Vortex Dissolved Air Flotation (vDAF)


What is vDAF

vDAF (Vortex Dissolved Air Flotation) is a solids flotation technology which uses extremely fine (25~30µm) bubbles, generated by a combined Vortex Generator and Impact Nozzle. By eliminating saturation tanks and  separating pumping from gas enrichment, this system achieves higher gas:liquid ratios and a higher density bubble bed. As a result, the vDAF can achieve equivalent solids removal at <25% energy draw and a smaller footprint than competitors. Replace induced-air pumps or saturation tanks in new installs to achieve dramatically smaller footprints and energy bills, or retrofit existing DAF systems to boost the treatment capacity of your existing system by up to 60%!

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vDAF Benefits

The vDAF can achieve equivalent solids removal at <25% energy draw and <30% a smaller footprint.

  • High floatation speed and flotation efficiency

  • Variable bubble concentration and the size per different loading situation

  • Wide range of treatment loading concentration

  • Consistent treatment efficiency and stable operation

  • Energy saving and smaller foot-print

What is Vortex Generator?

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The Vortex Generator is a patented gas-liquid blending technology that enriches the DAF recycle stream with more air than conventional mixing systems. Since enrichment takes place instantly and independently of pumps and tanks, the Vortex Generator can enrich your DAF process with ozone for simultaneous oxidation and color removal, or CO2 for low-cost pH adjustment. Turn your DAF into a multitasking treatment system with our vortex generator system!

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Micro-Bubble Production Process

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vDAF-03 (Vortex DAF Ozone)

vDAF-O3 (Vortex DAF-Ozone) is a system that combines vDAF, Ozone and UV. vDAF-O3 was uniquely developed to target Non-Biodegradable COD in industrial wastewater treatment. Combine solids removal and AOP in one streamlined process!


Comparison with other DAF system

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Conventional DAF

Vortex DAF

*Based on performance comparison of VAF-250 model

Parameter Other DAFs Induced Air Flotation vDAF
Bubble Size (μm) 200~300 30~50 25~30
Bubble per mL 10,000~20,000 10,000~20,000 ~100,000
Pressure (kPa) 500~900 300~400 350~400
Recirculation Rate(%) 80~120 15~30 15~30
Air Dissolution Rate (%) ~80 ~90 90+
Energy Consumption (kWh/d)* 545.6 264.0 108.0

vDAF & COWT for Livestock Wastewater Treatment

For conducting phosphorus removal (algal bloom control) from raw livestock wastewater and anaerobic digester effluent, vDAF, FMX, and COWT are used in combination. Solids control is key for phosphorus removal from livestock wastewater, and these methods together allow for the removal of all levels of solids (from low to high solid concentration). The combination of these three technologies exhibit a unique synergy, with the vDAF concentrated on large part removal while FMX is concentrated on small part removal.

Vortex Generator (vGen) Models & Specifications

Model Water Flow Rate (GPM) Air Flow Rate (GPM) Power Requirement(kW)
(Motor+Air Compressor)
vGen-80 21 3.2 2.45
vGen-125 33 5.0 3.7
vGen-250 66 10 5.5
vGen-500 132 20 9.7
vGen-1000 264 40 18.7

vDAF Technology

Reference Sites


Shale Gas Production Waste Treatment - Produced Water Reuse
Texas, U.S.A

Item Turbidity (NTU)
Produced Water 37.8
Electrolytic 175.0
Chemical 3.9
Final Effluent 3.3
Removal rate 91.2%


Choonchun Municipal Wastewater Treatment Plant - Backwash Water Treatment
South Korea

Item SS (mg/L)
Influent 530
Effluent 60
Sludge 27,600
Removal rate 88.7%


Dangjin Livestock Wastewater Treatment Center
South Korea

Item CODmn SCODcr SS
Influent (mg/L) 754 1,037 1,160
Effluent (mg/L) 72 227 4.4
Removal rate 90.5% 78.1% 99.6%


Boeun Livestock Wastewater Treatment Center
South Korea

Item CODmn SCODcr SS
Influent (mg/L) 797 1,321 350
Effluent (mg/L) 65 152 2.0
Removal rate 88.1% 88.5% 99.4%


Sejong Livestock Wastewater Treatment Center
South Korea

Item CODmn SCODcr SS
Influent (mg/L) N/A N/A 48,400
Effluent (mg/L) N/A N/A 22,450
Sludge (mg/L) N/A N/A 43,850
Removal rate N/A N/A 53.6%


Kimhae Rendering Wastewater Treatment Plant
South Korea

Influent (mg/L) 2,230 2,700 2,700
Effluent (mg/L) 1,200 1,700 265
Removal rate 46.2% 37.0% 90.2%

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