What Is DAF Oil Removal Machine? Principle, Function & Industrial Application

Gravitational sedimentation struggles to remove tiny emulsified oil droplets and fine suspended solids in industrial oily wastewater, which often leads to substandard discharge and low resource utilization. As a classic and reliable physical water treatment device, Brator Dissolved Air Flotation (DAF) Oil Removal Machine solves the industry pain point of difficult fine oil separation, providing stable, efficient and chemical-free purification for various complex oily wastewater scenarios.

Working Principle of DAF Oil Removal Machine

Different from traditional oil-water separation equipment that only relies on gravity, the DAF system adopts micro-bubble flotation physical separation technology. The core working process is divided into two key steps: high-pressure air dissolution and pressure-release micro-bubble generation.

First, air is fully dissolved in circulating water under 0.3–0.5 MPa high pressure to form saturated dissolved-air water. Then, the saturated water is instantly depressurized through a precision release device, generating a large number of uniform micro-bubbles with a particle size of 20–100 μm. These tiny bubbles have a huge specific surface area and can quickly adhere to emulsified oil droplets, free oil particles and colloidal suspended solids in the wastewater, forming low-density oil-gas flocs.

Driven by buoyancy, the flocs float rapidly to the liquid surface, and the automatic skimming system regularly removes oil sludge to complete solid-oil-water three-phase separation. The whole treatment process requires no demulsifiers or flocculants, completely avoiding secondary pollution caused by chemical dosing.

Core Performance and Functional Advantages

Stable and Efficient Purification Capacity

The DAF oil removal machine achieves excellent treatment effect for conventional industrial oily wastewater. For influent water with oil content up to 200 mg/L, the effluent oil content can be stably controlled below 20 mg/L, and the suspended solids removal rate exceeds 90%, fully meeting industrial discharge and water reuse standards.

Highly Integrated and Intelligent Operation

Brator DAF oil separator adopts an all-in-one integrated design, integrating flotation tank, dissolved air system, precision release device, circulating pipeline, automatic skimming mechanism and PLC control cabinet. It supports one-touch startup and fully automatic unattended operation, with built-in liquid level monitoring, fault alarm and remote data transmission functions. The equipment has strong anti-shock load capacity and can adapt to frequent fluctuations in water quality and flow rate.

Flexible Specifications and Durable Structure

The treatment capacity covers 1–200 m³/h, supporting customized skid-mounted and large-scale industrial configurations. The main body is optional with anti-corrosion carbon steel, 304 stainless steel and 316L stainless steel, adapting to corrosive working environments. Chain drive and traveling bridge skimming structures are optional to ensure long-term stable operation and low maintenance cost.

Wide Industrial Application Scenarios

Thanks to its strong adaptability and stable purification performance, the DAF oil removal machine is widely used in multiple industries: oilfield produced water, refinery oily wastewater, tank bottom drainage, metalworking cutting fluid wastewater, food processing and slaughterhouse wastewater, catering grease wastewater, ship bilge water, electroplating and coal chemical wastewater. It can be used as both pretreatment equipment to reduce subsequent treatment load and advanced purification equipment to guarantee final water quality.

Conclusion

DAF dissolved air flotation equipment is an indispensable core device in the field of oily wastewater treatment. With pure physical separation, high efficiency, intelligence and low pollution advantages, Brator DAF oil removal machine effectively solves the problem of difficult removal of emulsified oil and fine suspended solids, helping industrial enterprises achieve green environmental protection compliance and efficient water resource recycling.