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Figure 1: Experimental Setup with Alum Dose
Experiments
Experiment 1: 25 mg/L Alum Dose
A preliminary experiment was run to determine if better filtration performance could be achieved after dosing 5 NTU raw water with alum. A very high dose of alum was used, 25 mg/L, which is fairly unrealistic. To achieve this alum dose level, it would be necessary to install another alum doser prior to the filtration unit.
Experiment
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Set 2: Depth Filtration
A series of experiments were run at a constant flow rate with a low, realistic alum dose of 1.5 mg/L in order to determine whether foam filtration acted as either a function of depth, or a function surface area.
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Raw Water Turbidity Process
The 5 NTU raw water turbidity level was acheived using the raw water turbidity process.
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