The city will get an additional 12 MLD water for its usage in the next eight months. This additional water will be sourced from Thippagondanahalli (T.G. Halli) reservoir, into which recycled water from the Hessarghatta lake will be pumped.
Minister for Bengaluru Development and Town Planning K.J. George laid the foundation stone for a natural biological system recycling unit at Hessarghatta on Wednesday. The recycling system will treat water from Hessarghatta lake going into the T.G. Halli reservoir.
Mr. George said the recycling system would treat 12 MLD water, which would be used for the city’s needs. At present, the BWSSB’s water supply capacity is 1,400 MLD.
The project, which is being taken up at a cost of ₹11.49 crore — of which ₹9.93 crore has been given by Karnataka State Pollution Control Board — is expected to start functioning in the next eight months. The recycling system will be situated between Hessarghatta lake and the reservoir.
How the system works
Developed under the guidance of Israel-based company Ayala Water and Ecology, the Natural Biological System is based on the concept of phytoremediation where plants are used as a natural filter for cleaning water. It will contain a stretch of wetland on either side of the system. Solids and pollutants in the water that passes through this green filter, will get accumulated and degraded, thereby allowing the flow of clean water.
Mr. George also laid the foundation stone for underground drainage network in Hessarghatta village. The project has been approved at a cost of ₹23.45 crore and is estimated to be completed in two years. Congress MP M. Veerappa Moily, who was present, said the network would be useful to six villages around Hessarghatta.
A sewage treatment plant (STP) is also being planned at Hessarghatta. The government has called for tenders for the proposed 3 MLD STP.
The Thippagondanahalli reservoir, fed by the Arkavati, was constructed in 1933. Until 2010, the BWSSB used to draw 60 MLD water from the reservoir to supply to the city. This gradually reduced to 20 MLD, and by December 2012 the board stopped drawing water from there after the reservoir level plummeted to 6 ft. The reservoir has a storage capacity of 3.345 tmcft.