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How can the Pollution from Industrial Chimneys be Reduced?
Pollution from industrial
chimneys, for example from a coal
burning power station,
can be reduced by using electrostatic
charge.
As well as the waste gases from
burning
coal
(carbon dioxide
and sulfur dioxide) the chimney contains
many small particles of unburnt fuel (mainly carbon).
The chimney has a high
voltage negative grid across it and
this gives the small particles a negative
charge as they
go past and gain
electrons.
Further up the chimney there
are positively
charged plates which
attract the negatively
charged particles.
The particles of pollution build up on the
plates
until they are heavy enough to
fall down
into containers.
The containers and the plates are cleaned
periodically.
In this way,
much of the smoky pollution is removed
from the
chimney before it can get out into the
atmosphere.
Particles in the atmosphere
contribute to global dimming.
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