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Conservative

Empirical

Filter Square Side(m)

1.5

1.5

Filter Height(m)

3.95

2.56

Clear Well Diameter(m)

6

6

Clear Well Height(m)

1.37

1.23



Figure 2: Agalteca Plant with Filter Designed from the Conservative Approach 

1) Our design based on simple hydraulics will work. However, it is a very large filter (see exact dimensions in Figure 2) and will not be sustainable economically. The material cost for construction will be too high.
2) The design based on the empirical Weber equation is smaller and less expensive. However, the validity of the empirical equations is not yet certain, inspite of our Fluidization Velocity Experiment. Therefore more testing needs to be done in pilot scale models.

3) If the empirical equations are valid, then we can change parts of the design, by changing the sand parameters. For example, lower the dimensions of the clear well by lowering the backwash velocity by decreasing the d60 and specific weight of the media.
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4)An additional advantage to Clear Wells is that the distribution tank does not have to be below the filtration tank, and in fact, it could be the clear well as well.
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Experiment Results

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