AquaFarm DAF Unit for Aquaculture Wastewater

Dissolved air flotation description

DAF systems are widely recognized for their ability to mitigate issues related to sedimentation and gravity thickening methods. Unlike traditional methods, which often rely heavily on the weight of solids to facilitate separation, dissolved-air flotation relies on the buoyancy provided by air bubbles. This shift in mechanism results in enhanced removal efficiencies, especially in low-density or finely suspended particles. Consequently, DAF has emerged as a preferred choice across various industries, particularly where space is limited or where rapid treatment times are necessary.

Dissolved air flotation principle

Dissolved air flotation (DAF) systems remove suspended solids, fats, oils, greases and non-soluble organics by dissolving air into pressurized water. Here’s how this highly efficient dissolved air flotation process works:

Water enters the WWW™ DAF system through the influent header box to reduce the water’s velocity and distribute it across the length of the vessel. To optimize the treatment process, we design the influent header box with multiple injection points, allowing the introduction of whitewater — a highly saturated pressurized stream of air and DAF effluent that sometimes includes flocculant.

The whitewater forms micro-bubbles and as the wastewater enters the flotation zone, the micro-bubbles attach to the particle surface, lowering the particle density enough to cause suspended solids, fats, oils, greases and non-soluble organics to separate from the wastewater and rise to the surface. The now separated solids, fats, oils, greases and non-soluble organics are skimmed and removed by a chain-and-flight skimmer into the sludge hopper.

Dissolved air flotation technical sheet

Dissolved air flotation process flow

Dissolved air flotation advantage

Improved Water Quality
Greater turbidity reduction
Discharge compliance
Greater treatment flexibility
Reduced chemical consumption
Operational Advantages
Small footprint
Zero backwash
Improved product quality
Simple and easy operation
Reduced downtime and operational cost

Dissolved air flotation feature

The environmental impact of DAF systems is generally positive, particularly in minimizing water pollution. By enabling the removal of over 90% of harmful components from industrial effluents, DAF systems contribute to cleaner water bodies and reduced environmental pollution. Moreover, reduced chemical usage and advancements in energy-efficient designs further enhance the sustainability of DAF technology.

Dissolved air flotation application

Wastewater TreatmentDissolved air flotation systems are commonly used in the following industries and production processes.

Petroleum, petrochemical and refineries
Natural gas processing plants
Pharmaceutical and cosmetics
Mining, quarrying and aggregate production
Water and wastewater treatment
Food processing
Commercial and industrial laundry
Pulp and paper production
Algae removal and desalination pretreatment
Pretreatment for downstream biological treatment systems

Contact Us for a Consultation

• Company: Wuxi Dajiang Environmental Technology Co., Ltd.  DAGYEE
• Phone/WhatsApp:+8613961861780
• Email: info@dagyee.com
• Website: www.dagyee.com