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During the fall semester of 2009, the Non-linear Chemical Alum Doser Team calculated is developing the two dual orifice sizes and developed the dual scale system for the lever arm . (Again, state the purpose of having a dual scale) Our goal was to meet the alum needs of the upcoming AGALTECA plant, which has a maximum flow rate of 6.3 L/s, maximum alum stock dosage of 125 gm/L, and a maximum target alum target rate of 100 mg/L. We determined that a nonlinear alum doser with a scale arm length of 0.5m, total lever length of .75m, tube diameter of 3/8 inch, and orifice sizing of .082 inch and .044 inch can meet the needs of the AGALTECA Plant. Other lever arm parameters can be found along with the calculations deriving them on the embedded Mathcad file.
Methods:
in order to handle turbulent flow chemical dosing used in conjunction with the newly designed Rapid Mix Tube. We have currently researched and identified the relationship between plant flow rate and alum dosage and lever arm components to include the dual scale and developed a Mathcad program to help us pick out components for our nonlinear dosing system. Mathcad file.
Theory:
We first identified the relat
Our method consisted of 1)establishing the relationship between plant flow rate, alum dosage, delta h (elevation difference or head loss?) between the constant head pump ( tank), and the dual scale (lever arm) 2)utilization of Mathcad Array function to link these variables, and` 3) a trial and error process to determine orifice size and the dual arm scale.
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