Sewage Treatment Plant
Working of Sewage water Treatment Plant (STP)
GSSS Institute of Engg. & Technology for Women is equipped with a Sewage Treatment Plant to minimize the use of potable water by recycling the sewage water collected from the hostel blocks, college and canteen.
The sewage water is purified by the following steps:
- Bar screen chamber: This chamber receives the water containing floating solid materials like plastic/paper/grit from the hostel blocks and canteen. These materials are collected and given to Mysuru City Corporation for proper disposal.
- Equalization tank: The sewage containing oil/grease/grit from the bar screen chamber is stored in equalization tank. The tank acts as buffer tank. Here soft materials are broken into smaller pieces by the constant agitation.
- Aeration tank: The water from the equalization tank is pumped into the aeration tank, where the water is kept agitated in the presence of compressed air for several hours for oxidation of biologically oxidizable materials by a high population of microbes. Then the water is passed into a clarifier tank.
- Clarifier tank: The aerated water is allowed stand for several hours without any agitation in this tank. The biomass solid is settled down in the clarifier tank due to gravity. A small amount of the biomass is re-circulated into the aeration tank for further oxidation of biologically oxidizable materials.
- The excess biomass/sludge in the form of thick slurry is passed into a sludge pit and kept under aeration until dewatering is carried out. Then the sludge is pressed to a high pressure to remove the remaining water. The pressed sludge obtained is used as manure.
- Sand filter container: The water from the clarifier tank is pumped into a sand filter container containing gravel, course sand and fine sand to remove the fine suspended particles, which are not settled down in the clarifier tank.
- Activated carbon filter container: The Activated carbon filter container contains finely powdered charcoal to remove organic pollutants. The organic pollutants/ organic wastes get adsorbed on the surface of the charcoal and improve the water clarity, colour and odour.
- Chlorinator: After the removal of organic pollutants/organic wastes, the filtered water is treated with chlorine to kill the pathogenic microorganisms.
- The chlorinated water is used for watering the gardens of the campus.