Water treatment process employing an anion selective membrane

The process according to the invention is suitable for eliminating organic contaminations and bacterial infections in water by using only electric current without the use of external oxygen source and without adding any oxidative chemicals. According to the process when preconditioning the water contaminated with organic materials and infected with bacteria for the purpose of drinking water the water is introduced to the anode space, where the anode space and the cathode space are separated from each other by anion selective membrane, while the hydroxyl ion containing solution is circulated through the cathode space. Hydroxyl ions passing through the membrane are converted to hydroxyl radicals on the anode, which by their strong oxidative activity intensively oxidize the organic materials, resulting in the control of bacteria.