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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. This process usually involves biological, chemical as well as physical processes in order to get rid of contaminants and attain wastewater that is treated and safe for the environment. Sludge is the term for the semi-solid waste that is sewage before it has been treated. There are various treatment stages that the sludge goes through for it to be suitable for disposal or land use. Wastewater treatment is also another term that is used to refer to sewage treatment. Sewage that is found in sewers is usually produced by industrial, institutional, residential as well as commercial establishments. Sewage usually includes dirty water from toilets, bathrooms, kitchens, sinks, showers among other household water which goes into the sewers. There is usually a large pipe that carries the wastewater into the treatment plant as soon as it goes into the sewers. There are various stages involved during sewage treatment. Bottles, rags, face wipes, sanitary, diapers and other large contaminants are usually removed from the wastewater during the first stage known as screening. Since these contaminants might damage the equipment used in the treatment process or even cause blockage, they are removed at the first stage. Sometimes, grit might get washed into the sewer which is why special equipment is used in order to get rid of it. Separation of wastewater from organic solid matter is usually the second stage of sewage treatment. There are huge settlement tanks where the sewage is passed through in order to get rid of human waste. The solid waste that sinks to the bottom of the tank after the sewage has settled is 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 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 the process is over, the water is devoid of any harmful substances such as chemicals or toxins. 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. The water can be purified to be pumped into homes for people to use for domestic purposes without it getting wasted.