High-efficiency Shallow Flotation Equipment

FYY dissolved air flotation technology(DAF),is an effective,economical process for removing hard to separate Suspended Solids(TSS)and Fats,Oils&Grease(FOG)from wastewater and also for resolving overall water clarity issues.The FYY series of DAF is considered to be a“traditional”DAF design.However,FYY has optimized all aspects of this design through years of research,development and experience in the field.FYY DAF Systems have been successfully implemented in a variety of industries.

STANDARD FEATURES
Epoxy coated ASTM A-36carbon steel tank
API specified separation chamber
Integral large capacity Sludge reservoir
Seamlessly integrates with other wastewater products

AVAILABLE OPTIONS
Tank materials:A-36carbon steel(standard),stainless steel–304/316L
Pump packages(automatic,lift station):Influent,effluent,sludge
Sludge treatment packages:automatic sludge pump,sludge tank,dewatering systems
Integral mechanical sludge thickener
Vapor tight lid assembly
Integrated automatic chemical pre-treatment systems for pH adjustment,coagulant,polymer
Access platforms with ladder or stairs
Effluent monitoring and sampling
Influent equalization
Instrumentation and controls

Key Design Considerations

A Dissolved Air Flotation(DAF)system resolves suspended solids and clarity issues by reintroducing a slip stream of treated water(from the system’s effluent)back to the system’s influent.This pressurized,recycled water is saturated with dissolved air.When the pressure is released at the system’s influent,the air comes out of solution on the surface of suspended solids particles throughout the dissolved Air Flotation(DAF)influent mixing chamber.As these billions of micro bubbles come out of solution,they float the suspended solids particle to the surface of the dissolved air flotation(DAF)separation chamber,where they are removed by a surface skimmer.
The FYY DAF recirculation system is a micro bubble generator.A key factor for maximizing the efficiency of a DAF is the generation of equally sized micro bubbles.These bubbles, ranging from 10to 50microns in diameter,will give the suspended solids an equal and steady rise rate of 10to 12inches per minute,to the tank surface.
Our recirculation system is designed to completely saturate the recycle stream with air.By properly sizing our system(atomized water surface area,air dissolving rate,etc.)we can dissolve the maximum amount of air,physically possible,into the recycled water.
When the re-circulated flow reaches the DAF’s influent,it passes through a pressure release valve where it is released into the tank and allowed to return to normal atmospheric pressure.Fine micron bubbles spontaneously boil out of the recycled water solution.
As stated above,these billions of fine micron bubbles attach themselves to the suspended water particles in the wastewater,causing them to float to the tank surface where they form a firm surface sludge mat.
FYY manufactures complete dissolved air flotation(DAF)systems with recycle/air diffusion system including recycle pump,air saturation vessel and related controls.The DAF is sized to provide a surface loading rate equal to 3.0lbs/ft2/hour of TSS and FOG combined.The FYY dissolved air flotation system is designed to separate floatable particles of oil or solids by floating them to the surface with air bubbles.Our DAF system incorporates a high efficiency,high pressure air to water saturation contact recycle tank system,and a DAF separation cell with surface skimmer.The air bubbles form at the release of pressure and intimately contact the raw,incoming wastewater with a specially designed reaction nozzle system that promotes air bubble impingement with raw incoming wastewater particles and the forming air bubbles.The surface flight skimmer assembly drags the floated material to the skimming beach and into the float chamber.
How it Works

DAF Separation Chamber:
The separation cell can be fabricated with a flat bottom or a rectangular“V”bottom.The DAF cell is typically manufactured from carbon steel,but other materials of construction are available as an option.
DAF Surface Skimmer:
FYY provides a removable float skimming system with frame assembly and drive motor,sprockets,chains and full width stainless steel skimming blades.The skimmer blades are mounted on swivel pins that are fastened to the skimmer chains,which maintain the blades in a down position at all times.The conveyer chains are provided with drive sprockets on a full width shaft at the drive end and four independent idler sprockets at the return end.The skimmer system frame comes equipped with a sprocket tension adjustment device and the carrying and return tracks for the chain.The entire system is self supporting with side and end channels,and cross members with lifting lugs that permit removal of the skimmer assembly as a complete unit for easy cleaning and service.The skimmer drive system comes with a hollow shaft,maintenance free gear reducer.The skimmer system can be made vapor tight with the addition of optional cover panel.
Air Introduction Systems:FYY specializes in two fundamental air introduction systems.Both systems are equally capable and may be chosen depending on client preferences.
Option 1:Recycle/Air Dissolving System(RAD):
The FYY dissolved air flotation system comes standard with a recycle water air dissolving system rated at 50%of the DAF design flow,providing an air to solids ratio(A/S)of between 0.015and 0.040lbs air/lbs.solids.Standard models are designed for 100psi,100degree F.The air dissolution tank is fitted with an internal water cascading nozzle system to ensure efficient mass transfer and air/water contact.The tank is provided with an independent safety pressure relief valve and pressure gauge.The air dissolution tank is provided with an external,clear sight tube with water/air interface level float sensor system for automatic water/air level control.Manual flow control valves are provided for balancing the recycle rate,for the rate control of the air addition,the saturated recycle rate to the DAF inlet reaction jet,and the pump by-pass flow volume.

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