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Dissolved Air Flotation (DAF) Systems

High-Efficiency Dissolved Air Flotation Manufacturer
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  • video Dissolved Air Flotation
    Dissolved Air Flotation
    Dissolved air flotation is a solid-liquid separator that many bubbles in contact with the solids, making their density lower than the water, and then they will float up to the surface so that suspended solids of water, including oil&grease without dissolving in water, can be reduced. DAF can be used in pretreatment, water reuse, deep treatment, phosphorus removal from tail water, etc. which is the critical equipment to reduce the SS, COD, BOD, total phosphorus, etc.
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  • video Dissolved Air Flotation with Mud Bucket
    Dissolved Air Flotation with Mud Bucket
    The dissolved air flotation system of the mud hopper can play a transitional role, allowing the sludge to be discharged in a centralized manner while adding chemicals to the wastewater to purify the water quality further. When treating sewage containing a large amount of sediment, the mud hopper can also effectively prevent the repeated precipitation of suspended matter.
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  • Vortex Air Flotation
    Vortex Air Flotation
    The vortex air flotation system is a wastewater treatment technology used to remove grease, colloids, and suspended solids in sewage (especially petrochemical oily sewage).
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  • Highly Efficient Shallow Air Flotation Machine
    Highly Efficient Shallow Air Flotation Machine
    The shallow air flotation is cylindrical in shape, compact in structure, and shallow in the pool. The main body of the device consists of five parts: pool body, rotating water distribution mechanism, dissolved air release mechanism, frame mechanism, water collection mechanism, etc. The water inlet, water outlet, and scum discharge outlet are all concentrated in the central area of the pool body. The water distribution mechanism, water collection mechanism, and dissolved air release mechanism are all closely connected with the frame and rotate around the center of the pool body. This device provides a complete set of equipment assembly and control systems. The equipment can achieve optimal operating status through the combination of centralized control and decentralized control. Shallow air flotation is one of the critical items in the water supply treatment process, solid-liquid separation technology, and equipment. Shallow air flotation is one of the most effective methods for removing tiny suspended particles whose specific gravity is close to that of water.
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Advantages of Dissolved Air Flotation（DAF)​​​​​​​

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We have an excellent technical team, which can be designed according to customers requirements.
dissolved air flotation catalog picture
  • Surface load up to 10-30m3/ (m2.h) compact style to save the space.
  • Gas-water mixing efficiency is higher than 95%.
  • Complete system and easy to install.
  • High integration, efficient and simple operation.
  • Intelligent air suction, more energy saving equipment.
  • Top - in release, realizing non-stop maintenance.
  • Adjustable liquid level system and slag scraping system can control the moisture content of scum.
  • Professional supporting design and suggestions.
Interested in our DAF system?
Contact one of our engineer representatives and we will get back to you within 24 hours.

 

what is dissolved air flotation(DAF) ？

 
Dissolved air flotation is a solid-liquid separator in many bubbles in contact with the solids, lowering their density to water. Then, they will float up to the surface so that suspended solids of water, including oil and grease, without dissolving in water, can be reduced.DAF can be used in pretreatment, water reuse, deep treatment, phosphorus removal from tail water, etc., and critical equipment to reduce the ss, COD, body, and total phosphorus.
 

In which stage of sewage treatment is dissolved air flotation used ?

 
Dissolved air flotation is usually used in sewage treatment's primary or secondary treatment stages, mainly for solid-liquid separation and removal of floating pollutants. Specifically, the application stages of dissolved air flotation in sewage treatment include the following aspects:

1. Primary treatment stage: Dissolved air flotation can be used as the primary treatment process of the sewage treatment system to remove large suspended solids, grease, solid particles, etc., that affect the subsequent treatment effect. Through the air flotation tank, pollutants in the water are gathered on the surface to form scum, achieving preliminary solid-liquid separation.

2. Coagulant treatment stage: During the sewage treatment, coagulant is sometimes added to accelerate the aggregation and settlement of suspended solids. Dissolved air flotation can be combined with coagulants to remove residual suspended solids and colloidal substances from coagulated sewage.

3. Intermediate treatment stage: In the sewage treatment system, dissolved air flotation can also be used as an intermediate treatment process to remove tiny particulate matter, colloidal substances, and specific organic matter and improve the clarity and transparency of water quality.

4. Improve biological treatment efficiency: Dissolved air flotation treatment can reduce suspended pollutants and colloidal substances in the water, provide better water quality for subsequent biological treatment units, improve biological treatment efficiency, and reduce treatment difficulty. 

