Autoselective regenerating particulate filter

The present invention provides an apparatus and method for removing particulates from a gas stream. The apparatus comprises a ceramic filter 14, at least one electrode 32 and at least one conductor 40. The electrode 32 is located at an end of the filter 14 and produces an atmospheric glow discharge in order to oxidise carbon deposits trapped in the filter 14. The conductor 40 extends at least partially into the filter 14 and acts as a counter electrode. Through various arrangements of the electrodes and conductors, the present invention provides closer connection between the trapped carbon deposits and the electrodes. This improves the regeneration of the filter without increasing the size and/or weight of the apparatus. The conductor may comprise the end cap 15 of a filter cell a conductor extending internally along an axis of a cell or may comprise the housing 12 of the filter. Where individual cells carry HV electrodes these may be arranged in lines within the cell matrix to improve uniform oxidation of particulate matter.