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. 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. Wastewater treatment is also another term that is used to refer to sewage treatment. Commercial, institutional, residential as well as industrial establishments are responsible for generating sewage. Sewage usually includes dirty water from toilets, bathrooms, kitchens, sinks, showers among other household water which goes 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. 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.
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. In the treatment plant, there are large scrappers used to scrape away the solid waste settled at the bottom of the tanks and is pushed to another compartment where further treatment is carried out. The other water is put into tanks referred to as aeration lanes. The small bits of sludge that gets through to the wastewater are broken down using bacteria.
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The final treatment stage involves wastewater being driven into 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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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. People can even get to reuse water in performing household chores.