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While the water at the actual plants have dissolved oxygen in excess of the 8 mg/L saturation level at atmospheric pressure, the experiments performed have usually involved water that is originally around saturation level or slightly below. We have decided that this is acceptable, since water under negative pressure has a lower DO saturation level so the water is supersaturated with respect to the lower saturation concentration.
Results and Discussion
The results for the first type of experiments w/ pressure- graph
The results for the second type of experiments w/ pressure- graph
From the above figures we can see From our experiments, we have found that the change in dissolved oxygen that occurs over the span of a few minutes is less than our expectationsdesirable. The first experiment uses water that has an initial dissolved oxygen level of — mg/L. After being put under partial vacuum for ---- minutes, we expect to see the dissolved oxygen level drop as bubbles form and rise, drawing dissolved oxygen out of solution. The change between the initial and final dissolved oxygen level is ---mg/L. For the second experiment, in which the water was pressurized and aerated for — minutes and then exposed to the atmosphere, we see that the change in dissolved oxygen is — mg/L. Contrary to our initial belief, the change in dissolved oxygen only slightly increased, indicating that aeration only slightly affects the rate of change of dissolved oxygen in the water and not to the desirable degree. Because of this, we are considering alternate solution methods.
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