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HM 142: Separation in Sedimentation Tanks

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Separation in Sedimentation Tanks

Separation in Sedimentation Tanks Separation in Sedimentation Tanks Separation in Sedimentation Tanks

Product Details

Technical Description
In sedimentation tanks, solids are separated out of suspensions under the influence of gravity. For this, the density of the solid particles must be greater than that of the liquid.
With HM 142, the factors influencing the separation process in sedimentation tanks can be investigated. First a suspension of water and whiting is prepared in a tank. A pump delivers the suspension to the sedimentation tank. In the inlet area of the sedimentation tank the suspension intermingles with fresh water. The mixture flows over an inlet weir. On their way through the sedimentation tank the solids sink to the bottom. The clarified water flows out by way of the weir at the tank outlet.
The solid concentrations at the tank inlet and outlet are determined by means of two Imhoff hoppers. The mass separated in the tank can be determined from the difference between them. The flow rates of the suspension and the fresh water are adjusted by valves and indicated by flow meters. This enables the mixing ratio - and thus the solid concentration of the mixture - to be adjusted. In order to ensure a uniform mix of the suspension and prevent premature sedimentation, a portion of the suspension is fed back into the tank by way of a bypass. To investigate the flow conditions, ink can be added with a piston burette to the fresh water stream as a tracer substance. The mixed-in volume of ink is entered using keys and indicated on a display. To provide enhanced observation of the flow conditions and settling processes, the sedimentation tank is made of transparent material.
A baffle plate can be positioned in the tank to impede the flow. Its horizontal and vertical positioning in the tank is adjustable. This enables the flow conditions and the efficacy of the separation process to be influenced.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments
- Learning the fundamental principle of separation of solids from suspensions with sedimentation tanks
- Efficiency of the separation process dependent on
  + solid concentration of suspension
  + flow rate
  + position of baffle plate
- Investigation of flow conditions dependent on
  + flow rate
  + position of baffle plate

* Solid/liquid separation in a sedimentation tank1
* Visualisation of flow conditions
[1] Separation of suspensions by sedimentation in transparent sedimentation tank
[2] Tank with submersible pump to prepare and transport a suspension comprising water and whiting
[3] Bypass to tumble and homogenise the suspension
[4] Mixing of the suspension with fresh water in sedimentation tank inlet zone
[5] Adjustment of fresh water and suspension flow rate by valves
[6] Precise piston burette for metering of ink to visualise flow conditions in sedimentation tank
[7] Influencing of flow conditions in tank with positioned baffle plate
[8] Determination of solid concentrations at tank inlet and outlet by Imhoff hoppers

Technical Data
Sedimentation tank
- dimensions: l x w x h: 1000x400x230mm
- capacity: approx. 80L
- material: colourless PMMA
Suspension tank
- capacity: approx. 100L
- material: stainless steel
- max. flow rate: 78L/min
- max. head: 5m
Piston burette
- metering accuracy: 0.15% of nominal volume
- volume adjustment range: 0.00...20.00ml
- resolution: 0.01ml
Imhoff hoppers
- capacity: 1000ml
Flow rate measuring ranges
- fresh water: 150...1600L/h
- suspension: 0...1.9L/min

Dimensions and Weight
l x w x h : 1900 x 670 x 1900 mm
Weight : approx. 145 kg

230V, 50Hz, 1 phase or 120V, 60Hz, 1 phase
Water connection: 200...300L/h, drain

Scope of Delivery
1 trainer, 1 piston burette, 2 Imhoff hoppers, 1 packing unit of whiting, 1 set of instructional material

Order Details
070.14200  HM 142  Separation in Sedimentation Tanks
Alternative products
CE 115 -- Fundamentals of Sedimentation

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Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
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