Manufacturer of Water Treatment Plants in India The Sewage Treatment Plant process is like the manner that a Septic Tank works but mechanical parts provide a process to help break down solids to create a cleaner, more environmentally friendly effluent. We are businesses finest for sewage treatment plant supplier. In the chamber, diffuser aerator or a surface aerator infuse atmosphere and oxygen to the waste and encourages good bacteria to digest the organic matter, breaking it down and purifying it. The effluent is normally 95% clean and prepared for discharge into local watercourses, ditches or land drainage systems, subject to consent by the Environment Agency, as it leaves the final chamber known as the settling chamber.