...
In order to experimentally define determine the critical velocity at which floc roll up begins, flow rates through the tube settler were increased incrementally utilizing a ramp state function in process control software.
...
Using the same experimental apparatus as was used in Summer 2009 and Spring 2009, and the ramp state process controller function, we hope to understand if our theoretical model of floc roll up behavior describes system behavior. Ultimately, we hope to minimize the floc roll up in the plate settlers and further reduce the effluent turbidity. (Also, we want to potentially understand how to create flocs that will experience less roll-up and have better performance)
Results and Discussion
By running the ramp state function on different tube settler diameters, we hope to further develop the relationship between plate settler size and floc roll up.
...