An electrochemical reactor for aqueous solutions with high electrical resistance

An electrochemical reactor that enables electrochemical reactions to be carried out in poorly conducting electrolyte media with high electrical resistance is described. The cell consists of a polymer electrolyte membrane 1 in direct contact with at least one electrode 2, in water containing little or no supporting electrolyte. A further electrode 2 can be either in direct contact with the membrane 1 or separated from it. The reactor enables electrochemical reactions to proceed without the need to add supporting electrolytes, such as, sulphuric acid or metal halides, because this is not always possible or desirable. The reactor may be used for the electrochemical de-nitrification of potable water. The electrodes may possess a catalytic layer and be of a porous or reticulate construction.