Gold processing from sludge leaves residents breathing polluted air in Coimbatore Updated: Updated: May 24, 2021 16:53 IST Workers who filter traces of gold from sludge, use burning as part of the process, and residents in the neighbourhood have complained that the noxious smoke could pose a health threat Share Article AAA A man engaged in filtering gold from the fine sediment of sludge near the sewage treatment plant of Coimbatore Corporation at Ukkadam | Photo Credit: WILSON THOMAS Workers who filter traces of gold from sludge, use burning as part of the process, and residents in the neighbourhood have complained that the noxious smoke could pose a health threat