A Sewage Treatment Plant works by circulating air to promote the development of microorganisms that break down sewage. The ultimate objective is to produce significantly cleaner, more ecologically friendly wastewater. It is comparable to a regular septic tank, but there are some important changes. Sewage treatment facilities, depending on its size, can handle the waste of a single commercial property or a group of residential homes. The overall design of a sewage treatment plant is not dissimilar to that of a septic tank. Sewage flows from the premises being serviced into the first chamber of the sewage treatment plant, just as it would in a septic tank.