This unit has been designed to demonstrate the hydraulic characteristics and settling efficiencies of a model settling basin. Although scale-up to industrial size sedimentation tanks is difficult, relevant deductions can be made as to how non-uniform flows occur and how these interact with the settling characteristics of particular suspensions.
Description
Water is taken from the laboratory mains supply and is fed to the settling tank via a flow meter. For studies of sedimentation, slurry is prepared in a sump tank and pumped via a specially designed flow meter to join the fresh water stream just before entry to the settling tank. Well-mixed slurry of known concentration and flow enters the tank uniformly under an inlet weir. This may be comparatively analyzed by drying and weighing. The sump tank is continually agitated by a flow sparge device to prevent settling of solids during an experiment. For hydraulic tracer and visualisation studies, an accurate dye injection system is provided. A known volume of dye solution is injected just before the entry to the settling tank.
DEMONSTRATION CAPABILITIES
Measuring flow short-circuiting and dead space using a tracer
Comparison of real flow regimes with idealized flow models (fig. 1)
Effect of flow rate and baffle position on dispersion
Measuring sediment removal efficiencies and relating these to the hydraulic characteristics.
Utilities Required
Electrical supply: 220-240V/1ph/50Hz
Water supply: 5 litres/min @ 1 bar
TECHNICAL DETAILS
Product & Code
Model Sedimentation Tank & WT 06
Settling tank
1000 x 400 x 200mm
Sediment sump
tank capacity: 120 litres
Water flow meter
range: 0.5-5 l/min
Sediment suspension
flow meter range: 0-2 l/min
Pump flow rate:
25 l/min at 5m head
Motor:
0.1kW
Overall dimensions (Approx)
Height: 1.55m
Width: 1.90m
Depth: 0.60m
Weight and Volume (Approx)
Volume: 2.9m3
Gross weight: 310kg
ACCESSORIES
Sedimentation Studies Apparatus (W2) to characterize settling regimes of selected suspension
