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Dissolved Air Flotation (DAF) Systems

High-Efficiency Dissolved Air Flotation Manufacturer
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Product Advantages​​​​​​​

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 ？

 
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?

 
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
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Manufacturing capabilities and experience

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

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
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    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
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    Technical specification confirmed well, the two parties should negotiate on price, payment terms, way of transportation and date of delivery etc.
  • 3.Contract Execution
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     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
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     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 DAF 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 721 2024-04-03 download Copy Link Download
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