Page History

...

The second experimental set up included a pressure sensor to determine changes in height in the stock tank. This would have theoretically reported when the system clogged and failed. Unfortunately, due to the set up of the lab, the sensor was subject to much unwanted noise and thus that data is not presentable. However, the beginning dates and end dates (and subsequent observations) are available for each experiment, and the information follows below. All information refers to the second experimental set up. For information on the first set up, see ... Restricting of Hypochlorinators midterm report At this point, it is important to differentiate between the attributes of precipitation due to atmospheric CO2 and the precipitate that forms with the initial preparation for the solution. Precipitation due to atmospheric CO2 in the set up will be more even and seem coated on and have almost a dust like appearance. It will also be fairly spread. Precipitation due to initial preparation will seem granule or spherical like, and will be localized.
On November 11th, 2008, the experimental set up was run with the parameters stated in the procedure. At this point, the float valve was in its original position (Figure 3). By November 13th, 2008, the float valve had clogged. After this experiment, the float valve was disassembled. The inside of the valve was entirely coated in precipitate. It is postulated that this is due to atmospheric CO2 because it was widely coated in precipitate.
On November 16th, 2008, the experimental set up was run with the parameters stated in the procedure. At this point, the float valve was in its new position (Figure 4). The set up used the solution from the first experimental run. An observation taken on November 17th noted that there were no signs of precipitation forming. By November 26th, the set up had not yet clogged, and the experiment was ended.
On December 1st, 2008, the experimental set up was run with the parameters stated in the procedure. The float valve was still in its new position (Figure 4). By December 4th, 2008, the set up had clogged. The set up was observed and the restriction of the flow was found to be at the orifice leaving the stock tank. The restriction appeared to be a large granule, which was from the original preparation and had not formed in the line. The restriction was removed, and the model ran well as was expected. The experiment had not clogged by December 7th, 2008, and it was ended.
On December 9th, 2008, the experimental set up was run with the parameters stated in the procedure, except this run was different because the solution had not been filtered through a cotton rag in order to see what effect this had on the clogging. The float valve was still in its new position (Figure 4). At time of this writing, the run had not yet ended.

...