How many sewage treatment plants are there in Chennai?
At present, Chennai has a capacity to treat a total of 558 million litres of sewage being generated daily in 11 units set up at six locations. Work is on to set up sewage treatment plants with a capacity to treat 228 mld in four more spots.
Do sewage treatment plants purify water?
The basic function of wastewater treatment is to speed up the natural processes by which water is purified. In the primary stage, solids are allowed to settle and removed from wastewater. The secondary stage uses biological processes to further purify wastewater. Sometimes, these stages are combined into one operation.
How many STP are there in Chennai?
The city has 12 Sewage Treatment Plants (STPs) at five locations namely, Kodungaiyur, Koyambedu, Nesapakkam, Perungudi and Alandur with total installed capacity of 727 MLD.
How does STP work in apartments?
STP treats the water that goes down drains before releasing it back into the environment. Usage of STP in apartments yields clean reusable water that can be used for other purposes like washing, toilet, watering plants and outdoor floor cleaning etc., so that you can save water.
What is the cost of STP?
The one-time cost of installing the STP is Rs. 14,00,000 for a 100 apartment community while running cost is just Rs. 25 per family per month. All the water is treated immediately and can be used for various purposes like flushing and gardening.
How much does an STP cost?
Sewage Treatment Plants for apartments depends on the occupancy, total buildup area, number of flats in the apartment, Typical cost range is between 14 lakh to 80 lakh for sewage generation between 50000 liters to 1000000 liters per day or 50 KLD to 1 MLD.
How do you treat sewage wastewater?
Treatment Steps
- Step 1: Screening and Pumping.
- Step 2: Grit Removal.
- Step 3: Primary Settling.
- Step 4: Aeration / Activated Sludge.
- Step 5: Secondary Settling.
- Step 6: Filtration.
- Step 7: Disinfection.
- Step 8: Oxygen Uptake.
How is sewage water cleaned?
Most wastewater undergoes secondary treatment as well as primary treatment. The most common method is to sprinkle or trickle the water over a bed of sand or gravel. As the water filters downward, it is put into contact with oxygen and microorganisms, which work together to break down the organic matter in the water.
