The process gas enters the wet ESP horizontally, and is spread to a uniform flow profile across the entire filter cross-section by means of a gas distribution system. By means of the high voltage (78 to 135 KV) applied between the corona discharge electrodes and the specially designed honeycomb-type collecting electrodes, the process gas and the dust particles are electrically charged. On the route through the electric field, the charged particles are transported to the honeycomb type collecting electrodes by the electric field strength where they agglomerate with the existing dust particles and are flushed off by a periodically working washing system. The drain water flows from the honey comb through the gas distribution system to the filter bottom. The purified gas leaves the filter through the gas outlet hood