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Today, on Earth, when the Ground water is depleting and with very low fresh water sources, its become necessary to find out another source of water or to save water by reuse of wastewater produced by our-selves. For the same, today world is trying to re-use the waste water. Re-use of waste water is possible by incorporating different type of waste water treatment plants in your respective premises. Sewage Treatment Plant is a big option by which waste water produced in the institution / property can be re-used and finally the raw water consumption can be reduced. Different technologies of Sewage Treatment Plant are available for different capacities from 1 KLD to 2500 KLD in different phases. The brief description about STP’s is. Raw Sewage flows through a bar screen chamber to an Oil & Grease Trap to an Equalization Tank. (oil skimmers are the optional provided in Oil & Grease Traps for oil reduction). The bar-screen is, so designed that it can be cleaned manually from outside the Tank. Two submersible solid handling pumps are provided in the Equalization Tank to pump the collected Raw Sewage to the Anoxic Tank for De-Nitrification of the Raw Sewage. The Denitrified sewage then overflows to Aeration Tank. An automatic level controller is provided in the Equalization Tank to turn the pump off at the low water level in the Tank and so to start the pump automatically when water level is high. Air is introduced in the Equalization Tank through submerged air diffusers, to prevent the sewage from becoming septic during long retention or low load conditions. The Raw Sewage that comes into the Aeration Tank is aerated by using Fine Bubble Diffusers mounted in a grid at the bottom of the tank. Facility is made to pull up the Diffusers for cleaning if necessary. Air is supplied to the diffusers by twin lobe rotary air blowers located in the plant room. The aeration system is designed in a way so as to achieve complete mixing of the sludge organisms with raw sewage in order to achieve a MLSS of between 2500 – 4000 mg/l in the Aeration Tank. From the aeration tank this mixed liquor passes into a Settling Tank / Settler / Clarifier. The liquid in the settling tank is maintained in quiescent condition allowing the solids to settle to the bottom of the clarifier for collection. The accumulated solids (Activated Sludge) is consistently pumped back into the aeration tank by sludge recycle pumps. This return sludge undergoes further digestion in the aeration tank and also provides the active organism needed to digest the incoming raw sewage. Excess sludge from the bottom of the settling tank is wasted into an adjoining aerobic digester cum thickener tank / Holding Tank. In this tank sludge is aerated. The air is shut off periodically and supernatant water is led back into the Equalization Tank. This way the sludge is thickened and its volume is reduced. The thickened sludge will be further solidified using a centrifuge or a filter press and the solid cakes will be used as manure in horticulture. The supernatant water from the Settler overflows to Filter Feed Tank, where chlorine is added to disinfect the water. Hence the tank is also called Chlorine Contact Tank. The treated and disinfected water from the Chlorine Contact Tank is passed through a Pressure Sand Filter followed by an Activated Carbon Filter and a Softener (optional) and then stored in a Treated Water Tank. Water From this tank is used for the gardening, Here the water fits to parameters of BOD < 30 ppm, TSS < 50 ppm, COD < 120 ppm.  For the water to make fit for Flushing or further processes, the Treated Water from Filters is further treated in UF Plants consisting of UF Modules / Membranes. The water from the outlet of UF plant fits to the parameter of BOD < 10 ppm, COD < 50 ppm, TSS < 10 ppm.