electrostatic precipitation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The removal of very fine particles suspended in a gas by electrostatic charging and subsequent precipitation onto a collector in a strong electric field.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a process that removes suspended dust particles from a gas by applying a high voltage electrostatic charge to the particles and collecting them on charged plates