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In our lab, we used a gridded plastic covering to mimic the metal bars used in real life to strain/remove that larger objects.

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The metal bars separate the bigger pieces of garbage to prevent damage in sewer pipes.

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To simulate the grit removal process, we stirred the 'grit' mixture and watched as it settled to the bottom of the beaker. We also dumped the remaining grit into a landfill container at the end to act like the actual process of pouring it our into a landfill to be buried.

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The reason that grit removal can be so crucial is because if it is not enforced, the grit could eventually damage the pipes. The grit removed from the water is then taken to a landfill and buried.

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In our lab, to mimic a scraper we used a spoon with a pantyhose wrapped around it to absorb the floating oils and waste. The purpose of this is to scrape off the excess oils and bacteria floating at the surface of the water.

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To imitate the tiny organisms that are normally used in wastewater treatment, we used dry sand and ENO in our lab.

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In our lab, to simulate the process of transferring the clean water left behind after removing the heavier secondary sludge, we poured it into another beaker.

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After the grit removal process, the heavier germs settle at the bottom to be removed; a scraper then glides among the surface of the water to collect the oil and light surfaces that float to the top of the water (along with the sludge, that eventually also gets removed and treated).

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The secondary settling stage is where the heavier waste clusters together and begins to sink to the bottom. The drying process is then started to get rid of the germs. After it has been dried, the sludge may be used as fertilizer or compost.

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Biological Treatment (Biological Nutrient Removal Plant)

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Biological Treatment (Biological Nutrient Removal Plant)

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In between primary and secondary settling, the water acquires some dissolved nutrients like carbon (from human feces) and phosphorus (from soap). If emitted back into the environment, it could easily harm organisms; therefore must be removed by tiny organisms that feed on the nutrients.

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To imitate the stronger chemicals that are used to disinfect the water, we used household bleach in our lab to represent the depletion of the tiny organisms left in the water.

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The disinfection process is when chemicals like chlorine, ozone gas, or UV light kills tiny organisms in the water. This is to ensure that the water is the cleanest it can be before sending it back out into the rivers. Without the disinfection stage, the tiny organisms (germs and bacteria) that are left in the water could cause disease.

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At the end of our lab, we collectively poured our water into containers, mimicking the water being redistributed into lakes. If the wastewater treatment process was not carried out properly, there could be many harmful effects to the environment. Disease would be widely increased as well as bacteria; humans and animals that rely heavily on the water (if contaminated) could be negatively impacted.