Fecal Sludge Treatment Plant- Devanahalli

This is the first faecal sludge treatment plant in India. It is situated in Devanahalli, Bengaluru, India. It costed around Rs 1 crore. 

Area of this plant is 625 sqm.

Treatment capacity is 4000litres/day.

Households Served is 4,000

Dried Sludge Generated is 35,188 kgs

Total Sludge Treated is 821,900 litres

Total Wastewater Treated is 405

Process- Truck load of 4000 liters of discharged into the feeding tank which is screened in a screening chamber.  

The sludge water is left to settle. 

The water from this component is formed on the sludge. 

The separated water is taken to the anaerobic baffled reactor(ABR) 

The sludge from the feeding tank is taken to the biogas digester where the biogas is produced since it is anaerobic process. The process is shifted to the aerobic system, since the efficiency of the biogas digester was low. Hence, the sludge is directly taken to the stabilization tank where the water is further squeezed out. Sludge from this process settles down and separated water. This separated water is taken to the ABR. 

The water in ABR is made to screen through the baffles in the reactor. The treated water is fed to the plants. Further the screened sludge is collected in the collection pit.

Sludge from the stabilization tank is taken to the sludge drying bed, where it is left to dry. This is sent to the percolation pit. Percolation pit consists layers- Gravel bed at the bottom, sand bed on top and terracotta tiles on it. This helps to dry the sludge. The dry sludge is then collected.

This dry sludge is been mixed with the vegetable compost to make Co-compost. 

Process- 250kg of fecal sludge and 500kg of vegetable(wet) waste to create the co-compost. 

The fecal sludge and the vegetable waste are layered alternatively for 6 feet.

The layered waste is kept 4 days. It is then turned and kept for 7 days, again to repeat this cycle and kept 7 more days. This is the process of 20 days to form Co-compost.

This is then sold for Rs7/kg. This compost is used for growing grapes, banana, coconut, tomato, brinjal and jowar. 

Process Flow 

Feeder Tank 

Feeder Quality Tester

ABR - Anaerobic Baffled Reactor

Planted Gravel Filter 

Percolation pit 

Co-composting area

MY TAKE-AWAY:

• One treatment plant can feed as compost to so many industries- agriculture, water recycle, plant. It definitely serves as a long term investment.
• The process is not difficult. It is simple with logic.
• It prospers green by feeding all the plants nearby.
• It becomes income generation, also the way of the recycling the waste-water.
• They collect wet waste to create the co-compost. It prevents the waste filling the landfill.
• We found less labors on the site. To function this, there is a necessity to maintain.
• This uses mostly natural materials for the construction, which makes it nature-friendly.
• It was neatly kept with no smell.

By 

Kavina, Kruthika, Milan, Shimoli, Surabhi