BWSSB to Use Solar Sludge Systems at STPs

25 Jul 2025 CW Team

The Bangalore Water Supply and Sewerage Board (BWSSB) is set to implement solar sludge drying systems at its Sewage Treatment Plants (STPs) to generate electricity and organic fertiliser from dried sewage sludge. This green initiative, under the World Bank-supported Urban Water Security and Disaster Management project, aims to make STPs financially self-sustaining while promoting environmental sustainability.

The systems will be installed at locations such as Saul Kere and Chikkabegur Lake. At Chikkabegur, the solar drying method will allow conversion of wet sewage sludge into reusable dry matter, which can then be repurposed as organic fertiliser. Solar panels at these sites are expected to generate electricity to support plant operations, reducing dependence on external energy sources.

The Rs 13.23 billion project includes a Rs 10 billion loan from the World Bank and aims to enhance wastewater treatment, flood control, and groundwater recharge across Bengaluru.

BWSSB plans to construct nine new STPs under the initiative, with about Rs 7.06 billion earmarked for the Bommanahalli zone. Works will include lake rejuvenation, pipeline networks, lift pumping stations, and green technology installations such as the 15 MLD unit at Chikkabegur.

BWSSB is already producing 2.5 MW of electricity from biogas at five major STPs, including those at K&C Valley, Vrishabhavathi Valley, Hebbal, and Bellandur. Building on this, the board now plans to establish a 500 kW biogas-powered plant at the upcoming 35 MLD STP in Anjanapura.

Officials said the integrated approach offers dual benefits—reduced operational costs and improved environmental outcomes—by combining solar and biogas energy with sustainable sludge management.

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