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PRODUCT
CE 587 Dissolved Air Flotation
Education / GUNT Hamburg / Process Engineering / Water Treatment /
description

CE 587 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.
  From the flocculation tank the raw water enters the flotation tank. A part of the treated water is removed from the flotation tank and saturated with air under pressure. This water (recycle water) enters via a relief valve so that it suddenly expands to atmospheric pressure. This creates minute air bubbles which attach to the flocs. This makes the flocs rise to the surface of the water. Using a scraper the floating flocs (float) can be moved into a collection channel.
  Flow rates, pressures and pH values are masured. The pH value can additionally be controlled. The pressure of the recycle water can be adjusted.
  Trivalent metallic salts are usually well suited as coagulants. Common flocculants are organic polymers.    

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

 

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

[1] removal of solids from raw water using dissolved air flotation

[2] conditioning of the raw water by flocculation
[3] 3 Metering pumps for chemicals
[4] flocculation tank with 3 chambers and 4 stirring machines
[5] flotation tank with electrically driven scraper

[6] pressure tank and 2 circulation pumps
[7] relief valve

[8] separate supply unit with tank and pump for

raw water
[9] magneto-inductive flow rate sensor
[10] measurement of flow rate, pressure and pH value
[11] 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 (raw water): 0...550L/h
- flow rate (recycle water): 30...320L/h
- flow rate (air): 20...360L/h
- pH value: 1...14
- pressure (recycle water): 0...6bar

 

Dimensions and Weight

LxWxH: 1.550x790x1.150mm (supply unit)
LxWxH: 3.100x790x1.950mm (trainer)

Total weight: approx. 550kg

Required for Operation

230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Compressed air and water connection required

Drainage recommended

Scope of Delivery

1 supply unit

1 trainer

1 set of hoses

1 set of instructional material

Order Details
 083.58700  CE 587  Dissolved Air Flotation