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Tube settlers are used to test effluent turbidity at different locations. The tube settlers were designed to mimic the sedimentation tank that would traditionally follow the flocculator. Tube settlers were chosen because they provide an inexpensive way to sample and create a minimal disturbance within in the tank. Using this method, different locations of the tank can be sampled. Data gathered can be used to assess how each stage of the tank is affecting the final effluent turbidity. The three glass tube settlers were designed using the following equipment.
Equipment:
- Glass tube settlers (3)
- Length: 60 cm
- Diameter: used were of 60 cm length and 2.5 cm
- Peristaltic pump
- Turbidimeters (3)
diameter. A peristaltic pump was used to transport the water to the three turbidimeters.
Once the equipment was gathered, the next step was to design the flow rate for the peristaltic pump. The following assumptions were used in the calculation for the flow rate :
Assumptions:
- The were that the optimum angle for tube settler is 60°
- The and the critical velocity is 10 m/day.
Sixty degrees is used because it is the angle at which the distance required for floc settling is minimized and still allows the solids that settled on the side of the tube to slide down. The critical velocity is taken from a range of accepted values and has been found to be the critical velocity in previous plants in Honduras. The flow rate was calculated using the following equations.
Schematic of the Data Collecting Settling Tubes.
Dimensions and Variables chosen:
- b = diameter = 2.5 cm
- L = length of the tube settler = 60 cm
- alpha = optimum angle = 60°
Unable to find DVI conversion log file.
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