To sum up, dissolved air flotation is usually used in sewage treatment systems' primary or secondary treatment stages to achieve solid-liquid separation, remove floating pollutants, and improve water quality, providing a good water quality foundation for subsequent in-depth treatment.
 

What are the essential components of dissolved air flotation system?

 
Its main equipment includes an air flotation tank, slag scraping device, pressurized water pump, air compressor, pressure dissolved air tank, dissolved air release head and supporting coagulation and flocculation tank, scum collection device, stirring device, etc.
Its core technology is to ensure the pressure balance of the air-water two-phase in the pressure-dissolved air tank, so that as much air as possible is dissolved in the water and to avoid clogging of the dissolved air release head in the contact room.
 

How does dissolved air flotation work?

 
Dissolved air flotation takes the treated effluent through the circulating pump as circulating water which will enter the air compressor tank. The circulating water mixed with air, called air-saturated dissolved air water flows into releases, and a large number of nano-scale micro-bubbles are generated via releasers, and the micro-bubbles quickly attach to the coagulated suspended matter. When the density of suspended matter is gradually lower than that of water, it automatically rises to the surface. Clean water at the bottom of DAF, is discharged to the next step process to treatment. The scum-floating to the surface is scraped to the sludge tank by scrapers for further treatment.
 
Working principle of dissolved air flotation
Working principle of dissolved air flotation
Working principle of dissolved air flotation

China Dissolved Air Flotation Manufacturer

 

More flotation processes for you to choose

 
According to the different principles of bubble generation, flotation technology is divided into dissolved air flotation (DAF), dispersed air flotation (Induced air flotation), electrolytic flotation, biological and chemical flotation, etc. The most widely used are dissolved air flotation and dispersed air flotation. Dispersed air flotation is divided into microporous and cavitation air flotation (CAF). As China's leading air flotation manufacturer our company produces all the above flotations. If you want to learn more about the comprehensive knowledge of flotation, you can click "2024 Dissolved Air Flotation (DAF) Knowledge Encyclopedia" to view it.
  • Dissolved Air Flotation with Mud Bucket
    Read More
    Dissolved Air Flotation with Mud Bucket
  • Vortex Air Flotation
    Read More
    Vortex Air Flotation
  • Shallow Air Flotation Machine
    Read More
    Shallow Air Flotation Machine
Have a water or wastewater challenge? Get a free consultation

Manufacturing capabilities and experience

 
Wuxi Yosun Environmental is constantly innovating in the field of wastewater treatment. We customize each wastewater treatment equipment to provide customers with products that are more efficient, durable, and cost-effective than any other wastewater equipment manufacturer.
 
we can customize dissolved air flotation for various wastewater treatment application scenarios and strictly meet the requirements of wastewater treatment effluent indicators.

In terms of dissolved air flotation system and configuration
our engineers will help you choose the appropriate DAF system type (such as circular or rectangular tanks, single-stage or multi-stage systems, etc.), treatment capacity, material selection (such as stainless steel 304 or 316 to ensure the durability and corrosion resistance of the system).
 
Key components and functions
control the key components and functions throughout the process (e.g., the air dissolution system, the circulation system, and the chemical pretreatment).

In terms of operation and control
Wuxi Yosun Environmental adopts advanced automatic control systems and monitoring and maintenance systems to inspect and maintain equipment regularly to ensure the system's operation is adequate.
 
Product delivery stage
As a Chinese dissolved air flotation wastewater treatment supplier, we will strictly follow the design standard requirements in the pre-delivery stage of the product to carry out experiments and tests. These include conducting laboratory-scale experiments to verify design parameters and treatment effects and pilot tests to optimize system design and operating parameters further operating parameters.

During the product delivery
 installation, and commissioning phase, we will ensure that the dissolved air flotation equipment components are correctly connected and fixed. We will conduct multiple commissioning rounds to adjust parameters for the best treatment effect.

During the after-sales phase
we provide comprehensive operation training and technical support to solve problems that arise during operation.
1、We have an R&D and production team of more than 30 people and a production workshop of more than 3,000㎡.

2、Adopt flexible manufacturing technology. Provide customized solutions in <8 hours. Using computer-aided design (CAD), computer-aided manufacturing (CAM), and digital control systems can improve production efficiency and reduce human errors.

3、Advanced sewage treatment equipment production equipment, including laser cutters, bending machines, assembly equipment, and coating equipment.

4、A Strict quality management system and quality control process ensure the manufacturing and delivery of high-quality products.

