Name: Dissolved Air Flotation System
Brand: JX Filtration

Description

JX Filtration offers a full range of dissolved air flotation systems from compact units handling 5 m³/h to high-capacity industrial models exceeding 200 m³/h, with flexible customization options to suit various wastewater types and treatment objectives across municipal, industrial, and food processing applications—high-efficiency, space-saving, and built for continuous operation.

A dissolved air flotation system, also known as a DAF unit or air flotation machine, is a solid-liquid separation device that introduces microbubbles into wastewater to float suspended solids, oils, and colloidal substances to the surface for removal. It is widely used as a primary clarification stage in wastewater treatment, effectively removing contaminants that are difficult to settle by gravity.

Working Principle

The DAF system operates through a continuous cycle of air dissolution, microbubble release, and scum removal:

Air Dissolution Stage: A portion of clarified effluent is recycled and pressurized by a pump, then mixed with compressed air in a saturation tank. Under elevated pressure (typically 0.3–0.5 MPa), air dissolves into the water at a concentration far exceeding normal atmospheric saturation. Dissolved air efficiency exceeds 90%.
Microbubble Release Stage: The air-saturated recycle stream is introduced into the flotation tank through a release device. The sudden pressure drop causes dissolved air to come out of solution, forming microscopic bubbles typically 20–40 μm in diameter. These microbubbles attach to suspended particles and oil droplets, reducing their apparent density below that of water.
Separation & Skimming Stage: The bubble-particle aggregates rise to the water surface, forming a scum layer. A surface scraper system continuously removes the scum into a sludge collection tank, while clarified water exits from the lower portion of the tank through an overflow trough. The system integrates coagulation, air flotation, skimming, sedimentation, and sludge scraping functions in a single compact unit.

Advantages

High separation efficiency – Effectively removes suspended solids, oils, grease, and colloidal particles, achieving effluent clarity up to 95%+ depending on feedwater quality
Compact integrated design – Combines flocculation, separation, and skimming zones in a small footprint, ideal for space-limited installations
Rapid startup and processing – High saturation efficiency and uniform microbubble distribution enable quick solid-liquid separation
Corrosion-resistant construction – Available in 304/316L stainless steel or carbon steel with anti-corrosion coating for long-term reliability
Automated operation – Fully integrated PLC control system with touchscreen HMI enables automatic dosing, air dissolving, sludge discharge, and fault alarms
Energy-efficient – Low power consumption with high-efficiency pumps and air dissolving systems reduces operational costs
Customizable for specific applications – Tailored to different industries and water types including oily wastewater, chemical treatment, and food processing
Reliable after-sales support – Backed by up to 5 years warranty and lifetime technical support