Plate Settler Spacing Summer 2008 through Summer 2009
Summer 2009
Experiments Varying Alum Concentration
This section contains the experiments in which the alum dose was varied in order to test how well the selected geometry (d = 15.1mm) performed when subjected to non-ideal conditions
Experiments with the Velocity Gradient
The team has conducted physical modeling of the system to investigate the phenomenon of floc roll-up.
Filter Foam
In current plant designs, head loss through the entrance ports in the sedimentation tank is much greater than the head loss from flow through the plate settlers. Because head loss through the ports is much greater than head loss through the plate settlers, flow through each of the plate settlers in plants in Honduras is not equal. A geotextile foam was placed on top of the plate settler to create head loss to equalize the flow.
Spring 2009
Experiments with Flow Rates and Inner Tube Diameters
This section contains two related experiments. The first experiment varies flow rates and the inner diameter of the tube settler. From these results, the ideal L/d ratio is identified and held constant for a certain flow rate and inner diameter by varying the tube length.
Floc Blanket Formation
Experiments exploring the rate of formation and density of floc blankets.
Fall 2008 Preliminary Testing
Fall 2008
This section contains preliminary observations and data that preceded the experiments run during spring 2009, above.
Summer 2008 Preliminary Testing
Experiment Using Straws for Tube Settlers
These early experiments explored the impact of the diameter of tube settlers on effluent turbidity. Tube settlers were modeled using drinking straws.