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Incrementing G, Turbidity, and Gtheta
Dye Test
The sample cell was used for Tube Flocculation Research in spring of 2007 was tested for its flush time. The sample cell was connected to a peristaltic pump and UV-Vis spectrophotometer in the Environmental Teaching Lab in order to continuously measure the effluent of the turbidimeter cell. Red dye #40 was injected into the influent line in a pulse at four different concentrations: 0, 10, 20, 40 mg/L. Spectrophotometer is used to measure the light intensity. Based on the light absorption level of the sample at different wavelengths, we are to measure the concentration level of a certain fluid with respect to a standard. A set of standard for various concentrations was created by pumping red dye solution at different concentration into the sampling cell. After the preparation, we start running the test and collecting data. First, we open the red dye container while close the water container and turn on the pump. Thus, the red dye solution will be pump through the pipe and eventually fill up the tube. Then, we close the red dye valve and open the water valve at the same time as we collect data. As the cleaning begins, the water will flow into the tube, mixes with the red dye inside the tube and then outflow to the waste. The data will be collected near the exit of the outflow.
Heat Test
The experimental setup was run using Process Controller software. A Process Controller method was modified so that we can compare the settled turbidity values for the case with the light left continuously on with the case of the light only turned on briefly at the end of the Settle state. It automatically looped through four states: "1- Clean Flocculator", "2- Clean Effluent Turbidimeter", "3- New Flow and Sample", and "4- Settle State." In this first sequence the turbidimeter was left on throughout states 3 and 4 to measure the settled turbidity throughout the first sequence. Then, the method was extended to replicate states one through three as states five through eight. A ninth state was added called "9- Measure Settled Turbidity." State nine was created to allow the turbidimeter to be turned off for the duration defined by set point "Off Time" in state eight and turned on for the "On Time" of two minutes. After the tests are run the data measured during the "On Time" in "9- Measure Settled Turbidity" and the last two minutes of "4- Settle State" were compared.
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