Dissolved Air Flotation:
A Reliable and Efficient Clarification Technology
www. h2flow DAF. com
ISO 9001:2015 Certified
EQUIPMENT AND TECHNOLOGY
Dissolved Air Flotation (DAF) is a clarification technology used
extensively for wastewater treatment in food plants, oil & gas,
mining, pulp & paper, many major industries and municipal
wastewater plants. DAF works extremely well for waters that have
fats, oils, grease, and very fine particles.
DAF can be used by itself as a clarifier, but when used with chemicals
such as a coagulant and a flocculant, it becomes a physical/
chemical process. A properly functioning DAF will remove:
• 90-95% of Total Suspended Solids (TSS)
• 90-95% of Fats, Oils & Grease (FOG)
• 90-95% of insoluble Biochemical
Oxygen Demand (BOD)
In the DAF, micro sized air bubbles are added to the water, providing
buoyancy to the impurities to be separated. The impurities float to the surface
and form a sludge layer, ready for separation by a skimmer. Air is introduced to the
DAF unit via a recycle pump system. A fraction of the treated water from the clean water
side leaving the unit is recirculated to the inlet of the DAF unit, and in this loop, air is introduced
to create the micro size air bubbles in the 30-50 micron range.
SKIMMER
ADJUSTABLE WEIR
INFLUENT www.h2flowDAF.com
SLUDGE DISCHARGE
BOTTOM SLUDGE DISCHARGE EFFLUENT
AERATION
POINTS
AIR
BLEED
VALVE
RECIRCULATION PUMP
AERATION VALVES
The recirculation pump pressurizes the water and
saturates it with a controlled amount of air. The air /
water mix is pumped to a saturation tank from where
it is distributed to various points at the inlet and
underneath the DAF.
The heavy solids which will not float, will sink to the
bottom of the flotation unit and will be discharged
with outlet valves. Larger DAF models are equipped
with bottom augers.
At the surface of the flotation unit, a skimmer skims off the floating sludge into a
sludge compartment. The speed of the skimmer system can be varied to influence
the dry solids content of the sludge. The % of dry solids can also be influenced by
the water level in the unit, via adjustable weirs.
The floating sludge removed by the skimmer unit is between 4-12 % dry solids.
A complete DAF system should include:
• Influent flow equalization tank and mixing
• Screening to protect pumps
• Feed pumps
• Chemical feed (pH adjustment,
coagulation, flocculation)
• Polymer make down system
• Mix tanks or in-line pipe flocculation
• Sludge pumping
• Sludge storage
• Pneumatic control panel
• Central PLC control panel to run the
complete system
• Additional treatment steps as needed H2FLOW DAF UNIT INSTALLED AT AN INDUSTRIAL FACILITY
(sludge dewatering, biological, etc.)
• Compressed air supply
H2Flow can provide a complete treatment system with all the above components, supplied by a single, experienced and
reliable source. H2FLOW has been supplying DAF systems for over 25 years.
H2Flow carries a wide range of DAF models including the traditional open style rectangular, compact plate packed models, and even
circular DAFs. With the variety of models we offer, H2Flow can meet almost any flow, solids loading, or space constraint needs many
industries face.
ALPHA
Traditional open style DAF, good for high solids loading, and low to
moderate flow rates.
Range: 22-800gpm (5-180m3/hr)
DELTA
Compact Plate pack model for fitting in tight foot prints. Medium solids
loading, low to moderate flow rates.
Range: 22-660gpm (5-150m3/hr)
GAMMA
Larger version of the Delta, meant for higher flow systems, with medium
solids loading.
Range: 990-2425gpm (225-550m3/hr)
PWL
The PWL flotation open style units are designed to treat wastewater with
high flows and solids loading.
Range: 880-1150gpm (200-260m3/hr)
SPC
Circular style DAF with a very wide range of flows, usually seen in high
flow ranges with light to medium solids loading.
Range: 70-11,000gpm (16-2500m3/hr)
RENTALS SERVICES CUSTOMERS
WATER AND WASTEWATER APPLICATIONS
DAF PILOT & RENTALS TREATMENT EQUIPMENT Food and Beverage
H2Flow offers complete ready Pulp & Paper
Engineered Solutions
to go mobile DAF units. Automotive
Design Assistance
Allow us to show you what a Quotations, Specifications and Drawings Metal & Steel
DAF can do for your water. Pilot Trials and Chemical Jar Testing Chemical & Petrochemical
Spare Parts Mining
Start-Up and Repair Services Power Generation Facilities
Operator Training Water Treatment Plants
Support and Troubleshooting Wastewater Treatment Plants
Maintenance Contracts Solid Waste Treatment Facilities
Rentals Oil and Gas
CONTAINERIZED UNIT Turn-key Installation Services Electronics
Recycling Facilities
SKID MOUNTED UNIT CLEAN WATER OVER WEIR 3D RENDERING OF DAF SYSTEM
PLC Panel
Controls entire DAF system
pH Adjustment and
Chemical Addition
Rotary
Screen
Screenings
Dissolved Air
Flotation
Unit Sludge
Pump Hauling /
Flow Disposal
Feed
Equalization Pumps Meter
FLOCCULATOR
www.h2flowDAF.com
Sludge
Tank Effluent to Tank
Sewer or Further
Treatment
Raw
Recirculation Pump
Influent
Submersible
Feed Pumps Optional Sludge Treatment
Collection Dewatering Press
Sump
Liquid Discharge
Solids Discharge Bin
TYPICAL DAF TREATMENT FLOW DIAGRAM, DESIGNED AND SUPPLIED BY H2FLOW
TORONTO: MONTREAL: VANCOUVER:
580 Oster Lane, Vaughan, 2398 boulevard Rosemont, 105 –19623 56th Ave,
Ontario L4K 2C1 Canada Montréal, Québec, Langley, British Columbia,
Tel: (905) 660-9775 H2G 1V1 Canada V3A 3X7 Canada
www.h2flowDAF.com info@h2flow.com Tél: (514) 228-3327 Tel: (604) 908-7398
