Sewage Water Treatment Plant
About your Sewage water treatment plant
Water Sciences' ,conceptualize, design, engineering and implements STP projects. Sewage treatment is process of removing contamination from household sewage. It includes physical, chemical and biological process to remove contaminants and produce environmentally safe treated wastewater. A by- product of sewage treatment is usually a semi solid waste or slurry called sewage sludge that has further treatment before being suitable for disposal on land applications.
Activated Sludge Process
The power of microbs to digest organic matter
Water Sciences' treats sewage water by conventional activated sludge process. The treated water meets the standards of state pollution control board and can be used for agriculture/ horticulture purpose & toilet flushing.
Activated sludge process is based on the principle that adequate maount of oxygen is passed through sewage containing microbes. Complate aerobic oxidation occurs, though slowly. However, if this aeration is carried out in presence of a part of sludge form previous oxidation process, the oxidation process is much quickened. this so added sludge form the previous process is known as activated sludge, sludge, since it contains organic matter inhibitated by numerous bacteria, etcs.
The process consist of mixing the sedimented sewage with proper quantity of activated sludge and the mixture is then send to the aeration tank, in which the mixed liquor is simultaneously areated and agitated for hours. During this process, oxidation of the suspended organic matter takes place.
First, oxidation of carbon takes place, followed by that of nitrogen to nitrates and nitrites. after aeration, the effluent is sent to clarifier tank, where sludge is deposited, clean and non purifying liquid (practically free form bacteria, etc.) is drawn off. A part of the settled sludge is sent back for setted fresh batch of sewage. while the reminder's disposed off by spreading uniformly over pebbles and gravel beds (sludge drying beds) for drying in open atmosphere. This dried sludge is called a sludge cake, Dried sludge cake' is usually spread on fields, returning organic matter and nutrients to the soil.
Form the clarifier tank water shall be collected in to chlorine contact tank where hypo-chlorite is dosed for the removal of disease-causing organisms. The disinfected water is then fed to sand and activated carbon filter for the removal of residual suspended solids, chlorine & BOD/COD before discharging the wastewater for final disposal.
A revolutionary technique for waste water treatment
In the waster treamtment process. Aeration is to be effective must transfer oxygen to the liquid for use by microorganisms to product a floc and mixing the liquor, diffused areation is effective method for areation by means of porous diffusers installed at the bottom of the tank in the areation process, oxygen transfer tanks place by molecular diffusion through the interface film between air and liquid and it increases in proportion to the interface area for a given air flow, as the number of bubbles increase, the surface area increases and the rise velocity of bubbles decreases the diffused areation transfer more oxygen to the liquid than mechanical areation.