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| Item: |
298-00 |
| Description: |
Diffused
Air - Dissolved Air Flotation Test Apparatus (DADAFTA), 115 Volt
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Flotation is a unit operation used to separate solids or liquid particles from a liquid phase. Separation is brought about by the introduction of fine gas (usually air) bubbles into the liquid phase. The bubbles attach to the particulate
matter, and the buoyant force of the combined particle and gas bubbles is great enough to cause the particle to rise to the surface.
Air bubbles are added or caused to form by one of the following methods:
1. Diffused Air Flotation - Aeration produced by passing air through a porous media.
2. Dissolved Air Flotation - Injection of air while the liquid is under pressure, followed by the release of the pressure.
In water/wastewater treatment, flotation is mainly used to remove suspended matter and to concentrate biological sludges. The principal advantage of flotation over sedimentation is that very small or light particles that settle slowly can be removed more completely and in a shorter time.
Applications of the Diffused Air - Dissolved Air Flotation apparatus in the field of water/wastewater treatment include:
1. Separation of flocculated matter in the clarification of surface water.
2. Separation of flocculated or non-flocculated oil in wastewater from refineries, airports, and steelworks.
3. Separation of metallic hydroxides or pigments in the treatment.
4. Thickening of the activated sludge (or mixed sludge and primary sludge) from organic wastewater treatment plants.
Chemical flotation aids are often used to enhance the Diffused Air - Dissolved Air Flotation (DADAFTA) process. The most effective chemicals used are moderate weight polyamines or very high molecular weight cationic polyacrylamide polymers. Polymers can increase solid recovery in the
floated sludge from 85% to 98% and can also reduce the suspended solids in the subnatant.
The OFITE DADAFTA allows the user to simulate a flotation process on a small scale. The DADAFTA can be used to measure the floatability of a particular sludge in designing treatment plants and to evaluate chemical flotation aids.
A few of the DADAFTA features include:
• Clear, unibody pressure cell withstands pressures up to 125 psi (8.6 bar).
• Oil-less 115-volt piston air compressor for high efficiency and constant performance.
• Permeable ceramic disk used for the diffuser can be removed, cleaned, and reused.
• Chemical flotation aid inlet with septum.
• Stainless steel paddle for additional mixing capabilities.
• Easy-to-read flow meter and pressure gauge.
• Quick disconnect fittings.
Components:
#141-22 Felt Filter
#143-01-1 Gauge, 200 psi, 1/8" Back Connection
#153-09-2 Graduated Cylinder, 1000 ml, PMP Nalgene
#171-90-04 1/4" NPT Cross, 316 S.S.
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