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In our lab, we simulated the metal bars of the screening in a real facility with a piece of gridded plastic to remove all the large solids from the waste water.

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As the wastewater passes through the sewers, there are large metal bars that help to remove the large solids and allow the rest of the water into the further stages of the treatment plant.

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For our lab, we stirred the mixture in the beaker and saw that all of the solids that remained and large objects settled at the bottom of the jar which made them easier to remove.

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At the plant, a vortex is created inside of the chamber in order to get all of solids that remain in the water to settle at the bottom and can filter through the rest of the water. This is done so that no damage is done to the pumps or pipes in the future stages.

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For our lab, we used a spoon that was wrapped in pantyhose to help scrape off the remaining oil from the top of the water.

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At this point in the process, the water is pumped into a tank where the water settles and begins to separates, the oils float to the top and all the remaining fine solids sink to the bottom of the tank and are removed. The stuff scraped off the top is known as primary sludge, it is used for fertilizer or used to make compost.

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In the plant, they use numerous chemicals in order to kill the remaining bacteria, the water is then placed in tanks where UV light to remove bacteria and purify the water as well.

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In our lab, we used a added a solution to the water after the primary settling phase to remove the dissolved nutrients in the water.

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In our lab, we added bleach to the water as a disinfecting solution in order to kill the remaining bacteria in the water.

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For our lab, the secondary settling stage for us was moving the water into a clean beaker after the mixture was added from the previous stage.

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At the plant, the secondary settling stage is where the water is placed in a new tank where the secondary sludge floats to the top and is then scraped off by a machine, leaving a clear section of water in the top section of the tank.

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At the plant, they add a special mixture to the water in order to remove the dissolved nutrients in the water from human waste such as nitrogen, oxygen, or phosphorus. This stage takes place in special tanks called a bioreactor.

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After the process is completed, the water is returned back into a river using a main discharge pipe and the water is sent back into the water cycle to be used again.