Dissolved Air Flotation
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China [CN] Dissolved Air Flotation Description
The DAF unit technology uses extremely small air bubbles to lift suspended solids and oil to the top surface. The formed sludge layer is scraped into a sludge holding tank. The addition of coagulation and flocculation chemicals may be required to enhance the performance.
Removal efficiency is usually superior to gravity bases systems and often applied as polishing step (downstream of CPI)
The DAF unit can be supplied with a gas-tight cover, coagulation & flocculation dosing and mixing equipment and air-saturation by special pumps or in separate pressure vessel.
Flotation consists of separating solids from the water phase by attaching the solids to fine air bubbles to decrease the densityof the particles which float instead of sinking. The rising solids are called the “float” and are skimmed off the surface and further processed in the sludge train.Chemicals can be added to improve the separation: first for coagulation and then for flocculation.
The type of flotation used by Dissolved Air Flotation (DAF), in which the suspension is saturated with air at high pressure. Bubbles are released to the water and will attach to the suspended solids.The bubbles from a DAF system are much smaller than in other types of flotation systems and better adhere to the solids.This makes
DAF one of the most efficient flotation options of wastewater treatment.
Dissolved Air Flotation Feature
Adjustable effluent weir troughs
Epoxy coated carbon steel tank
Factory tested
Seamlessly integrates with other DAGYEE offered wastewater products
Stand alone operation
Standard units can be manufactured for flows from 5 gpm to 3500 gpm and above, in a single above grade tank
Structural steel support legs
Dissolved Air Flotation Available Options
Access platforms with ladder or stairs
Automatic sludge pump out packages
Chemical pretreatment systems
Concrete tank designs for large in ground installations
Duplex systems for redundancy
Effluent monitoring
Effluent sampling
Explosion-proof design
Flash mix/flocculation tanks with mixers
Full FRP or stainless steel construction
Influent equalization
Influent / effluent lift stations
Instrumentation and controls
Removable covers with gaskets
Integral mechanical sludge thickener
On board reagent storage (day tanks)
Pilot size units for on-site testing
Potable water design
Special coatings
Sludge handling and dewatering
Dissolved Air Flotation Applications
Enhance primary treatment performance
without adding chemicals
Solids separation upstream of secondary processes such as:
Oxidation Ditches
Sequencing Batch Reactors
Biological Aerated Filters
Dissolved Air Flotation -Moving Bed Bio Reactors -Membrane Bio Reactors Primary treatment for new plants Grit removal after a coarse screen
Increase primary or secondary process capacity
Plant expansion where land is expensive or unavailable
Dig-free, concrete-free solution for mountainous or earthquake-prone areas
Combined sewer overflow (CSO) treatment
Stormwater treatment
Contact us:
Shadow Chen
Wuxi Dajiang Environmental Technology Co., Ltd.
P: (86) 0510 85100889
M: (86)13861755094
E: shadowchen@dagyee.com
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