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In order to experimentally define the critical velocity at which floc roll up begins, a ramp state function must be employed flow rates through the tube settler were increased incrementally utilizing a ramp state function in process control software. Instead of cycling through constant velocities, a method used in previous experiments, the capture velocity starts at a specific point and gradually increases over a given length of time until it reaches the highest set caputure velocity.
By incrementally increasing `the flow rate through the tube settler capture velocity through the ramp state, we can compare the effluent turbidity performance over time. A critical velocity could be identified based upon effluent performance and compared to our theoretical model. to the theoretical capture velocity and identify the capture velocity at which The critical velocity is when the velocity on the outer edge of the floc particle is equal to the floc settling velocity. Any velocity exceeding the critical velocity is when floc roll up begins, . and this will be the critical velocity.
Using the same experimental apparatus as was used in Summer 2009 and Spring 2009, and the ramp state process controller function, we hope to prove that the understand if our theoretical model of floc roll up behavior is accurate describes system behavior. Ultimately, so that we can hope to minimize the floc roll up in the plate settlers and further reduce the effluent turbidity.
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By running the ramp state function on different tube settler diameterrsdiameters, we hope to further develop the relationship between plate settler size and floc roll up.
Experiment 1- Ramp State with 9.5 mm tube
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