Faecal Sludge Treatment Plant at Devanahalli, Bengaluru

Location: Bengaluru
Scale: Community
Implementing organisation: Town Municipal Council with technical guidance by CDD Society
Designed Capacity: 6-9 cubic metre per day
Area : 200 m2
Operational since : 2015
Capital cost: Rs. 50 lakhs
O&M: INR. Rs 6 Lakh
Devanhalli town has population around 23406 people. Most of the households depends on septic tanks and soak pits for sewage disposal. There are about 5110 septic tanks as per town municipal council. There is neither underground sewerage connection nor any organized septage treatment facility in the area which leads to washing of septage into existing open drains. The objective of this project is to establish a pilot independent septage treatment unit and treat it to prescribed standards.

For treatment, septage passes through five different units.

Feeding Tank (FT) with screen chamber is the first unit in which offer obstruction to the large solids. This screened septage enters Biogas Settler (BGS) where the sludge gets settled and liquid supernatant is formed on the top.

Sludge accumulated in the BGS will move to stabilizing tank and the stabilized sludge is disposed into Sludge drying beds for dewatering. This dried sludge can be used as soil conditioner.

The liquid supernatant from the BGS moves to a DWWT system which consists of 2 chambers of settler, 5 chambers of Anaerobic Baffled Reactor (ABR) and 1 chamber of Anaerobic Filter (AF). After this, it gets finally treated through a Planted Gravel Filter (PGF) bed.

This treated liquid can be reused for gardening.
Ms. Mamtha AS
Environment Engineer
Devnahalli Town Municipal Council
Tel: 9008401313