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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.
The unexpected results come from measuring dissolved oxygen concentrations at various points in the system. The results indicate that the sand filter is actually oxygenating the water further, not removing large bubbles. This requires some major rethinking of the way the system works, especially in improving aerator efficiency and pressure maintenance in the sand filter.