What Is an Air Flotation Machine? The Complete Guide to Dissolved Air Flotation (DAF) Systems for Industrial Wastewater Treatment
Industrial wastewater often contains suspended solids, oils, grease, fibers, and colloidal particles that are difficult to remove through conventional sedimentation. An Air Flotation Machine, commonly known as a Dissolved Air Flotation (DAF) system, is one of the most efficient technologies for separating these contaminants before biological or advanced treatment.
At HONCO, we design and manufacture high-performance air flotation machines that provide reliable solid-liquid separation for a wide range of industrial applications. With compact construction, low operating costs, and high treatment efficiency, our DAF systems help customers meet strict environmental discharge standards while reducing maintenance and operating expenses.
What Is an Air Flotation Machine?
An Air Flotation Machine is a wastewater treatment device that removes suspended solids, oils, grease, and fine particles by using millions of microscopic air bubbles.
The process works by dissolving compressed air into recycled water under pressure. When the pressure is released, microbubbles measuring approximately 20–40 microns are generated. These bubbles attach themselves to contaminants, reducing their density and allowing them to float to the water surface. A skimming system continuously removes the floating sludge, while clarified water exits from the bottom of the tank.
Compared with gravity sedimentation, DAF technology offers significantly faster separation and higher removal efficiency, especially for lightweight particles and emulsified oils.
How Does a Dissolved Air Flotation (DAF) System Work?
A complete DAF system generally consists of:
Air dissolving system
Recycle water pump
Pressure vessel
Bubble release device
Flotation tank
Sludge skimmer
Sludge discharge system
Control cabinet
Operating Process
Step 1. Wastewater enters the reaction zone.
Step 2. Coagulants and flocculants are added when necessary.
Step 3. Pressurized recycle water generates microbubbles.
Step 4. Microbubbles attach to suspended particles.
Step 5. Pollutants float to the water surface.
Step 6. A scraper removes floating sludge.
Step 7. Clean water flows to the next treatment stage.
This continuous operation ensures stable performance even under fluctuating wastewater conditions.
Main Advantages of HONCO Air Flotation Machines
High Removal Efficiency
The system effectively removes:
Suspended Solids (SS)
Oil and Grease (FOG)
Emulsified Oil
Algae
Fibers
Organic Suspended Matter
Typical removal performance includes:
SS Removal: up to 95%
Oil Removal: up to 95%
COD Reduction: 50–70%
Color Reduction: approximately 90% depending on wastewater characteristics.
Compact Footprint
Compared with traditional sedimentation tanks, DAF systems require much less installation space, making them ideal for factories with limited land availability.
Low Energy Consumption
HONCO utilizes efficient dissolved air technology and optimized hydraulic design to reduce energy usage while maintaining excellent separation performance.
Easy Operation
The equipment features PLC automatic control, stable operation, and minimal operator intervention.
Flexible Customization
Every wastewater project is different.
HONCO offers customized solutions based on:
Flow rate
Water quality
Available installation space
Industry requirements
Local discharge standards
Typical Industrial Applications
Our Air Flotation Machines are widely used in:
Food Processing
Removes grease, proteins, starch, and suspended solids from food wastewater.
Slaughterhouses
Efficiently separates animal fats and organic solids before biological treatment.
Textile & Dyeing
Reduces color, suspended solids, and organic pollutants.
Paper Mills
Recovers valuable fibers while reducing wastewater pollution.
Petrochemical Industry
Separates emulsified oil and floating hydrocarbons.
Electroplating
Removes suspended heavy metal flocs after chemical precipitation.
Municipal Wastewater
Used as a pretreatment process to reduce the load on downstream biological treatment.
Why Choose HONCO Air Flotation Machines?
HONCO has years of experience in manufacturing industrial water and wastewater treatment equipment.
Our advantages include:
Factory Direct Supply
Custom Engineering Solutions
High-Quality Anti-Corrosion Materials
Stable Dissolved Air Technology
Fast Delivery
Professional Technical Support
Worldwide Export Experience
Every machine undergoes strict quality inspection before shipment to ensure reliable long-term performance.
Frequently Asked Questions
What industries are suitable for DAF systems?
DAF systems are widely used in food processing, paper manufacturing, textile dyeing, oil refining, electroplating, chemical plants, slaughterhouses, and municipal wastewater treatment.
Can the machine remove oil from wastewater?
Yes. Air flotation technology is particularly effective for separating free oil, emulsified oil, grease, and other floating contaminants.
Is chemical dosing always required?
Not always. Depending on wastewater characteristics, coagulants and flocculants may be added to improve separation efficiency.
Can the system be customized?
Absolutely. HONCO designs customized air flotation machines according to treatment capacity, wastewater quality, installation conditions, and customer requirements.
Conclusion
As environmental regulations become increasingly stringent, efficient pretreatment technologies have become essential for industrial wastewater management. Dissolved Air Flotation (DAF) systems provide a reliable, energy-efficient, and cost-effective solution for removing suspended solids, oils, and organic contaminants before further treatment.
HONCO Air Flotation Machines combine advanced dissolved air technology with durable engineering to deliver outstanding separation performance across a wide range of industries. Whether you need a compact unit for a small factory or a high-capacity system for large-scale industrial wastewater treatment, our engineering team can provide a customized solution that meets your operational needs.
