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Is the biochar produced from sewage sludge a good quality solid fuel?
- Pulka, Jakub, Wiśniewski, Dariusz, Gołaszewski, Janusz, Białowiec, Andrzej
- Archives of environmental protection 2016 v.42 no.4 pp. 125-134
- ash content, biochar, energy, fuel production, fuels, heat, lignocellulose, sawdust, sewage sludge, sulfur, temperature, torrefaction, volatile compounds
- The influence of sewage sludge torrefaction temperature on fuel properties was investigated. Non-lignocellulosic waste thermal treatment experiment was conducted within 1 h residence time, under the following temperatures: 200, 220, 240, 260, 280 and 300°C. Sawdust was used as lignocellulosic reference material. The following parameters of biochar have been measured: moisture, higher heating value, ash content, volatile compounds and sulfur content. Sawdust biochar has been confirmed to be a good quality solid fuel. High ash and sulfur content may be an obstacle for biochar energy reuse. The best temperature profile for sawdust torrefaction and fuel production for 1 h residence time was 220°C. At this temperature the product contained 84% of initial energy while decreased the mass by 25%. The best temperature profile for sewage sludge was 240°C. The energy residue was 91% and the mass residue was 85%. Higher temperatures in both cases caused excessive mass and energy losses.