Engineering Methodology for River and Stream Reaeration
Results of recent activities in river and stream aeration by artificial techniques are reviewed, and a rational engineering methodology is developed for future river and stream aeration projects. The results indicate that, with careful consideration of site factors, artificial aeration can be applied successfully to raise dissolved oxygen to 5 ppm, using mechanical surface aerators, diffusers, downflow contactors, and sidestream mixing. However, since the transfer of oxygen from air into water is relatively inefficient above 5 ppm DO, the introduction of molecular oxygen through sidestream mixing, U-Tubes, and possibly diffusers should be considered, depending on the volume of water to be aerated. In cases where DO may be maintained at levels lower than 5 ppm, systems using air are competitive with molecular oxygen, depending on site conditions.
Main Stacks, UC Davis Shields Library