DAF Dissolved Air Flotation Unit
Product Overview
The DAF (Dissolved Air Flotation) unit removes fats, oils, grease and suspended solids using fine air bubbles. It is widely used as pre-treatment for industrial and food-industry wastewater.
Working Principle
Air is dissolved into water under pressure and released into the flotation cell, forming micro-bubbles that attach to particles and float them to the surface for skimming, while clarified water is drawn from below.
Key Features
- Effective FOG and suspended-solids removal
- Compact, high-rate separation
- Often combined with coagulation and flocculation
Advantages
- Protects downstream biological stages
- Reduces organic and solids load
- Continuous operation
Applications
Technical Specifications
Indicative typical ranges to guide planning. Exact parameters are engineered and confirmed for each project based on your flow rate, influent quality and target discharge standard.
| Parameter | Specification |
|---|---|
| Treatment capacity (m³/day) | 120 – 12,000 m³/day (5 – 500 m³/h) |
| Influent quality (BOD / COD / SS) | TSS up to 2,000–10,000 mg/L; high FOG / oil |
| Target effluent standard | TSS removal 90–98%; FOG removal 90–99% |
| Process type | Coagulation / flocculation + dissolved-air flotation |
| Footprint / installation | Compact skid; surface load 5–12 m³/m²·h |
| Power supply | Recycle pump + air saturation at 4–6 bar |
| Material of construction | SS304 / 316 or carbon steel (epoxy) |
| Operation mode | Continuous; primary / pre-treatment, 10–30% recycle |
Process Flow
- Coagulation and flocculation
- Air saturation
- Flotation cell
- Float skimming
- Clarified water out
- Sludge handling
Frequently Asked Questions
Where is DAF used?
Most often as pre-treatment to remove fats, oils, grease and solids before biological treatment.
Does DAF use chemicals?
Usually coagulant and flocculant dosing improves performance, depending on the wastewater.
Is DAF continuous?
Yes, DAF units operate continuously with automatic float skimming.
Quality & Assurance
Every Hydrex Eco system is built to order and function-tested before shipment.
ISO 9001Quality Management
CE MarkingEU Conformity
SGS VerifiedIndependent InspectionRequest a Quote
Tell us your flow rate, wastewater source and target standard and our engineers will respond with a tailored proposal.