Reevaluation of previous experiments with the new system

Objective

This set of experiments attempts to replicate the grain size research performed with the previous experimental setup. Additionally, the effectiveness of each of the components in the setup will be assessed with respect to theoretical expectations.

General Procedure

The procedure for each experiment in this set is fairly similar, with the exception of sand grain sizes, which are varied among the experiments. For the two experiments listed below, Sand 40 (0.49 mm - 0.57 mm) and Sand 30 (0.59 mm - 0.84 mm) were used for experiments one and two, respectively.

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For each emptying period of the bubble collector, data is collected through Process Controller. Analysis of the data collected can be quantified as a gas removal rate by considering the cross sectional area of the collector and the flow rate through the system. Please see the results and discussion for each experiment by clicking the links below.

Results and Discussion

Experiment 1 - Replicate of the Previous Sand 40 Experiment

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• When it was confirmed that the new aerator was not saturating water as much as possible, concentrations of dissolved oxygen were measured at various points in the experimental apparatus.

General Conclusions

The two experiments gave results that were somewhat different from those produced in last semester's experiments. Because the data log shows that the system was generally working as is expected, and because the new results were more consistent than last semester's, we plan to use the new results. The first experiment indicates clogging in the sand filter, for which we are currently devising a solution.

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