The present invention relates to a method for cleaning waste and / or process water, in particular for the continuous cleaning of process water in the paper industry and in particular in waste paper processing, in which the water to be cleaned is subjected to hydrolysis and acidification in a pre-acidification step and the water treated in this way Water is then brought into contact with anaerobic microorganisms in an anaerobic cleaning step in order to break down impurities contained in the water, with at least one saccharide-splitting enzyme being added to the water before or during the pre-acidification step.
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