Bayer Aktiengesellschaft

Joachim Lemke

Bernhard Vosteen

Thomas Melin

Heinz-G&uuml;nther Weissenberg

A process is described for dewatering sewage sludge consisting of the combination of an acidic oxidative preconditioning with an inorganic post-conditioning, in which case the preconditioning comprises an acidification of the sewage sludge and a catalytic partial oxidation by addition of a substoichiometric amount of hydrogen peroxide and iron ions at a pH&lE;5 and then an inorganic post-conditioning is carried out in which the acidified and partially oxidized sewage sludge is admixed with alkaline earth, and in which case, in the inorganic post-conditioning, sufficient calcium hydroxide (Ca(OH) ) is supplied so that the pH of the limed sewage sludge is in the range from at least 9 to at most 11, in order thereafter to dewater the conditioned sewage sludge mechanically.

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Wuppertal, Germany

Joachim Lemke