SEWAGE: THE CURSE OF WATER
Everyone in the world needs water to live, whether it is human beings or animals, water is necessary to live. Over the last few years the water facing more challenges than ever by sewage and industrial waste that slowly kills water and its belongings. It’s time to understand the value of water and protect that God’s by any means necessary. Sewage and rain water Most of the areas, we throw unwanted things in the ground or it may be settled on the roof by various reasons. When rainfall travels over the roof or ground, it may pick up some organic compounds, sediments, heavy metals and other solid particles. In some jurisdiction, some kind of treatment is needed to release those kinds of water in the waterways. Examples of treatment used for this are wetland, buried vaults with various media filters, and vortex separators. Control of sewage Some industries already installed some sort treatment plant to control the sewage to reduce the pollutant released by them. Those plants are called Sewage treatment plant. Some of the countries follow strict regulations on sewage treatment. It’s also one of the primary regulations to follow for setting up factories. While in most of the industries in developing countries not following these regulations. Resulting them to release much more pollutants to the waterways. Process in treatment plants In sewage treatment plant treatment involves in four stages
Pretreatment: it removes all easily collecting sewage such as plastic and other wastes before the cause any damages or to avoid blocking in the pump connected to the sewage. This waste water is flowing through bar screen to remove all large objects like cans, plastic, sticks etc.
Primary treatment: In this stage, sewage water flows through large tanks, called as “primary sedimentation tanks”. The tanks are used to settle sludge while grease or oil rises to the surface and are skimmed off.
Secondary treatment: secondary treatment is used to degrade the biological waste of the sewage such as human waste, food waste, soaps, and detergent. Most of the municipal plants treat the settled sewage liquor using aerobic biological process. Secondary system classified into 2 types.
Tertiary treatment: This is the final treatment given to sewage water before release into the waterways such as sea, oceans, rivers etc. more than one process is used in treatment plants. If disinfection is practiced in there, it is the final process called as “effluent polishing” Website: http://www.wettechafrica.com