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The preparation state in Process Controller turns on the stirrers for 120 s to prepare the clay suspension and alum solution for the experiment. After 120 s, Process Controller automatically switches to the experiment state. This state turns on the peristaltic pumps to run the experiment. The stirrers are kept running to ensure consistency. The experiment is set to run for 3 residence times, after which Process Controller switches off all stirrers and pumps.
The demo plant was designed for a plant flow of 100 mL/min, with a residence time of 650 s. The above test was run for plant flows between 25 mL/min and 175 mL/min, at 25 mL/min intervals.
Results & Discussion
The graph below shows the effluent turbidities for various plant flows, plotted against dimensionless time, which is real time divided by the residence time of the plant at that plant flow.