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Current & Future Research
Prompted This research was prompted by the partially exposed pipeline leading to rising flocs observed at the San Nicolas AguaClara plant.
Temperature gradients cause deterioration of performance in tube settlers even when the total flow through the tube settler is controlled. A 0.75 C/hr temperature gradient
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showed a very different flow pattern than the 0 C/hr control.
Preliminary analysis of the effects of floc density difference due to the floc consisting of warm water and then settling into cold water suggests that this density difference is not sufficient to cause a failure in sedimentation. The lift on a sphere in a velocity gradient is also insufficient to prevent flocs from settling in a tube settler.
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