The BMC is grappling with a major challenge: managing the massive amounts of sludge that will be generated by the city’s upgraded sewage treatment plants. The civic body has begun upgrading all eight sewage treatment plants (STPs) in the city, expected to be completed between 2026 and 2028. Once operational, these plants will treat around 2400 million litres of sewage daily.

Following treatment, approximately 23 to 24 per cent of the volume will result in sludge, posing a significant disposal challenge. It is estimated that about 500 tonnes of sludge will be generated each day. Civic officials said this waste must be scientifically treated to prevent land and soil pollution.