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Stages Involved in Sewage Treatment

Wastewater or sewage from households is usually removed any contaminants present in it through a treatment process. Biological, chemical as well as physical processes are involved during wastewater treatment in order to remove any contaminants that are present in the sewage. Sludge is the term for the semi-solid waste that is sewage before it has been treated. This sludge usually goes through various treatment stages before it is suitable for land application or disposal. Another term used to refer to sewage treatment is wastewater treatment. Commercial, institutional, residential as well as industrial establishments are responsible for generating sewage. Dirty water from sinks, kitchens, showers, bathrooms and other places constitute sewage which flows into the sewers.

Sewage from the sewers is carried into the treatment plant using large pipes put in place. There are various stages involved during sewage treatment. The first stage is known as screening where large contaminants such as face wipes, diapers, sanitary, bottles, rags and other wastes are removed. These objects are removed first in order to prevent them from damaging the equipment used in the plant and prevent blockage as well. Special equipment is used in order to remove any grit that has washed into the sewer.

During the second stage, waste water is separated from the organic solid matter. Basically, organic solid matter is human waste and it is removed by getting the sewage into settlement tanks. In doing so, solid waste sinks to the bottom of the and is basically referred to as sludge. There are large scrappers found in the settlement tanks whose purpose is to scrape off the solid waste at the bottom of the tank and get them to another compartment for further treatment. There are aeration lanes in these treatment plants whereby wastewater is put once sludge has been scrapped off. The small bits of sludge that gets through to the wastewater are broken down using bacteria.
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During the final treatment stage, the wastewater goes through a settlement tank. The small bits of sludge in the mixture settles at the bottom once the bacteria acts on the wastewater. Once this happens, the water becomes free from any chemicals or other harmful substances. Filtration is the final stage where wastewater goes through a wall made of sand in order to remove any additional particles.
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By treating sewage, the water becomes fit to be released into the environment without any toxins or contaminants. Once the water is purified, people get to reuse it in their homes for domestic purposes without letting it go to waste.