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Ecology & Environment
Pradeep Kumar

24/08/21 13:05 PM IST

Delhi’s new smog tower

In news

Delhi got a ‘smog tower’, a technological aid to help combat air pollution

Details of tower
  • The structure is 24 m high, about as much as an 8-storey building — an 18-metre concrete tower, topped by a 6-metre-high canopy. At its base are 40 fans, 10 on each side.
  • Each fan can discharge 25 cubic metres per second of air, adding up to 1,000 cubic metres per second for the tower as a whole.
  • Inside the tower in two layers are 5,000 filters.
  • The filters and fans have been imported from the United States.
How it works ?
  • The tower uses a ‘downdraft air cleaning system’ developed by the University of Minnesota.
  • IIT-Bombay has collaborated with the American university to replicate the technology, which has been implemented by the commercial arm of Tata Projects Limited.
  • Polluted air is sucked in at a height of 24 m, and filtered air is released at the bottom of the tower, at a height of about 10 m from the ground.
  • When the fans at the bottom of the tower operate, the negative pressure created sucks in air from the top.
  • The ‘macro’ layer in the filter traps particles of 10 microns and larger, while the ‘micro’ layer filters smaller particles of around 0.3 microns.
Source: Indian Express

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