Formulation of a Wind Energy Programme for Karnataka
There are two primary sewage treatment plants in Bangalore, one at Belur-Nagasandra Village near HAL and the other at Nayandanahalli on the Mysore Road, 11 km from Bangalore. The Belur plant has a processing capacity of 36 million gallons/day while the Mysore road plant has a capacity of 27 MGD. At present, the large volume of combustible gas produced at these plants is being flared. Recognising that the gas is a potential source of inexpensive and presently unutilised energy, KSCST initiated a project on the utilisation of sludge gas.
In the first phase of the study, the Working Group investigated the utilisation options for the Belur plant. A preliminary survey indicated that there were three potential users - HAL ( 7 km. approximately), Indiranagar (8 km. approximately) and NAL Wind Tunnel Center (1 km. approximately). The economics of utilisation favour a single user close to the digestor since piping costs can be kept at a minimum. Since the functioning of the NAL Wind Tunnel Center is severely restricted due to shortage of power, and efforts are being made to double the energy supply NAL, NAL was identified as the most attractive user for the gas. Preliminary computations indicate that 3 1/2 lakh cft/day of sludge gas should be produced, but actual measurements showed that there were significant leakages. These leaks have not been sealed by BWS & SB. The methane content of the gas is approximately 70% and 3 1/2 lakh cft/day of sludge gas of this composition is equivalent to 2.6 MW continuous supply of thermal energy.