Description
What Is DAF Dissolved air flotation
Introduction to Dissolved air flotation (DAF)
Dissolved air flotation (DAF) is a proven and highly effective water and wastewater treatment process used to clarify waters by removing suspended solids, oils, greases, and other low-density contaminants. The key mechanism involves dissolving air in water under pressure and then releasing the pressure at the atmospheric level in the flotation tank. This rapid pressure release creates billions of microscopic air bubbles (typically 10−100 μm in diameter) that attach to or become trapped within the suspended particles, increasing their buoyancy and causing them to float to the surface, where they are skimmed off as sludge.
Selecting the appropriate DAF system is a critical engineering decision that significantly impacts the overall treatment plant efficiency, operational costs, and compliance with discharge regulations. A "high-efficiency" DAF system is one that achieves superior clarification (>90% removal efficiency for TSS and FOG), minimizes chemical consumption, requires less energy, and maintains stable performance under variable hydraulic and contaminant loading conditions.
Why Choose DAF Dissolved Air Flotation
- Total suspended solids (TSS) reduced by up to 97.
- Chemical oxygen demand (COD) removal rate of up to 60-80%.
- Integrated sludge hopper for easy removal of solid deposits .
- The DAF area provides a static space for the formation of the float.
- Heavy-duty, fully protected, counter-current surface separator that removes surface float.
DAF Dissolved Air Flotation Process
DAGYEE DAF Dissolved Air Flotation Advantage
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The most effective white water / recycling design. Large effective settling area.
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With optional chemical processing stage improved separation efficiency.
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Compact clarifier and reaction cell design surface loading up to 15m3/m2hr.
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Rugged design for easy understanding, operation and maintenance.
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Carbon steel and stainless steel body material design, the lowest cost of ownership.
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DAF Model |
Qmax. (m3/h) |
PhysicalDimensions(m) |
Weight (Kg) |
Operating Weight(kg) |
Power(kw) | ||||
|
L/L1 |
W/W1 |
H/H1 |
Refluxpump Kw |
Air compressor kw |
Skimmer |
||||
| DAF-002 | 2 | 3.4/2.5 | 2.4/1.16 | 2.2/1.7 | 1300 | 4000 | 0.75 | 0.55 | 0.2 |
| DAF-003 | 3 | 3.7/2.8 | 2.4/1.16 | 2.2/1.7 | 1500 | 5000 | 0.75 | 0.55 | 0.2 |
| DAF-005 | 5 | 4/3 | 2.4/1.16 | 2.2/1.7 | 1600 | 7000 | 1.1 | 0.55 | 0.2 |
| DAF-010 | 10 | 4.65/3.8 | 2.7/1.36 | 2.4/1.9 | 2000 | 12000 | 1.5 | 0.55 | 0.2 |
| DAF-015 | 15 | 5.6/4.5 | 2.9/1.66 | 2.5/2 | 2200 | 18000 | 2.2 | 0.75 | 0.2 |
| DAF-020 | 20 | 5.9/4.8 | 3.2/1.96 | 2.5/2 | 3000 | 22000 | 3 | 0.75 | 0.2 |
| DAF-030 | 30 | 6.8/5.5 | 3.2/2.16 | 2.7/2.2 | 3800 | 32000 | 3 | 0.75 | 0.4 |
| DAF-040 | 40 | 8/6.7 | 3.6/2.6 | 2.7/2.2 | 5000 | 45000 | 5.5 | 0.75 | 0.4 |
| DAF-050 | 50 | 8.4/7 | 3.6/2.6 | 2.7/2.2 | 5500 | 55000 | 7.5 | 0.75 | 0.4 |
| DAF-060 | 60 | 9.9/8.4 | 3.8/2.8 | 2.9/2.4 | 6000 | 66000 | 7.5 | 1.5 | 0.4 |
| DAF-070 | 70 | 10.4/9 | 3.8/2.8 | 2.9/2.4 | 6500 | 75000 | 11 | 1.5 | 0.4 |
| DAF-080 | 80 | 10.8/9.4 | 4/3 | 2.9/2.4 | 7500 | 100000 | 11 | 1.5 | 0.4 |
| DAF-100 | 100 | 12.1/10.6 | 4.2/3.2 | 2.9/2.4 | 9000 | 110000 | 15 | 1.5 | 0.4 |
| DAF-120 | 120 | 12.5/11.4 | 4.4/3.4 | 2.9/2.4 | 10000 | 130000 | 15 | 1.5 | 0.4 |
DAF Dissolved Air Flotation Application
| Slaughterhouses |
| Meat processing and pack- ing |
| Fish processing Dairies |
| Convenience food production |
| Margarine production Oil and fat refineries Canneries |
| Industrial kitchens and can- teens |
| Fast food providers Soap works Cosmetics industry Textile industry Chemical industry |
| Petrochemical industry Iron and steel industry Metal processing Galvanizing, electroplating Land remediation |
Conclusion and Summary of Selection Criteria
Choosing a high-efficiency DAF system involves a holistic review that extends beyond simple flow capacity. The optimal system is a balance between hydraulic sizing, optimal chemical pre-treatment, advanced bubble generation, and low operational cost.
By meticulously evaluating these four core dimensions, a robust, energy-efficient, and high-performing DAF system can be selected, ensuring long-term environmental compliance and cost-effective operation.
Supplier Information
We are a professional supplier specializing in high-efficiency Dissolved Air Flotation (DAF) systems, offering customized engineering solutions, bench-scale testing services, and robust equipment designed for demanding industrial and municipal applications.
Contact Us for a Consultation:
Selection Dimension
Key Criterion for High Efficiency
I. Water Characterization
Thorough pre-treatment and A/S ratio optimization based on testing.
II. Hydraulic/Mechanical
Low Hydraulic Surface Loading Rate (HSR); High-quality, fine bubble generation.
HSR at lower end of range; Saturation Pressure ≥ 5 bar; VFD on Recycle Pump; Proprietary Air Release Nozzles.
III. Operations/TCO
Automation for chemical and flow control; Energy-efficient components; Durable materials.
IV. Vendor Support
Proven track record in your specific industry; Strong performance guarantee.
Industry-Specific References; Guaranteed Effluent TSS/FOG Limits.
