Abstract
To separate the solid wastes, liquid-solid fluidized bed was used. The fluidizing particles were put in the column and fluidized by the liquid flow. The glass beads whose diameters were 60, 100, 200 and 500 µm were used as the fluidizing particles. The tap water was used as the fluidizing liquid. One sample (the substitution for solid waste: 8.0 mm in diameter) whose density is changed from 1200 to 1900 kg/m3 was immersed in bed, and the existing height of sample was examined for the different liquid velocities and the different fluidizing particle diameters, experimentally.
When the liquid velocity is low and the apparent density of particle bed is higher than that of sample, the sample floats on particle bed (floating area). As the liquid velocity increases, the apparent density of bed decreases and the sample becomes to suspend in bed (suspension area). Further increment of liquid velocity makes the sample be settled at the bottom of bed (settling area). The boundary of these areas changes for the different densities of sample, that is, as the density of sample is higher, the liquid velocities of boundary between these three areas become lower. The liquid velocities of boundary are estimated from the relationship between sample density and apparent density of bed. When the fluidizing particle diameter becomes smaller, the range of existing height of sample in bed becomes narrower at the suspension area.
