Keywords
CFD simulation; Emergency treatment; Industrial-scale fluidized bed; Adsorption
Location
Session A1: Environmental Fluid Mechanics - Theoretical, Modelling and Experimental Approaches
Start Date
12-7-2016 8:30 AM
End Date
12-7-2016 8:50 AM
Abstract
Sudden river chemical spills accidents occurred frequently these years and caused great economic losses and odious social impacts. Although the current methods, such as the granular activated carbon package treatment in the Sudden Water Pollution Accident of Zhuozhang River of China, could make the water quality up to the standard, they resulted in the limited flow ability and low mass transfer capability, and also had some difficulty treating the unpredicted emergencies because of its location-specific treatment and time-consuming preparation work. Hence, a novel mobile industrial-scale fluidized adsorption process, which could address the above problems and was fast to deploy with simple operation, was developed in the paper for emergency water treatment. In the study, a lab-based Liquid-Solid Circulating Fluidized Bed (LSCFB) was prepared and the fluidized state was explored by validated computational fluid dynamics (CFD) models. The simulation results revealed that the particular uneven flow structure, which could weaken aniline removal performance, occurred with increasing superficial liquid velocity. Accordingly, an optimized distributor design was constructed by the established CFD models; notably, the effect of open angle on the fluidized state, which was often overlooked by previous studies, was mainly discussed. Then, the aniline removal rates of LSCFB pre and post optimization were compared. The experimental results demonstrated that dynamic adsorption capacity of the optimized LSCFB on aniline could reach approximately 70mg/g under the optimum operating conditions (initial aniline concentration of 100 mg/L, superficial liquid velocity of 3umf and sorbent dosage of 27g/L). By comparison with fixed-bed adsorption, the LSCFB possessed significantly higher adsorption rate constants and shorter hydraulic retention time, which indicated that LSCFB could meet emergency treatment requirements in a better way. Finally, the study developed the mobile industrial-scale fluidized adsorption process and estimated process parameters for aniline removal in the Sudden Water Pollution Accident of Zhuozhang River.
Included in
Civil Engineering Commons, Data Storage Systems Commons, Environmental Engineering Commons, Hydraulic Engineering Commons, Other Civil and Environmental Engineering Commons
Development of a novel mobile industrial-scale fluidized adsorption process for emergency treatment of water polluted by aniline: CFD simulation and experiments
Session A1: Environmental Fluid Mechanics - Theoretical, Modelling and Experimental Approaches
Sudden river chemical spills accidents occurred frequently these years and caused great economic losses and odious social impacts. Although the current methods, such as the granular activated carbon package treatment in the Sudden Water Pollution Accident of Zhuozhang River of China, could make the water quality up to the standard, they resulted in the limited flow ability and low mass transfer capability, and also had some difficulty treating the unpredicted emergencies because of its location-specific treatment and time-consuming preparation work. Hence, a novel mobile industrial-scale fluidized adsorption process, which could address the above problems and was fast to deploy with simple operation, was developed in the paper for emergency water treatment. In the study, a lab-based Liquid-Solid Circulating Fluidized Bed (LSCFB) was prepared and the fluidized state was explored by validated computational fluid dynamics (CFD) models. The simulation results revealed that the particular uneven flow structure, which could weaken aniline removal performance, occurred with increasing superficial liquid velocity. Accordingly, an optimized distributor design was constructed by the established CFD models; notably, the effect of open angle on the fluidized state, which was often overlooked by previous studies, was mainly discussed. Then, the aniline removal rates of LSCFB pre and post optimization were compared. The experimental results demonstrated that dynamic adsorption capacity of the optimized LSCFB on aniline could reach approximately 70mg/g under the optimum operating conditions (initial aniline concentration of 100 mg/L, superficial liquid velocity of 3umf and sorbent dosage of 27g/L). By comparison with fixed-bed adsorption, the LSCFB possessed significantly higher adsorption rate constants and shorter hydraulic retention time, which indicated that LSCFB could meet emergency treatment requirements in a better way. Finally, the study developed the mobile industrial-scale fluidized adsorption process and estimated process parameters for aniline removal in the Sudden Water Pollution Accident of Zhuozhang River.
