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100 grams of lime was mixed with tap water and stirred to form a slurry. This was fed through the vertical column. The flow rate was 30ml/min in both apparatuses. All the other procedures were the same as described on materials and methods.
Results and Discussion
This was the first experiment in which pressure and temperature gauges were implemented. Those devices control the influent water, avoiding floods and providing a continuous source of tap water.
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The second half of the experiment corresponds to a new addition of 100 grams of lime after 45 hours. Low readings are due to pH probe calibration. It can be observed that the increase in pH was dramatic and that both reactors remained above 12 for 19 hours (A1) and 27.5 hours (A2). Despite these promising results, the high fluctuation and the readings above 12.6 make them inaccurate and nullify the data. It is necessary to repeat the experiment when there is more certainty regarding the pH probe readings.
Figure 1A. Experiment 4 performance. First 40 hours. (pH vs time)
Figure 2A. Experiment 4 performance. Second 40 hours. (pH vs time)
