Faecal Sludge Treatment Plant at Devanahalli, Bengaluru

Location	Bengaluru	Supporting organization	BORDA, TMC-Devanhalli
Population Covered	~40000	Implementation Cost	INR 87,000 (1,219.87 USD)
Area of installation	1425 sq.m(Build up area 625 sq.m)	Inlet quality	BOD: 3500-50000 mg/l COD: 9000-25000mg/l
Funding Agency	The Bill and Melinda Gates Foundation (BMGF)	Compost quality	C:N (%)= 18.2:1 P:K(%)= 0.33: 1.014
Implementing Agency	CDD Society	Design Capacity	6, 000 liters/day
Sources of Faecal Sludge	Pits and Septic Tanks	Operational since	19th November 2015
Operation and Maintenance cost

Type	Cost (INR)
FSTP Operations	7,00,000 pa
Truck Maintenance	10,30,000 pa
Co-composting Facility`	7,00,000 pa

Location of technology

Google maps location: 13°15'11.1"N 77°42'26.0"E

Devanahalli 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.

The main treatment steps followed in this FSTP are solid-liquid separation, stabilization, dewatering of sludge and pathogen removal. The separated liquid component is also treated to meet discharge standards. The faecal sludge is conveyed to the FSTP through a desludging vehicle. The treatment modules for solid components are: Feeding Tank (FT) with screen chamber, Biogas Digester (BGD), Stabilization Reactor, Stabilization Tank (ST), Sludge Drying Bed (SDB) with Green House Solar Drier Roof (GHSD). Treatment modules for liquid components are: Integrated Settler, Anaerobic Baffled Reactor with filter chambers, Planted Gravel Filter (PGF) and Percolation pit. The treatment system also consists of a co-composting unit where the dried sludge from the SDB is composted with municipal solid waste.

Maintenance tasks

Desludging of BGD, ST, SR, ABR
Cleaning of filter material at PGF and SDB

Operation tasks

Cleaning of screen chamber
Operation of valves
Regular desludging of the stabilization tank and stabilization reactor
Removal of dry sludge from SDB
Turning of compost heap

Current Status

The plant is operation since 2015, more that 1.8 million l of FS has been treated. More than 19,000kg of co-compost has been sold to farmers so far. The O&M of the FSTP and Co-composting unit was handed over to ULB in July 2019.

A H Nagaraju
Chief Officer
Tel: +91-9900916888

Netravathi
Environment Engineer
Devnahalli Town Municipal Council
Tel: +91-7348907082

Consortium for DEWATS Dissemination Society
Survey No.205,Opp. Beedi Workers Colony, Kommaghatta Road, Bandemath
Kengeri Satellite Town, Bengaluru, Karnataka 560 060 E : bangalore@cddindia.org
P : +91 80 2848 6700/ 2194/ 2274/ 2262 | F : +9J 80 2848 2144 |

Last Updated: September 2019