Hydrothermal carbonization of organic material with low dry matter content: the example of waste whey
Junge, Ranka; Koller, Christoph; ; Krebs, Rolf (2013). Hydrothermal carbonization of organic material with low dry matter content: the example of waste whey. Journal of Residuals Science &Technology, 10, 4. 179 - 186. Peer reviewed.; ;
Hydrothermal carbonization at 205°C was evaluated to process waste whey containing 5.9% of dry matter to a coal-like material and process water. Carbonization increased dramatically the heating value, with 15.0 MJ/kg for whey and 25.2 MJ/kg for coal, alongside the carbon fraction, from 38.0% (whey) to 60.4% (coal). Carbonization brought C/H und C/O molar ratios to typical values for brown coal. HTC process water showed a low N/P ratio, and could thus be interesting as phosphorus fertilizer. However, elevated concentrations of phenols and cyanides suggest that further treatment might be necessary.