5、Adopting modular design and production methods makes the product easier to assemble and install, while reducing transportation costs and on-site construction time.

6、Products are exported to more than 30 countries and regions, and the mature foreign trade service team provides 7*24 hours of pre-sales and after-sales services.
 

Our equipment customization process

As a dissolved air flotation wastewater treatment supplier in China,We have an excellent pre-sales and after-sales service team to ensure that customer problems are solved as soon as possible.
  • 1.Technical Support
    More+
    Based on technical data, such as water analysis, material, size, electric control, which buyers provide, Yosun can help to select the exact model and is able to design the drawings, as well as technical specifications, including but not limited to layout plan, civil condition, 3D diagram, electric circuit drawing, selection of material and power, and construction requirements.
  • 2.Contract Signing
    More+
    Technical specification confirmed well, the two parties should negotiate on price, payment terms, way of transportation and date of delivery etc.
  • 3.Contract Execution
    More+
     Depth design of machines and detailing drawings: preparing production drawing, BOM, electric drawing etc.

     Making production schedule: standardizing production according to timeline specifications

     Proceeding inspection: incoming inspection, in-process inspection and final inspection as per ISO standard.

     Completion: Issuing ITP and product certificate

    Delivery: informing the buyer to prepare for receiving the goods in advance and assisting to packing the good etc.
  • 4.Post-Sale
    More+
     After receiving the goods, Yosun is responsible for guiding installation and debugging.
     
     Providing operation manuals, maintenance plans, and long-term after-sales service.
     
    Long term supply of spare parts.

OUR Dissolved Air Flotation（DAF） Unit GALLERY

 

DAF Application Fields

Product manual download

Name Introduction Size Downloads Update Category Thumbnail Copy Link Download
DAF Catalog-Yosun.pdf DAF Catalog-Yosun 6.72MB 754 2024-04-03 download Copy Link Download

Dissolved Air Flotation Resources

  • [Blog] 2025 Dissolved Air Flotation (DAF) Knowledge Encyclopedia Part 1
    Sewage treatment is a crucial aspect of environmental protection projects. It requires proper planning and implementation to ensure its effectiveness. To improve the quality of sewage treatment, a treatment mode of pre-treatment, primary, secondary, and tertiary linkage is established based on the current status of sewage pollution. The joint application of various technologies is used to achieve sound sewage treatment effects. As industry technicians, it is essential to grasp the critical points of sewage treatment accurately, operate reasonably, optimize the technology, and improve its feasibility as the industry develops.Wuxi Yosun Environmental Protection Equipment Co.,Ltd
  • [Blog] Dissolved air flotation effluent indicators and specific requirements
    Dissolved air flotation (DAF) is a technology widely used in sewage treatment, mainly used to remove suspended solids, grease, heavy metals, biochemical oxygen demand (BOD), chemical oxygen demand (COD), and volatile organic pollutants in water.
  • [Textile Dyeing case] Case Studies-Pilot Test Study on Deep Treatment of Printing And Dyeing Wastewater
    The shallow flotation-ozone-BAF combined process was used to carry out a pilot test on the effluent from the secondary sedimentation tank after biochemical treatment to provide reference data for the actual application of the process in the later upgrading and transformation project. The influent was the effluent from the secondary sedimentation tank, and the designed water volume was 50 m3/d. The operation results showed that under the conditions of 1350 mg/L polyferric dosing, 120 mg/L decolorant dosing, and 40 mg/L ozone dosing, the average total removal rates of COD and chromaticity were 65% and 80,% respectively. All effluent indicators met the direct emission limits of the "Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry" (GB 4287-2012).
  • [Blog] Wastewater Grading Treatment
    Sewage treatment is a crucial aspect of environmental protection projects. It requires proper planning and implementation to ensure its effectiveness. To improve the quality of sewage treatment, a treatment mode of pre-treatment, primary, secondary, and tertiary linkage is established based on the current status of sewage pollution. The joint application of various technologies is used to achieve sound sewage treatment effects. As industry technicians, it is essential to grasp the critical points of sewage treatment accurately, operate reasonably, optimize the technology, and improve its feasibility as the industry develops.Wuxi Yosun Environmental Protection Equipment Co.,Ltd
  • [Blog] Factors Affecting The Water Quality of Dissolved Air Flotation Water
    Many factors affect the water quality of dissolved air flotation effluent. It is necessary to comprehensively consider various aspects and optimize the process and equipment to improve the treatment effect and effluent quality.
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