Dissolved Air Flotation System

We offer highly efficient Dissolved Air Flotation System in the market. Our Dissolved Air Flotation System works faultlessly and ensures quick performance. Operation

• Wastewater from Equalisation/Aeration tank is delivered by feed pump at low head to the over ground DAF-Clarifier through rotating Hydraulic Joint and is released all along the radius through contgrollableapertures.
• The flow of water is in clockwise direction & the distribution pipe rotates in anticlockwise direction to create nearly zero relative velocity so as to achieve quiescent state in the main TUB
• Saturated dissolved air gets released in the form of microscopic bubbles which attach to the fine suspended solids & colloids.
• Due to buoyancy effect, these SS particles are carried upwards at a fast rate of up to 300mm/min forming a thick floating smudge blanket that keeps on thickening until picked up by Rotating Sludge Skimmer into the Floated Sludge Shell.
• The clarified water below sludge blanket is directed to Rotating Middle Shell & it flows by gravity to adjustable weir that presents the sludge-to-sludge skimmer at desired height.
• Sediment able particles are swept into built in sludge tray by a scraper attached to the rotating middle shell
• A fractional H.P. Variable speed drive rotates both the shell & the sludge skimmer.

• Consists of a 300 mm tube with micro porous air sparger
• Part of the clarified water is made to pass across the air sparger at high pressure & velocity absorbing air up to saturation level.
• It is subsequently depressurized to release micronic bubbles in the main Tub
• Air is fed at a controlled rate through glass tube rotameters.

• Extremely low Hydraulic retention time of only 4 minutes makes the unit very compact, light weight with high specific clarification (Volumetrically less than 1/30th Size).
• Most modern clarification system with efficiency morethan 96-98%.
• Due to low retention time & infusion of Air/Oxygen dissolved oxygen levels are high resulting in better aerobic growth which eliminates chances of septicity.
• Shallow, open, self-cleaning, pre-fabricated design is shiftable leading to fast erection in small area.
• Light chemicals like Alum & Poly electrolytes leads to lower volumes of high consistancy sludge, easier to dry up on smaller bed areas there by reducing further cost on sludge handling,bed construction & transportation etc.
• Quick transfer of aerated sludge to aeration tank eliminates chances of anaerobic shockto microorganisms leading to better biological growth.
• Works simultaneously by sedimentation & flotation. Can handle rising sludge & bulking sludge effectively.
• Used as savealls in paper Mills, 100% closed water system feasible with complete fibre recovery.
• Excellent for naturally floating pollutants like oil & grease, Oil. Recovery possible in industries like Petrochemical, Vanaspati, Cokeoven batteries, paint shops etc.
• Primary & Secondary clarification is possible within minutes in industries like paper & pulp, textile, starch, Tannery, Wool.

• High Hydraulic Retention time of more than 2 hours makes the system bulky.
• Efficiency of sedimentation processes is mostly not beyond 65%.Effluent turns septic & thereby leads to foul smell due to high retention time.
• Permanent huge civil constructions requires a large area.
• Lime is used to creat settlable flocs leading to very high sludge quantities difficult todry up & dispose off.
• Anaerobic conditions at times develop which upsets the biological system.
• Works by sedimentation alone, rising sludge difficult to handle.
• Closed water system & fibre recovery in Paper Mills not effective.
• Oil recovery not possible due to sedimentation process.
• Primary & Secondary clarification takes time.