Abstract: Disclosed is an apparatus for electrochemical treatment of waste water by electroflocculation. The apparatus uses an arrangement of electrodes and an anode scraping device, whereby the sword-shaped anode(s) are flanked by cathodes made in the same manner, on which the support structure for the anode scraping devices is supported. Transport of the oxide crusts scraped off the anode surface towards the lower reactor end is supported by a gas stream fed into the electrolytic gap through hollow sections which serve the purpose of spacers for the electrodes. The anodes may consist of several individual sheets, with intermediate layers for lowering the frictional resistance when withdrawing individual sheets. The liquid seal of the upper reactor side in the area of the scraping device is achieved by a plug of elastic, electrically nonconductive material.