Geometry optimization of struvite crystallization fluidized bed [鸟粪石结晶流化床结构优化]

作者：Cai J.; Ye X.^*; Ye Z.; Chen S.

来源：Chinese Journal of Environmental Engineering, 2019, 13(9): 2092-2101.

DOI：10.12030/j.cjee.201812130

• Numerical simulation
• One-sectional fluidized bed reactor
• Phosphorus recovery
• Struvite

In view of the uncertainty and complexity in the geometry design of struvite-crystallization fluidized bed reactors, numerical simulation was first adopted to explore the turbulence intensity, classification characteristics and fines entrapment behaviors of fluidized bed reactors with different geometries under multi-particle systems. The simulation results showed that the one-sectional fluidized bed reactor was superior to the multi-sectional and cone-shaped fluidized bed reactor in classifying pellets and turbulent conditions. The fines retention efficiency cannot be significantly improved by installing sedimentation components in the precipitation zone. As for the consequences of experiments, no significant difference of phosphorus removal efficiencies was observed between the one-sectional fluidized bed reactor and the traditional multi-sectional fluidized bed reactor at different influent phosphorus concentrations (240, 480 and 1 000 mg?L-1). It was also proved that the one-section fluidized bed reactor had good capability in granulation, where particles with sizes larger than 1.25 mm took up the percentage of 88.1%, 96.4% and 70.1%, respectively. The experimental results validated that the reliability and rationality of the numerical optimization method. The simplified one-section fluidized bed reactor, which displayed good performance in phosphorus removal and product characteristics, was a promising struvite-crystallization fluidized reactor.

• 单位
  中国科学院大学