Chimneys in power stations use electrostatic precipitator to
attract soot particles. Electrostatic precipitator are filtration
devices that use electromagnetic charges to remove particles from
gases.
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There is a lot of variation in the applied DC voltages that
operate an electrostatic precipitator (ESP). Some work on a few
thousand volts (a few kV), while big industrial units might run on
upwards of 100,000 volts (100 kV).