Sewage sludge and digestate gasification in an atmospheric fluidized bed gasifier

Abstract The gasification of sewage sludge (SS) and digestate was investigated in a pilot-scale fluidized bed gasifier with an output 100 kW t . treatment these by-products is ongoing challenge for sustainable development. SS are most commonly used as fertilizers. However, regulations restrict their use, mainly because the content heavy metals, pathogens bacteria. Gasification instead application to agricultural land seems be more efficient, syngas can subsequently combined heat power (CHP) generation. A series measurements were carried out get better understanding process fuels study effects gasifying agent on composition, particulate matter (PM) tar. produced tar analyzed using gas chromatograph mass spectrometry (GC–MS). results showed that no ash slagging observed therefore it feasible operate at 750°C. lower heating value (LHV) from air comparable, 4.06 MJ·Nm −3 4.11 SS. addition steam had positive effect amount dew point, which below 150°C. Tar reduction 5037.3 mg·Nm 3566.3 7447.7 3390.3 Furthermore, concentrations individual compounds determined divided into classes.