Green technology at STPs to focus on sustainability
Bangalore Water Supply and Sewerage Board
(BWSSB) is set to integrate green technologies into its
Sewage Treatment Plants
(STPs) under the World Bank-supported Urban Water Security and Disaster Management project. The initiative will prioritise the scientific and sustainable management of wastewater through innovative models such as
solar power generation
and fertiliser production from sewage sludge.
Sludge drying systems in STPs
A BWSSB official said that solar panels will be installed to generate electricity at the Saul Kere STP. 'In Chikkabegur Lake, BWSSB plans to introduce
solar sludge drying systems
that will help produce both electricity and organic fertiliser from dried sewage sludge. The objective is to reduce dependency on external energy sources and make STPs financially self-sustaining,' said the official.
Mega project to enhance water resilience
The project, with an estimated cost of Rs 1,323 crore — including a Rs 1,000 crore loan from the
World Bank
— aims to improve wastewater treatment, groundwater conservation, and flood control across Bengaluru. BWSSB has already prepared detailed project reports and is ready to begin implementation.
Nine new STPs are proposed under the project, with a major portion of the funds — about Rs 706 crore — allocated for the Bommanahalli zone. The plan includes works like lake rejuvenation, laying of pipeline networks, lift pumping stations, and installation of
green technology
solutions at Saul Kere and a new 15 MLD unit at Chikkabegur.
Dual benefits through plants
A BWSSB official further explained that the solar sludge drying system will convert wet sewage by-products into reusable dry sludge using solar energy. This dried sludge can then be repurposed as organic fertiliser. If solar panels are also installed at these sites, they can simultaneously generate electricity to power the operations, making the process both eco-friendly and cost-effective.
BWSSB is already generating 2.5 MW of electricity at five major STPs: two units (60 MLD and 150 MLD) at K&C Valley, 150 MLD at Vrishabhavathi Valley, 100 MLD at Hebbal, and 90 MLD at Bellandur — all using biogas. Building on this model, the agency now plans to set up a 500 kW biogas-powered unit at the upcoming 35 MLD STP in Anjanapura, Bommanahalli zone, under the
World Bank project
.
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