Dissolved Air Flotation
Categories: Engineering Lab EquipmentIt demonstrates the clarification of raw water containing solids using the dissolved air flotation process.First, a suspension (raw water) is prepared in a tank. From here the raw water flows into a f...
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Description
It demonstrates the clarification of raw water containing solids using the dissolved air flotation process.
First, a suspension (raw water) is prepared in a tank. From here the raw water flows into a flocculation tank divided into three chambers. By adding a coagulant in the first chamber the repulsive forces between the solid particles are cancelled out. The solid particles combine into flocs. To create larger flocs a flocculant is added in the second chamber. The coagulant causes a drop of the pH value. By adding caustic soda the pH value of the water can be increased again. In the following third chamber of the flocculation tank low flow velocities are present to prevent any turbulence. Turbulence would impede the formation of flocs.
Learning Objectives/Experiments
Functional principle of dissolved air flotation
Creation of a stable operating state
Effects of various parameters
Coagulant concentration
Flocculant concentration
Determination of the hydraulic loading rate (rising velocity)
Specification
Removal of solids from raw water using dissolved air flotation
Conditioning of the raw water by flocculation
3 Metering pumps for chemicals
Flocculation tank with 3 chambers and 4 stirring machines
Flotation tank with electrically driven scraper
Pressure tank and 2 circulation pumps
Relief valve
Separate supply unit with tank and pump for raw water
Electromagnetic flow rate sensor
Measurement of flow rate, pressure and pH value
Control of the pH value
Technical data
Tanks
flotation tank: 150L
flocculation tank: 45L
raw water: 300L
treated water: 80L
sludge (float): 15L
Raw water pump
max. flow rate: 135L/min
max. head: 7,0m
Circulation pumps
max. flow rate: each 18L/min
max. head: each 50m
Metering pumps
max. flow rate: each 2,1L/h
Stirring machines
max speed: each 600min-1
Measuring ranges
flow rate: 0…550L/h (raw water)
flow rate: 30…320L/h (recycle water)
flow rate: 20…360L/h (air)
pH value: 1…14
pressure: 0…6bar (recycle water)
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
quick overview :
It demonstrates the clarification of raw water containing solids using the dissolved air flotation process.
First, a suspension (raw water) is prepared in a tank. From here the raw water flows into a flocculation tank divided into three chambers. By adding a coagulant in the first chamber the repulsive forces between the solid particles are cancelled out. The solid particles combine into flocs. To create larger flocs a flocculant is added in the second chamber. The coagulant causes a drop of the pH value. By adding caustic soda the pH value of the water can be increased again. In the following third chamber of the flocculation tank low flow velocities are present to prevent any turbulence. Turbulence would impede the formation of flocs.
Learning Objectives/Experiments
Functional principle of dissolved air flotation
Creation of a stable operating state
Effects of various parameters
Coagulant concentration
Flocculant concentration
Determination of the hydraulic loading rate (rising velocity)
Specification
Removal of solids from raw water using dissolved air flotation
Conditioning of the raw water by flocculation
3 Metering pumps for chemicals
Flocculation tank with 3 chambers and 4 stirring machines
Flotation tank with electrically driven scraper
Pressure tank and 2 circulation pumps
Relief valve
Separate supply unit with tank and pump for raw water
Electromagnetic flow rate sensor
Measurement of flow rate, pressure and pH value
Control of the pH value
Technical data
Tanks
flotation tank: 150L
flocculation tank: 45L
raw water: 300L
treated water: 80L
sludge (float): 15L
Raw water pump
max. flow rate: 135L/min
max. head: 7,0m
Circulation pumps
max. flow rate: each 18L/min
max. head: each 50m
Metering pumps
max. flow rate: each 2,1L/h
Stirring machines
max speed: each 600min-1
Measuring ranges
flow rate: 0…550L/h (raw water)
flow rate: 30…320L/h (recycle water)
flow rate: 20…360L/h (air)
pH value: 1…14
pressure: 0…6bar (recycle water)
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
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