The disinfecting effect of electric current passing between a contaminated aqueous liquid and an anode immersed in the liquid is enhanced by providing bipolar electrodes between the directly energized anode and cathode so that the flow channels for the liquid between the electrode faces are limited to a width of 3 mm or less, the auxiliary electrodes being insulated from each other and from the directly energized electrodes and disposed in such a manner that the potential difference between each pair of adjacent electrodes is equal.
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