The Process of Treating Waste Water In easy terms the wastewater treatment can be defined as a process in which the wastewater from industries and households is processed to reintroduce it into our ecosystem. This water is then transported to wastewater plants through several sewage systems. In the treatment plant it undergoes different processes before being recycled and disposed off. These plants also have the ability to handle dirty storm water but this generally requires a separate system as storm water might contain bigger particles and different impurities which, if not handled with care, can damage machinery and pipes of treatment plant. After reaching treatment plant, the waste water is treated in three stages. They are named as primary, secondary, and tertiary stages. These stages are discussed below for further elaboration. Pre- Treatment Stage All the visible impurities are removed from the water at this stage. Objects like plastic bags, stones are removed from the water using rakes or large screens. Then the water is passed to the settling chamber where those smaller objects are removed that werenâ€™t removed the first pre-treatment stage. This stage consists of a big tank where water remains for some time to allow the particles to settle down, so they can be removed. After this process, skimmer is used to remove grease or fats that float on the surface of the screen. Primary Stage This stage is also similar to the previous one but here the remaining sludge is settled in the chambers, and the remaining grease or fat is removed from the water. The solid waste like sludge is removed here after treating it chemically. Sometimes it is treated inside machines so that it can be used as fertilizer. Secondary Stage In this stage we dispose of biological waste like detergents, soaps, chemicals or human waste. This is done by introducing bacteria in this water which in the end works by decomposing the solid mass into small parts and makes the rest if the waste and impurities clump. At the end of this process, water is again brought to a large tank where all the remaining impurities are allowed to settle down at the bottom of the tank. Tertiary Stage In this last stage the waste water is passed through sand to remove suspended particles and then this water is passed over particular carbon filter for removing toxins. Lagoons are used by some waste water plants to settle the sediments after which microbes react to remove any harmful materials and substances. Finally the water is further filtered by chlorine.
At the end of this process, this waste water is reintroduced into our ecosystem and is not ultimately used for domestic consumption. Some modern plants do further purification systems to make the water pure enough to be used by humans for drinking purpose. Author Bio: The author of this article is an expert of water filtration systems and writes occasionally about domestic and industrial waste water treatment.