TA 02.2 – Sedimentation Tank

With this equipment is intended to study and visualize in a continuous regime, the natural phenomenon called sedimentation, whereby particles that are denser than the fluid that contains them and in which they are dispersed, fall by gravity depositing in the bottom of the container.

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Description

Sedimentation is used to clarify all types of water, reducing turbidity. Depending on the characteristics of the suspension (heterogeneous mixture formed by solid particles dispersed in a fluid), the particles will sediment in different ways depending on the density of them, its concentration in the solution, and the density and viscosity of the fluid in which they are dispersed.

The sedimentation tank has a lower tank of mixture in which a suspension is prepared by adding the additive whose sedimentation we want to study. In addition, the mixing tank has a stirring system to prevent sedimentation of the suspension.

Learning Objectives
  • Study of the basic principle of separation of solids in suspensions by sedimentation tanks.
  • View and study the sedimentation process in a continuous sedimentation tank.
  • Determination of the efficiency of the sedimentation process for:
    • different concentrations of solids.
    • different flows.
    • different positions of the deflector plate.
    • different depths of the deflector plate.
  • Visualization and study of current lines for:
    • different concentrations of solids.
    • different flows.
    • different positions of the deflector plate.
    • different depths of the deflector plate.
Technical Data
  • Sedimentation tank:
    • Construction material: Transparent methacrylate.
    • Approximate capacity: 80l.
    • Dimensions: 1000 x 400 x 200 mm.
  • Suspension tank:
    • Construction material: Fiberglass.
    • Approximate capacity: 120l.
    • Continuous mixing system.
  • Other characteristics:
    • Anodised aluminium structure.
    • Flow control through pressure control system.
    • Recirculation pump. H= 20+160 m; Q= 21+10l/h; P= 0,75 kw. Special for operation with dirty water.
    • 2x Imhoff cones, capacity 1 l. A wiper blade is included.
    • 1x beakers 1 l.
    • 1x precipitate jug 2l.
    • Ink addiction system for better visualization of the phenomenon.
    • Includes a shovel for pouring of suspension material to the tank.
Requirements
  • Power supply: 230V/50Hz.
  • Running water intake.
  • Calcium carbonate is required for the practice.

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