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The water is put back into a river after the disinfection process so that it can be returned to the natural water cycle. To show this step in the experiment we just poured it down the sink. Below is a picture of the discharge process in real life.

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NEOTECUV INC. 2012 UV disinfection tank_0

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During this step chemicals like chlorine or even exposure to ultra violet light, work to kill any tiny living organisms in the water. This step is important because the clear water from the secondary settling tanks may look clear, but still contains a few tiny organisms. If not treated disease can be spread when the water is discharged. To show the disinfection step in the lab, the beaker labeled disinfection received two teaspoons of bleach. The beaker was then mixed with a spoon to help the disinfection process. Below is a picture of the lab representation, a comparison of the control wastewater and disinfection, and the real life disinfection process

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During this step the tiny organisms that feed on nutrients in the bioreactor, plus some of the germs from human wastes get together in heavy clumps of tiny organisms. These clumps sink to the bottom making a blown sludge layer, leaving a clear layer of water at the top. The secondary sludge is removed from the bottom of the tank, then dried and used as fertilizer. The clear layer of water is sent to disinfection after Secondary Settling. To model secondary settling in the experiment, the Secondary Settling Tank (S.S.T. beaker) is let standing on a flat surface for one minuet. This is to let the heavy clumps of tiny organisms(dry sand) and germs sink to the bottom making a layer of sludge.Also, assists in making the water clear. Then the water in the S.S.T. beaker was poured into the disinfection beaker, leaving behind the sludge. Below is a picture of the lap representation and the real life process

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During this step a mixture of tiny organisms are used to feed on the dissolved nutrients in the wastewater. Carbon, nitrogen and phosphorus are removed during this step. If this step was skipped and the nutrients were allowed to flow into a river it would reduce the oxygen levels that are vital for the health of a system of water. Because of the special mixture of tiny organisms some of the germs in the wastewater die because they can't survive the conditions in the bioreactor. To exemplify this step in the lab, dry sand was added to the bioreactor breaker. The dry sand represents the tiny organisms in the real life process. Then the sand and wastewater in the bioreactor beaker got mixed with a spoon and released a few bubbles. The tiny bubbles are from the tiny organisms storing some the nutrients inside them and converting them to gasses. Which is why we can see bubbles escaping. Attached is the lab representation and the real life process

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In this stage the water flows very slowly in large ta inks allowing fine solids and some of the germs to sink to the bottom of the tank, which the causes a thick grey layer of sludge. The primary sludge is removed from the tank, dried, then used as a fertilizer. Also during this stage the oils are scraped off the surface and buried in a landfill. To show this in the experiment the P.S.T. beaker was to stand flat for one minute allowing fine solids to sink to the bottom and the oils and leafs to collect on the surface. Then a spoon with a piece of a cotton ball covered in small netting was secured with an elastic to serve as the scraper. The P.S.T. beaker was the tilted on its side and the scraper was used to get rid of the oils and leafs floating at the top. After the P.S.T. beaker was poured into the Bioreactor beaker, making sure the primary sludge doesn't transfer into the bioreactor beaker. Attached is a picture of the real life process and the lab representation.

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After screening the grit is removed from grit chamber, taken to the landfill, and buried. Now the water is slowing down to allow the heavy grit to sink to the bottom. To show this in the experiment the  contents in the beaker labeled grit chamber were stirred slowly to allow the heavier contents to sink to the bottom. After the heavier wastes sunk the water from the grit chamber was poured in the the Primary Setting Tank(P.S.T.) beaker, being careful to leave the grit in the grit chamber. Attached is a picture of grit removal in real life, and with the lab representation.

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When wastewater first arrives at the treatment facility is goes through metal bar screens. The screens trap large objects, but allow the rest of the wastewater to continue through. In the experiement to show this the wastewater beaker and the beaker labeled grit chamber were used. First  netting with large holes was put over the grit chamber then secured on with a rubber band. The netting is supposed to represent the metal bar screens in real life. Then the wastewater beaker was poured into the grit chamber where all the larger objects like teabags and some stones were caught in the netting. Attached is a picture of the screening process along with the lab representation.

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Waste Water is dirty, used water that goes down the drains and toilets of homes, schools, businesses and factories. It is  made of water and a mixture  of wastes. Wastewater needs to be cleaned before being put back into a river. Wastewater is dangerous and can threaten the health of humans and the environment. In the experiment wastewater was made with: warm water, tea leaves(fine human solids), teabags(large objects like rags/ papers), small stones(grit), cooking oil( oils), and sugar(dissolved nutrients). Attached are pictures of wastewater in real life and the wastewater control from the in class lab.