Dissolved Air Flotation (DAF)

Efficiency for Removing Solids, Fats, Oils, and Phosphorus from Industrial Wastewater

Dissolved Air Flotation (DAF), an advanced technology effective in removing suspended solids, fats, oils, and phosphorus from industrial wastewater. Using microbubble generation, this technology combines traditional design with modern innovation for optimal results in water treatment.

Application

• Biological Treatment: Effectively manage biological waste.
• Dairy Industry: Removing fats and solids from the milk production process.
• Electronics: Purifying water for electronics manufacturing processes.
• Agriculture: Treatment of agricultural wastewater for reuse.
• Food & Beverage: Keeping water clean in the production process.
• Leachate: Managingleachate water with high efficiency.
• Meat Processing: Removing fat and protein from meat processing waste.
• Mining Industry: Treating mine water to meet environmental standards.
• Paper Mill: Managing wastewater from paper production.
• Pharmaceuticals: Maintaining water quality in the production of pharmaceuticals.

Key Features

• High Efficiency: Removes TSS and FOG with a high-performance dissolved water system, achieving up to 99.9% air release efficiency.
• Proven Reliability: Has been used in over 2,000 applications across multiple industries.
• Space-Saving Design: Compact and efficient Betaqua DAF unit.
• Easy Installation: Betaqua DAF units are supplied prefabricated, ready to install.
• Quick Response and Global Support: Supporting clients in over 50 countries with fast and reliable international service.
• Durable Materials: Available in various materials such as carbon steel with epoxy coating or FRP coating, stainless steel SUS304 or SUS316L, and duplex steel 2205 or 2507.

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Specifications of Dissolved Air Flotation

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Typical Applications

• Palm Oil Industry (CPO) — Removes free oil, suspended solids, and fat residues from POME (Palm Oil Mill Effluent) before biological treatment, significantly reducing organic loading.
• Meat and Fisheries Processing — Separates fats, suspended proteins, and TSS from slaughterhouse, fish processing, and seafood industry wastewater with >90% removal efficiency.
• Paper and Pulp Industry — Removes fine cellulose fibres, pitch, and ink from deinking and bleaching process wastewater before biological treatment stages.
• Dairy Processing Industry — Separates milk fat and casein protein from dairy plant wastewater, producing pre-treated effluent with FOG < 50 mg/L.
• Surface Water Treatment (Pre-treatment) — DAF is used as a replacement or supplement to clarifiers at water treatment plants with high algae loads, mechanically removing algal cells without heavy coagulation.
• Mining Industry — Treats mine wastewater containing fine mineral particles and equipment oil to meet discharge standards before release to the environment.

Compatible Products

• Moving Bed Bioreactors (MBBR) — DAF as pre-treatment for MBBR or other biological systems reduces FOG and coarse TSS that can inhibit biofilm growth and poison biological biomass.
• Membrane Bio Reactors (MBR) — DAF + MBR combination in food industry wastewater treatment trains produces very high quality effluent ready for discharge or reuse.
• Betagard PAC Series — Adding PAC or coagulant upstream of the DAF unit improves floc formation, increasing TSS and FOG flotation efficiency, especially for wastewater with very fine particles.

Installation Context

Betaqua DAF units are supplied prefabricated (skid-mounted) in epoxy-coated carbon steel, SUS304, or SUS316L stainless steel depending on wastewater corrosivity. The system consists of a saturation vessel (pressurised tank), recycle pump, and main DAF tank with an automatic skimmer. Footprint for a 20-50 m³/h capacity unit is approximately 4×3 metres, excluding coagulant and flocculant dosing tanks. Required utilities include three-phase 380 V power for the recycle pump and skimmer, compressed air at 6-8 bar (or an integrated compressor), and feed water supply at 1-2 bar. Float sludge (skimmings) generated requires further handling — thickener or belt press. Commissioning takes 2-3 working days including saturation pressure calibration, TSS/FOG removal efficiency testing, and operator training.