An electrostatic precipitator is a tool used to extract suspended dust particles from a gas. It uses high power charging to collect particles from charged plates.
It has electrode cables that are stored at high levels. This produces a corona that emits electrons. The negative net charge will be obtained by dust particles and those are collected by collection plates.
The air velocity between the plates is kept low to allow the dust particles to fall and settle to the ground. The electrostatic precipitator can remove more than 99% of the current matter in the extinction of a thermal power plant.