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Unfortunately, we realized that both the "Series of Orifices" and "PVC Cap as Orifice" designs do not generate enough head loss to dose with small amounts. Also, in order for the the "Spiral Tubing" design to successfully work, a extra tubing length of around 3.5 meters is needed; this is not feasible considering our desire to have a small overall filtration unit. Therefore, we need needed to look into other viable options for the design of the alum doser (which will be a model for the required chlorine doser as well).
As of currentlyAfter the rejection of the three options listed above, we are re-considerig considered the use of a float value to monitor the surface level of the alum solution. This should make dosing less variable and may help find a better solution to the orifice problem. Originally, we eliminated this design because we did not want to include small, hard-to-fabricate components into the design. Yet, this seems seemed like the only potentially successful option at the momenttime, and still currently. Also, we are looking into the addition of a flocculation component; yet, this can be thoroughly researched and considered more next semester.
Add more info. about new Point-of-Use Design Calculations and current final design of the point-of-use unit. Comment on how we omitted the alum doser and chlorine doser in the design (and how we will use "batch" system instead). Also, comment on why this schematic actually works: need 2-3 inches of water above foam based on graph in file.
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