Dissolved Air Flotation (DAF) Systems

Aries designs and manufactures Dissolved Air Flotation (DAF) clarifiers for wastewater. In addition to its standard Aries design Aries can manufacture DAF clarifiers to meet a customers’ unique process requirements or physical space constraints. Aries constructs DAF clarifiers using epoxy coated mild steel, stainless steel or polyethylene.

Dissolved Air Flotation is an effective process used for the separation of suspended solids, oils and greases, and other insoluble impurities from water. The Aries DAF systems use chemical pretreatment and micro air bubbles to separate contaminants from water. Pretreatment of wastewater lowers total suspended solids (TSS), oils and greases, biochemical oxygen demand (BOD), and metal concentrations. Some of the DAF clarified effluent is recirculated and supersaturated with air under high pressure. When this water is released into the skimming tank under atmospheric conditions, micro-bubbles form and carry the suspended solids to the surface for removal.

Listed below are a few of the applications in which a wastewater DAF system is efficient and cost-effective.

DAF system
  • Activated Sludge Thickening
  • Aircraft Maintenance
  • Algae Removal
  • Automotive Industry
  • Bakery Waste
  • Ballast Water
  • Canning Chemical Processing Plants
  • Cleaning
  • Dairy and Milk Processing
  • Fiber Recovery
  • Fly Ash
  • Food Processing
  • Latex and Rubber Industry
  • Laundry
  • Meat Packing
  • Mining
  • Oil & Grease Removal
  • Paint Waste
  • Produced Water and Fracking
  • Pulp and Paper Mills
  • Paper Making
  • Pet Foods
  • Pharmaceutical
  • Potato Processing
  • Poultry Processing
  • Refinery
  • Rendering Seafood Processing
  • Slaughter House
  • Tank and Truck Cleaning
  • Tanning
  • Textiles
  • Water Recycling

Aries Equipment Engineers can custom design and manufacture a wastewater DAF pretreatment system for your specific application.

Removal Efficiencies
TSS (total suspended solids)
70% – 98%
BOD (biochemical oxygen demand)
40% – 60%
Oils & Greases
80% – 95%
70% – 95%

Process Description

Dissolved Air Flotation System Operation

DAF system - installed
The chemical pretreatment using pH control, coagulation, and flocculation optimizes the surface properties of the contaminants for micro-bubble adhesion. pH control is utilized to manipulate the influent to the optimum level for flocculation. Coagulation neutralizes the charge on the individual particles, canceling the existing repulsive forces between them. The coagulant is fed into the influent pipe and the pH control chemicals and flocculant are fed into the flocculation section. Flocculation involves the addition of a long-chain polymer, which causes the particles to connect together and form larger flocs**. A variable speed mixer or serpentine influent PVC piping is tailored to enhance mixing of the chemicals.

The recycle pressurization method is responsible for adequate loading of air bubbles into the system. High pressure (~100 psi) recirculation system supersaturates the water with air. When this water flows into the wastewater floatation tank micro-bubbles (~30 µm) form. The micro-bubbles adhere to waste particles and cause them to float to the surface where they are removed with a sludge flight system.

Sludge Removal

The low maintenance sludge flight mechanism is composed of a Polymeric chain system with the head shaft driven by a Browning mechanical speed reducer with a roller chain and sprockets. Flight constructed of 304SS with chemical and heat-resistant wipers drag the float over the beach and into the sludge sump. The weight of the flight system is sufficient to provide a squeezing effect at the beach as the flight carries the float over the beach to the discharge sump.

An automatic sludge transfer system with a level control device pumps the sludge from the sludge section into sludge holding tanks.

wastewater dissolved air flotation system - installed

Treatability Study Services

To determine the feasibility of an Aries DAF for your process or application, Aries may provide bench scale jar testing to determine removal efficiencies and floatation characteristics. Selection of a cost-effective chemical program can also be provided. Our evaluation of your wastewater samples allows Aries to determine several wastewater DAF design variables. Upon testing completion you will be sent a lab report outlining the benefits made possible by adding a DAF to your treatment system.

Aries DAF system

Standard Equipment

  • Heavy Duty Construction Utilizing Epoxy
  • Coated Carbon Steel
  • Non-corroding Sludge Flights with Programmable On/Off Cycles
  • Pressure Recycle Transfer System
  • Control Panel with Nema 4 Enclosure

Equipment Options

  • Flocculant Tank with Variable Speed Drive
  • pH Control System
  • Serpentine influent/chemical mixing header
  • 304SS or 316SS Construction
  • Chemical Feed Systems
  • Turbidity Monitoring
  • Rapid Mix Section
  • Feed Pumps, Sludge Pumps
  • Sludge Tanks and Dewatering Presses
  • Complete System Design and Fabrication Capabilities
  • Turnkey Installations
V-bottom DAF specs

V-Bottom DAF Specification Sheet

flat bottom DAF specs

Flat Bottom DAF Specification Sheet

Click here to download a PDF of this information.

Aries offers a full line of industrial wastewater treatment chemicals and DAF system components. Chemicals include coagulants, demulsifiers and flocculants. DAF system components include equalization tanks, oil-water separators, mixers, pH control, chemical feed & control, sludge thickening and de-watering.

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