Filtering device and method for treating a polluted air stream

摘要

This invention relates to a filtering device (10) and method for extracting pollutants from a zone. This invention further relates to a corona discharge reactor (16) and filtration unit for treating a polluted air stream. This invention yet further relates to a method of treating pollutants in a gas stream and to a method of generating a corona discharge. The filtering device (10) includes a duct (12) defining an endless passage (13) extending through a preliminary condensing and impingement filter (14); a secondary coalescer filter (15); a corona discharge filtration unit (16); an ozone filter (17); an air advancement means in the form of a blower (18); and a pollutant collecting means generally designated by reference numeral (20).