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In our lab we just poured our clean water into a sink, but at the end of the actual process the now clean water would be returned to a river.

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For our disinfection phase, we stirred bleach into the solution, which made the solution slightly more clear. This was supposed to represent when chemicals or UV rays are added to the water to kill any tiny organisms that may remain.

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In the secondary settling phase, we allowed the solution to sit for a minute while the secondary sludge settled at the bottom. Then, we poured it into the disinfection beaker while using a finger as a filter to make sure the secondary sludge remained behind. In the real process, water slows down, allowing the secondary sludge to settle at the bottom, and then the clear water at the top flows out. The secondary sludge is likewise taken to the sludge container, whereas in real life it could be used as compost or fertilizer.

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First the PST was poured into a new beaker, using a finger as a filter, then sand was sprinkled in to represent the special organisms that eat the nutrients. The main difference between our experiment and real life wastewater treatment plants is that we didn't use actual organisms that eat nutrients. Consequently, this step didn't have much of an effect on the actual quality of our wastewater. In the real life process, organisms are added that eat the Carbon, Nitrogen, and Phosphorous.

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In our PST step, we used an absorbent material to scrape the top of the water; this allowed room for human error which is eliminated in the actual process. In real life, they use an automated process in which a scraper that stretches across the tank in one direction moves along the tank in the other direction. Furthermore, in this step, the primary sludge settles at the bottom and doesn't move on to the next step.

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In our lab we simply poured the solution from one beaker to the other, trying our best to keep the grit behind. In contrast, in the real process a more accurate  approach it taken in which the heavy grit sinks to the bottom. The sludge in the experiment was taken to the sludge container, but in real life it could be used as fertilizer or burned.

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In our experiment we used netting that would catch the larger solid waste in it; this is the goal of screening. The main difference between our screening process and the actual screening process is that in actual wastewater treatment plants metal bars are used. In both processes the solid waste was taken to a landfill, but in our case the landfill was represented by a bucket labeled "landfill."

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Pictured above will be our photographs and below will be pictures from the actual process.

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This was the wastewater before being treated at all.