen criteria. Two oxygen criteria based on effluent concentrations from the raceways were tested: (1) Saturation (depending on elevation and temperature) and (2) 7 mg/L (a criteria commonly used for flow-through salmon hatcheries). The results of the modelling for the two dissolved oxygen criteria cases are presented. An assessment of the oxygen contactors and oxygen supply system for the existing design currently planned for installation at Umatilla Hatchery resulted in findings that would improve efficiency, reliability, or other operations. The overall recommended oxygen injection method reflects considerations of cost, timing, efficiency, and reliability. 54 refs., 22 figs., 32 tabs.