Method for separating nitrates and nitrides from waste liquors

摘要

1. Process for removing nitrate and nitride residues from waste liquors and industrial waste waters, in particular from precipitated liquors occurring in the production of sintered electrodes for alkaline accumulators, in which, in the presence of a catalyst material which brings about the electrochemical oxidation of hydrogen in electrodes in fuel cells, there is added to the waste water solution a reductant which has a redox potential in the redox system reductant/oxidation product of the reductant which is more negative than the redox potential of the redox system impurity/reduction product of the impurity, characterized in that the nitrate-containing solution to be regenerated is supplied to a gap-shaped space which is delimited on one or both sides by the electrolyte sides of two hydrogen electrodes, while the electrodes are supplied with hydrogen gas from the rear or from the edges.