DAF Pumps - Innovative Pump Technology for Dissolved Air Flotation

Nov 4, 2026

Uploaded by Damian

DAF Pumps EDUR deliver dissolved air flotation for separating suspended solids and emulsified oils from industrial wastewater. The EDUR pump generates sufficient microbubble air without extra air tanks, controls, or compressed air. Bubble attachment to suspended particles creates buoyant clusters that rise and are skimmed from the surface. Recycled air-enriched effluent is produced via supersaturation and controlled with simple valves. Up to 35% air at 100% saturation is achievable with microbubbles smaller than 30 micron.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

Application

How it works

Design Features

Long service life and steady characteristics

Impeller and hydraulic design

Built-in Economics and Efficiencies

Typical system examples

Performance Specifications and Features

Pump models and flow/pressure

Materials of construction and sealing

Pump Dimensions

Sectional Drawings and Spare Parts Listings

DAF Pumps INNOVATIVE PUMP TECHNOLOGY FOR DISSOLVED AIR FLOTATION AVAILABLE IN ALL-STAINLESS STEEL The EDUR pump, alone, produces the sufficient amount of air bubbles. No additional air tanks, controls, or compressed air is required. The following materials are available for construction of the EDUR DAF Pumps in the case of the following pH levels for the wastewater stream that you will be pumping: pH value less than 3 Stainless Steel pH value 3 to 5.9 Bronze pH value 6 to 10 Gray Cast Iron pH value 11 to 14 Gray Cast Iron (all iron) Application The EDUR dissolved air flotation (DAF) pump is a very effective way to separate suspended solids and emulsified oils from industrial waste streams. Microscopic air bubbles are produced and mixed with waste water containing the suspended contaminates. The small bubbles attach themselves to the suspended particles, which gives them a net positive buoyancy. These buoyant clusters of particles and bubbles rise smoothly to the surface forming a float which is removed by skimming. Air and recycled “clean” effluent is introduced to the pump suction. The proportion of air/water is controlled through simple valves. Under pump discharge pressure this air effluent mixture becomes supersaturated with air microbubbles. This enriched stream is then recycled back into the dirty effluent and fed to the DAF unit. Up to 35% air can be achieved with 100% saturation and microbubble size smaller than 30 micron. Design Features For DAF applications, as specified above, EDUR pumps meet the following requirements: • Long service life because of low wear caused by the inevitable contamination of liquids with solid particles. Proper selection of materials of construction is critical. • Steady pumping characteristics even with changing points of operation. • Sufficient blending of effluent and air to obtain maximum entrainment of air microbubbles @ 30 micron size. Normal standard pumps are not able to meet these requirements. The hydraulic parts of EDUR pumps have been specially designed to cope with problems which arise when pumping effluent/air mixtures. The distinctive feature of the EDUR pump is the impeller, open on both sides, and the innovative hydraulic design of the impeller blades. Design Features and Specifications Built-in Economics and Efficiencies A DAF system with use of the EDUR DAF Pump providing air enriched recycle effluent. A typical 100 GPM EDUR Recycle Pump provides 12% air with 93% saturation. Total Power: 10 HP. A typical DAF system avaiable now. Note the required air tank and controls for providing air entrainment. This is all eliminated with the use of the EDUR DAF Pump. Typical unit: 100 GPM recycle, 9% air at 80% entrainment. Total Power: 13 HP. (And you need 80 psi compressed air!) Performance Specificationsand Features PUMP MODEL EBX3U LBUX403C120L LBUX602C160L LBUX602E162L PERFORMANCE Flow 10 GPM 50 GPM 100 GPM 220 GPM Pressure 100 PSI 100 PSI 100 PSI 100 PSI Air Entrainment 12% 12% 12% 12% Bubble Size 30 Micron 30 Micron 30 Micron 30 Micron MOTOR Power Absorbed 2.3 Bhp 6.2 Bhp 12.8 Bhp 24.6 Bhp Motor Power 3 Hp 10 Hp 20 Hp 30 Hp Motor Speed 3500 RPM 3500 RPM 3500 RPM 3500 RPM Motor Design NEMA C-Face TEFC/230V TEFC/460V TEFC/460V TEFC/460V MATERIALS OF CONSTRUCTION Casing Nodular Cl Nodular Cl or 316 SS Nodular Cl or 316 SS Nodular Cl 316 SS Impellers Bronze or 316 SS 316 SS 316 SS 316 SS Shaft 316 SS 316 SS 316 SS 316 SS Mechanical Seal SiC/SiC SiC/SiC SiC/SiC SiC/SiC FLANGES - NPT THREADED OR WELD-NECK Suction 1⁄14"/Top 2⁄12"/End 3"/End 3"/End Discharge 1⁄14"/Top 1⁄12"/Top 2⁄12"/Top 2⁄12"/Top Ratings: Suction/Discharge 150\#/150\# RF 150\#/150\# RF 150\#/150\# RF 150\#/150\# RF Note: All pumps can be supplied with companion flanges as an option. Companion flanges set includes: companion flanges, nuts, bolts and flange gaskets. Pump flanges manufactured to DIN standards. Companion flanges

FAQs

What makes the EDUR DAF pump different from standard pumps?

It produces the needed air bubbles directly, eliminating additional air tanks, controls, and compressed air. Its impeller and innovative hydraulic blade design are tailored to handle effluent/air mixtures for DAF duty.

How does the dissolved air flotation separation process work in this system?

Recycled air-enriched effluent is formed by supersaturation and returned to the dirty effluent. Microbubbles attach to suspended particles, creating buoyant clusters that rise to the surface and are removed by skimming.

How is air entrainment controlled and what microbubble size is referenced?

Air/water proportion is controlled through simple valves. The document states that microbubble size is smaller than 30 micron at up to 35% air with 100% saturation.

Nov 4, 2026

Uploaded by Damian