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Assessment of U.S. Corps Aerators in the San Joaquin River for the Port of Stockton

Assessment of U.S. Corps Aerators in the San Joaquin River for the Port of Stockton. September 2004 Jones & Stokes Russ Brown, Tom Trexler, Megan Robinson. Goals/Objectives. Determine the current level of performance of both aerators

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Assessment of U.S. Corps Aerators in the San Joaquin River for the Port of Stockton

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  1. Assessment of U.S. Corps Aerators in the San Joaquin River for the Port of Stockton September 2004 Jones & Stokes Russ Brown, Tom Trexler, Megan Robinson

  2. Goals/Objectives • Determine the current level of performance of both aerators • Estimate the oxygen loads from the aerators and the oxygen transfer efficiency • Compare aerator performance to release of oxygen gas from jets and different aerator device (Biox Hose)

  3. View of Aerator Dock

  4. Measurement Efforts • Measurements in Front of North Jets while Operating Both Aerators • Measurements in Front of South Jets while using Oxygen Gas

  5. Measurements and Estimations • Measured Velocity and DO concentrations of upwelling and/or flow-away currents • Estimated flow-away or upwelling width and calculated flows • Estimated Oxygen Loads from upwelling or flow-away flows and DO pick-up (measured DO minus background DO)

  6. Operation of Both Aerators

  7. Operation of South Jets with Pure Oxygen Gas

  8. Both Aerators DO Pick-up of 0.78 mg/l (Back. DO = 3.2 mg/l) Total Flow-away Flow of 90 cfs Total Oxygen Supply Rate of 402 lbs/day (assuming 40 ft flow-away width) South Jets with Oxygen DO Pick-up of 2.19 mg/l (Back. DO = 2.9 mg/l) Avg. Upwelling Flow of 191 cfs Avg. Oxygen Supply Rate of 2270 lbs/day Oxygen Transfer Efficiency of 45% Summary

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