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Stages Involved in Sewage Treatment The act of removing contaminants in wastewater from households is known as sewage treatment. In a water treatment plan, biological, chemical and physical processes are used to remove contaminants found in the sewage for the water to be safe for the environment. Sewage exists in a slurry or semi-solid state referred to as sludge. 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. Sewage is usually generated by commercial, residential, industrial as well as institutional establishments. Dirty water from sinks, kitchens, showers, bathrooms and other places constitute sewage which flows into the sewers. Once the wastewater goes into the sewers, it is carried by a large pipe into the treatment plant. Water treatment is usually a process and it occurs in various stages. The first stage is known as screening where large contaminants such as face wipes, diapers, sanitary, bottles, rags and other wastes are removed. Removal of these contaminants is usually done in the first stage in order to prevent blockage or damage of equipment used in the treatment plant. Sometimes, grit might get washed into the sewer which is why special equipment is used in order to get rid of it. 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. The solid wastes are thus able to sink to the bottom of the settlement tank and are 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. After the sludge is scrapped off, the remaining wastewater is put into tanks known as aeration lanes. The scrapping stage might cause small bits of sludge to get into the wastewater which are broken down further using bacteria present in the water.
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The wastewater is then taken to a settlement tank during the final treatment stage. Once the bacteria acts on the small pieces of sludge, they settle down at the bottom of the tank. 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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Sewage treatment is very important as once the process is over, the water can then be released into the environment without any contaminants or toxins. The water can be purified to be pumped into homes for people to use for domestic purposes without it getting wasted.