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Results and Discussion
The sedimentation rate velocity and the residual turbidity of flocculated suspension are important properties in a flocculator. The Spring 2009 team evaluated quantitatively the effect of shear velocity on these parameters. To do so, they used the flocculation residual turbidity meter (FRETA) developed by the AguaClara team and a data processor (MathCAD file) to analyze automatically.
Our goal for these first experiments was to familiarize ourselves with the apparatus and the data processor (MathCAD file) made by the previous team (Spring 2009) and to try to replicate one of their last experiments to make sure that the apparatus and the MathCAD file were working properly.
Flocculator length | Flow rate | Influent Turbidity | Alum dose |
|---|---|---|---|
2796 cm | 3-19 mL/s | 100 NTU | 45 mg/L |
Table 1: Parameters for the Fall 09 experiment
The experiment was conducted with the parameters showed in table 1. The parameters were based on one of Ian's experiment (data from 5/13/2009) conducted with the same parameters, except for the flow rate varying from 4 to 19 mL/s and the turbidity set at 50 NTU(see MathCAD file attached). Figure 3 shows the plot of the effluent turbidity, during the settling, state as a function of time and flow rate. The flow is in fact changing at each state and we can see that the turbidity is decreasing at each settling state.