Optimization of multi-stage velocity gradients in a cylindrical fluidized bed flocculator

- Multi-stage velocity gradients were set up in a cylindrical fluidized bed.
- Multi-stage velocity gradients fluidized bed (MGF) was beneficial to protection of flocs.
- The required velocity gradients could be achieved by formulating solid phase.
- Suspended solids and dispersed dyes could be removed more efficiently in MGF.