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DAF (Dissolved Air Flotation)

Description:The DAF system uses dissolved air to release micro-bubbles, which adsorb suspended solids in the water and float them to the surface. Through scum scraping and separation, it efficiently treats wastewater containing oil and suspended solids.
Key Advantages:Compact design, fully automated operation, low energy consumption, easy management, simple operation.
Applications:Removal of various heavy metal ions;

industries such as electroplating, chemical, textile, food, paper, petrochemical, leather, etc.;

biological treatment, sludge thickening, purification, etc.

Efficiency:5-100 m³/h
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  • Products Details
  • Functional Logic
  • Application Scenarios
  • Customized Service
  • Core Advantages
ParametersContents
Model / SpecificationsMHQF-X (X = Processing volume m³/h)
Treatment Capacity5-100 m³/h
Effluent Water QualityCapable of removing SS, oils, and a small amount of COD (20%-30%)
Material OptionsAnti-corrosive Carbon Steel, Stainless Steel
Overall DimensionsL: 1500-12000 mm
W: 1000-4800 mm
H: 1300-2500 mm
Core Treatment TechnologyDissolved air - Gas release - Adhesion - Skimming separation
Core Components & ConfigurationsMain motor, Air compressor, Skimmer, Mixer, Dissolved air tank, Automatic control cabinet, High-pressure pump
Operating Power2-28 kW
Operation ModeFully Auto PLC, Manual, Remote
Dissolved Air Pressure (MPa)0.4-0.8 MPa
Skimming SpeedAdjustable

FAQ

Q1: What are the advantages of DAF over conventional sedimentation?

Conventional sedimentation struggles with light particles, oil, and grease while taking up significant space. DAF uses microbubbles for rapid solid-liquid separation, requiring only 1/3 the footprint of a clarifier while offering superior shock-load resistance and stable effluent quality for strict discharge standards.

Q2:Why is the effluent turbid or exceeding TSS limits?

This is typically caused by low saturation pressure, clogged release nozzles, unbalanced chemical dosing, or hydraulic overloading. Quick fix: Clean blocked nozzles, adjust dissolved air pressure, rebalance coagulant/flocculant dosage, and stabilize influent flow.

Q3: How to fix high sludge moisture or poor skimming?

High moisture and incomplete scum removal result from high tank water levels, fast scraper speeds, or chemical overdosing. Quick fix: Lower the operating water level, reduce scraper speed to let scum compact, and optimize chemical dosage for denser flocs.

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Functional Logic

Core Mechanism — Micro-bubble Adsorption & Buoyancy Separation The DAF system uses a vast number of micro-bubbles as carriers to adhere to impurities, allowing them to rise to the surface for separation.Process Steps:

Air Dissolving: A portion of treated water is recirculated and pressurized in the Air Dissolving Tank, where it is saturated with air.

Air Releasing: The saturated water passes through a releaser to reduce pressure, releasing ultra-fine micro-bubbles.

Adhesion: Micro-bubbles collide and bond with suspended solids (SS), oils, and colloids, forming low-density "gas-solid" complexes.

Flotation & Separation· Scum Removal: The complexes float to the surface to form a scum layer, which is removed by a skimmer.
· Clarified Water: Cleaned water is discharged from the bottom of the tank.

 

Key Advantages

· Superior Skimming & Release Quality
· Ultra-fine Micro-bubble lead to very high solids removal efficiency
· Optimal Air-Dissolution Efficiency
· Robust & Reliable Performance
· Seamlessly Integrated Control System

Parameters Contents
Food Processing & Slaughtering
  • Slaughtering, Meat, and Aquatic Processing: Removal of fats, grease, blood stains, proteins, and suspended solids.
  • Dairy, Beverage, Brewing, and Starch/Soy Products: Removal of emulsions, starch, colloids, and COD.
  • Catering / Central Kitchens: Oil separation + residue removal; replaces traditional oil interceptors.
Paper-making & Fiber Processing
  • White Water Recovery，Clean water recycling and reuse.
  • Middle-stage Wastewater / Black Liquor: Removal of short fibers, fillers, colloids; reduction of SS/COD.
Petrochemical & Oily Wastewater
  • Refining and Oilfields: Separation of floating oil, emulsified oil, and dissolved oil.
  • Machining, Automotive/Parts, and Steel Rolling: Treatment of cutting fluids, emulsions, cleaning wastewater, and metal powders.
  • Ships, Ports, and Gas Stations: Pre-treatment of oily sewage.
Textile, Printing, Dyeing & Chemical Fiber
  • Dyeing & Printing: Removal of dye particles, sizing agents, fibers, chroma (color), and COD.
  • Chemical Fiber Wastewater: Removal of short fibers, oil agents, and colloids.
Electroplating & Metal Surface Treatment
  • Heavy Metal Removal: Removal of Cu, Ni, Zn, Cr, etc., phosphating slag, emulsified oil, and suspended solids.
  • Electrolytic Air Flotation: Capable of simultaneous oxidation, complex-breaking, and decolorization.
Municipal & Urban Wastewater
  • Pre-treatment: Replaces primary sedimentation tanks; removes SS, grease, and algae to reduce biochemical load.
  • Advanced Treatment / Upgrading: Phosphorus removal, turbidity reduction, and algae removal to meet Class 1-A / Quasi-IV standards.
  • Sludge Thickening: Increases sludge solid content and reduces disposal costs.
Electronics & Semiconductors
  • Ultrapure Water Front-end: Removal of micro-particles, colloids, and organic matter.
  • Cleaning Wastewater & Etching Solutions: Pre-treatment of heavy metals and fluorides.
Pharmaceuticals & Chemicals
  • Biopharmaceuticals and APIs: Removal of mycelium, proteins, colloids, and suspended solids.
  • Fine Chemicals and Pesticides: Removal of emulsified oils, organic solvent droplets, and hard-to-settle suspended solids.
Other High-frequency Industries
  • Aquaculture / Livestock: Purification of manure/waste and breeding water; pre-treatment for ammonia nitrogen removal.
  • Car Wash / Auto Repair: Reuse of oily and silty cleaning wastewater.
  • Rivers, Lakes, and Landscapes: Algae removal, turbidity reduction, and ecological restoration.
  • Seawater Desalination: Pre-treatment for algae and colloid removal.

 

Parameters Contents
Airflow Capacity Customizable equipment sizes tailored to specific processing volume
Material Options Optional anti-corrosive carbon steel/stainless steel housing
Remote Monitoring Optional remote monitoring system integration.
Parameters Contents
Performance · High Throughput : Optimized system design ensures superior treatment efficiency and rapid processing.
Cost Advantage · Optimized Space: Reduced footprint allows for flexible installation in space-constrained sites.
· High Efficiency: Low energy consumption achieved through advanced system integration.
· Low total cost of ownership driven by minimal OPEX.
Operation Fully automated PLC control with unmanned operation.
Customizable HMI touchscreen for intuitive and user-friendly operation.
Materials & Durability Carbon steel (anti-corrosion) 5+ years
Stainless steel 10+ years
Actual lifespan varies significantly depending on water quality
Adaptability · Versatile Adaptability: Handles diverse influent water qualities.

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