Publication Details

Reference Category Journals
DOI / URL link
Title (Primary) Wet oxidation of char—water-slurries from hydrothermal carbonization of paper and brewer's spent grains
Author Baskyr, I.; Weiner, B.; Riedel, G.; Poerschmann, J.; Kopinke, F.-D.;
Journal Fuel Processing Technology
Year 2014
Department TUCHEM;
Volume 128
Language englisch;
POF III (all) T41;
Keywords Hydrothermal carbonization; Wet oxidation; Chemical oxygen demand; Energy efficiency; Ion chromatography; FTIR
UFZ wide themes RU3;
Abstract Char–water-slurries from the hydrothermal carbonization (HTC) of paper and brewer's spent grains at 200 °C or 240 °C were subjected to wet oxidation (WO) by gaseous oxygen at 170 °C or 200 °C without pre-separation into solid and water phases. The aim was to improve the heat efficiency of the HTC process while preferentially oxidizing the undesired dissolved organic matter (DOM) in the process waters over the chars. Success of this treatment was evaluated on the basis of the distribution of the feedstock chemical oxygen demand (COD) between chars and DOM. Results provide evidence that DOM and char underwent oxidation with a decrease in COD-to-carbon ratios. This fact could be attributed to changes in the concentrations of lactic, acetic, and formic acid quantified by ion chromatography. In oxidized process waters formic and acetic acids clearly dominate. Processes underlying the oxidation of chars are more diverse as revealed by FTIR spectroscopy and affect both cellulose-like and aromatic chars. A promising finding is that DOM was oxidized to a higher degree than the chars and that sufficient heat is released under certain WO conditions to thermally sustain the HTC process. Combined HTC/WO reaction regimes can be optimized for each specific biomass.
ID 15281
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15281
Baskyr, I., Weiner, B., Riedel, G., Poerschmann, J., Kopinke, F.-D. (2014):
Wet oxidation of char—water-slurries from hydrothermal carbonization of paper and brewer's spent grains
Fuel Process. Technol. 128 , 425 - 431