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After the water is disinfected, it gets put into a river so that it can return to the water cycle. In the lab, after the water was disinfected it was disposed in the sink.

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Disinfection is the process that uses chemicals, such as chlorine, to kill tiny living organisms in the water. In real life, chlorine gas is added to the water in the disinfection tank. In the lab, 2 tablespoons of bleach were added to the water inside the beaker and it was stirred with a spoon.

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In real life, when the small organisms feed off of the nutrients, some of the germs from human waste cluster together. During secondary settling, the water inside the large tanks slows down so that the tiny clumps of organisms can sink to the bottom to form a brown sludge that is called secondary sludge. A clear layer of water is left at the top. In the lab, the S.S.T. stood on a flat surface for one minute. After the minute, the "sludge" sank to the bottom.

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Biological treatment is a process that uses small organisms that remove the dissolved nutrients  such as nitrogen and carbon in wastewater.

In real life, the process happens in tanks called bioreactors. Sometimes, the tiny organisms store some of the nutrients in themselves and turn them into carbon dioxide gas and nitrogen gas. In the lab, dry sand and ENO's were used to represent the tiny organisms. The sand, the ENO's and the water were mixed until there wasn't any more bubbling.

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In this step, primary sludge is removed from the water. Primary sludge is untreated human waste.

In real life, the water flows slowly in large tanks. This allows the sludge to settle at the bottom of the tanks while the lighter substances, like oil, float to the top. In the lab a small piece of cotton wrapped in a small piece of pantyhose material was attached to a plastic spoon, this represented a scraper. The beaker was tilted to the side and the "scraper" scooped off the leaves and the oil.

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Grit removal is a process that removes stones, sand, and soil from the water. Removing the grit is important because it could damage the pipes. The grit that is removed is buried in landfills.

In real life, the grit is removed in the grit chamber. In the grit chamber, the water is slowed down so that the grit can sink down to the bottom. In the lab, a spoon was used to quickly stir the mixture inside the beaker. The grit gathered at the bottom.

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Screening is a process that is necessary to remove large objects from the water because they can damage pipes. The large objects that are removed are buried in landfills.

In real life, the wastewater passes through metal bar screens that trap the large objects. Some of the large objects that are trapped include paper and plastic objects. In the lab, a small piece of plastic netting attached to a bottle with a rubber band acted as the screen that trapped the objects. The objects that were trapped by the simulation were rocks and small pieces of tea bags.

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Wastewater is a mixture of water and dirty waste. It is the  used water that goes down drains from places such as houses and schools.
Wastewater goes to sewers that carry it to get treated. It is imperative that wastewater is treated because the waste found in the water is detrimental for the health of humans and it is harmful to the environment.