Dissolved Air Flotation
Overview
The Dissolved Air Flotation (DAF) system is an efficient solid-liquid separation technology designed to remove suspended solids (SS), oils, grease, and other floatable contaminants from industrial wastewater.
By releasing microscopic air bubbles into the wastewater, contaminants attach to the bubbles and float to the surface, where they are removed by a skimming mechanism. DAF systems are widely used as primary treatment, pretreatment, or polishing treatment in industrial wastewater facilities.
Typical Applications
- Food Processing Wastewater
- Slaughterhouse Wastewater
- Dairy Wastewater
- Brewery Wastewater
- Seafood Processing Wastewater
- Petrochemical Wastewater
- Textile Wastewater
- Paper Mill Wastewater
- Electroplating Wastewater
- Municipal Wastewater Pretreatment
Main Components
Air Dissolving System
Generates pressurized recycle water saturated with dissolved air.
Flotation Tank
Provides the environment for bubble-particle attachment and flotation.
Recycle Water System
Supplies dissolved air water to the flotation chamber.
Chemical Dosing System
Optional coagulation and flocculation units enhance contaminant removal efficiency.
Sludge Scraper System
Automatically removes floated sludge from the water surface.
Control System
PLC-based automatic control system available for efficient operation and monitoring.
Technical Specifications
| Item | Specification |
|---|---|
| Treatment Capacity | Customized |
| Process Type | Dissolved Air Flotation |
| SS Removal Efficiency | Up to 90–99% |
| Oil & Grease Removal | Up to 95% |
| Material Options | Carbon Steel / SS304 / SS316 |
| Installation Type | Skid Mounted / Civil Construction |
| Control Mode | Manual / PLC Automatic |
| Power Supply | Customized |
| Design Standard | Customized |
Working Principle
The Dissolved Air Flotation process operates by dissolving air into water under pressure and then releasing it into a flotation tank under atmospheric conditions.When the pressure is reduced, millions of microbubbles are generated. These bubbles attach to suspended particles, oils, and grease, reducing their density and causing them to float to the water surface.The accumulated sludge layer is continuously removed by a skimmer system, while clarified water is discharged from the bottom of the unit for further treatment or reuse.
Key Benefits
High Removal Efficiency
Effectively removes suspended solids, fats, oils, grease (FOG), and other contaminants, helping facilities achieve discharge or reuse requirements.
Compact Footprint
Compared with conventional clarification systems, DAF units require less installation space and offer higher treatment efficiency.
Fast Start-Up
The system can quickly reach stable operating conditions with minimal startup time.
Flexible Process Design
Suitable for a wide range of industrial wastewater characteristics and treatment objectives.
Low Operating Cost
Optimized air dissolution and sludge removal systems help reduce operational expenses.
Reliable Performance
Maintains stable treatment performance even under fluctuating hydraulic and pollutant loads.
Why Choose Our DAF System
- Customized engineering solutions
- High-quality equipment manufacturing
- Stable and reliable operation
- Low maintenance requirements
- Comprehensive technical support
- Installation and commissioning guidance
- Overseas project experience
Request a Solution
Send us the right side information:
Our engineering team will recommend the most suitable DAF solution for your project.
Wastewater flow rate
SS concentration
Oil and grease content
COD/BOD values
Discharge requirements