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Abstract. In this research, hydrodynamic behaviour in a novel fluidized bed reactor (FBR) was studied using a residence time distribution (RTD) experiment. The RTD experimental result showed that the liquid flow pattern closely resembled plug flow behaviour. This research utilized the novel FBR under low hydraulic retention time (HRT) operation (without internal recirculation), and thus the novel FBR's performance should be further investigated. Two wastewater treatment applications were studied in this research. The first application was to use the novel FBR for denitrification at COD:NO3 .