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This is what our "wastewater" looked like after primary settling

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The screening process that we did is very different to how it is done in real life. In our lab, we poured the water through the screen into another container. However in real life, they have a much larger process which, as seen below. They remove the trash from the water instead of pouring the water from one container to the next. Both processes, however, remove the dirt, leaves, rags and any other large solid waste and get the job done.

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Finally, water is placed back to the river. However, in our lab, we just poured it down the drain, but all pipes lead to the ocean. If these steps aren't carried out, then there would be a lot of disease and it would be prominent in the water. It also would be detrimental for aquatic life, killing off many species. That's why these steps need to be done so that the water being discharged is clean and safe for the environment and everything in it.

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In our lab, to disinfect, we added two teaspoons of MILTONS sterilizing liquid into the rest of the water. However, in real life, people use UV lights, ozone gas or chlorine to kill tiny living organisms in the water. This allows the water to be safe to drink!

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Again, we let the water stand for a minute and allowed it to settle, causing any leftover solid waste to settle to the bottom. This is true for the real life process as well. And both of these processes are similar to the primary settling. After the solids settle, the left over water, leaving behind the rest of the grit, is then transferred to another container to be disinfected.

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In real life, people regularly use chemicals to rid the water of dissolved nutrients such as carbon, found in human feces, nitrogen, found in human urine, and phosphorous which is found in soap. However, in our lab, we did not use those chemicals and techniques chemicals. Instead, we used sand and ENO's to get rid of the dissolved nutrients.

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When transferred to the next container, water begins to settle, separating the solid waste at the bottom, water in the middle and sludge and liquid waste at the top. This is true for both processes, in real life and in the lab. Also, both processes rid the water of dirt and sludge which is the primary goal of primary settling.

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The grit removal process that we did was very similar to the one they use in real life, however it is on  a much smaller scale. In both instances, water is swirled around until all of the solid material like rocks and sand settles at the bottom. Then the water is transferred to another container, leaving behind the rocks. This is where primary settling occurs.