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This set of experiments attempts to replicate the grain size research performed with the previous experimental setup (link?). Additionally, the effectiveness of each of the components in the setup will be assessed with respect to theoretical expectations (Please be more specific. What components are being tested and what theoretical expectations are you referring to? It doesn't have to be a long paragraph, but a sentence for each so we know what you are talking about).

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. (Is the procedure the same but you are varying sand grain size or did you make modifications between the two methods? If so, please note the modifications you made, if not avoid vague language such as fairly similiar and state what conditions you changed and if you did not, state that you utilized the same procedure)

(Are you referring now to how to run an experiment? Perhaps create this as a link to another page as guidance) In Process Controller, configure the system so that the aerator air pressure is maintained at roughly 100 kPa. Fill the sand column with 60 cm of Sand 40 and adjust the flow rate on the pump forcing water through the sand filter to establish a bed expansion of 50%. For the first experiment, manual measurements of flow rate were performed by unhooking the influent water tube into the sand filter and allowing the influent to fill a large graduated cylinder over the course of a minute. In order to minimize changes made to the system, flow rate measurements for the second experiment were taken at the system effluent tube. The flow rates were roughly 225 ml/min and 485 ml/min for Sand 40 and Sand 30, respectively.

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The unexpected results come from measuring dissolved oxygen concentrations at various points in the system. The results indicate that the sand filter high pressure in the sand filter is actually oxygenating dissolving bubbles into the water further, . Large bubbles do seem to be removed 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.
(Discuss modifications you are going to make by the e-mail I sent your group yesterday)

(To be clear, the sand filter does not oxygenate the water. The high pressure through the sand filter will dissolve bubbles into solution. Please make this change throughout your documents)