Sewage sludge gasification assays were performed in an atmospheric fluidised bed reactor using air and
air-steam mixtures as the gasifying agents. Dolomite, olivine and alumina are three well known tar
removal catalysts used in biomass gasification processing. However, little information is available regarding their performance in sewage sludge gasification. The aim of the current study was to learn about the
influence of these three catalysts in the product distribution and tar production during sewage sludge
gasification. To this end, a set of assays was performed in which the temperature (750-850 °C), the inbed catalyst content (0,10 and 15 wt.%)and the steam-biomass ratio (SB) in the range of 0-1 were varied
with a constant equivalence ratio (ER) of 0.3. The results were compared to the results from gasification
without a catalyst. We show that dolomite has the highest activity in tar elimination, followed by alumina and olivine. In addition to improving tar removal, the presence of water vapour and the catalysts
increased the content of H2 in the gases by nearly 60%.
Sewage sludge gasification assays were performed in an atmospheric fluidised bed reactor using air and
air-steam mixtures as the gasifying agents. Dolomite, olivine and alumina are three well known tar
removal catalysts used in biomass gasification processing. However, little information is available regarding their performance in sewage sludge gasification. The aim of the current study was to learn about the
influence of these three catalysts in the product distribution and tar production during sewage sludge
gasification. To this end, a set of assays was performed in which the temperature (750-850 °C), the inbed catalyst content (0,10 and 15 wt.%)and the steam-biomass ratio (SB) in the range of 0-1 were varied
with a constant equivalence ratio (ER) of 0.3. The results were compared to the results from gasification
without a catalyst. We show that dolomite has the highest activity in tar elimination, followed by alumina and olivine. In addition to improving tar removal, the presence of water vapour and the catalysts
increased the content of H2 in the gases by nearly 60%.
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