Wet Oxidation of Process Waters from the Hydrothermal Carbonization of Sewage Sludge

Weiner, Barbara; Breulmann, Marc; Wedwitschka, Harald; Fühner, Christoph; Kopinke, Frank-Dieter

Wet Oxidation of Process Waters from the Hydrothermal Carbonization of Sewage Sludge

2018

Weiner, Barbara | Breulmann, Marc | Wedwitschka, Harald | Fühner, Christoph | Kopinke, Frank-Dieter

Combing hydrothermal carbonization (HTC) of sewage sludge with wet oxidation of the resulting process waters (PWs) is a favorable economic process leading to a wastewater that is better amenable to biological treatments. Five PWs from HTC of sewage sludge and straw were oxidized with molecular oxygen. A good removal of chemical oxygen demand and dissolved organic carbon was shown. The oxidized waters proved good substrates for a subsequent anaerobic digestion. However, the oxidized PWs were identified as more toxic in germination tests with cress (Lepidium sativum L.) compared to the untreated PWs.

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