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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. 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. In Sewage treatment is also referred to as wastewater 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. Water treatment is usually a process and it occurs in various stages. Bottles, rags, face wipes, sanitary, diapers and other large contaminants are usually removed from the wastewater during the first stage known as screening. 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.

Separation of wastewater from organic solid matter is usually the second stage of sewage treatment. Basically, organic solid matter is human waste and it is removed by getting the sewage into settlement tanks. 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. There are aeration lanes in these treatment plants whereby wastewater is put once sludge has been scrapped off. 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. 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. The wastewater is then allowed to pass through a wall where it is filtered using a bed of sand in order to get rid of 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. People can even get to reuse water in performing household chores.