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 se 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 troughsEpoxy coated carbon steel tankFactory testedSeamlessly integrates with other Hydro-Flo offered wastewater productsStand alone operationStandard units can be manufactured for flows from 5 gpm to 3500 gpm and above, in a single above grade tankStructural steel support legs
Dissolved Air Flotation Available Options
Access platforms with ladder or stairsAutomatic sludge pump out packagesChemical pretreatment systemsConcrete tank designs for large in ground installationsDuplex systems for redundancyEffluent monitoringEffluent samplingExplosion-proof designFlash mix/flocculation tanks with mixersFull FRP or stainless steel constructionInfluent equalizationInfluent / effluent lift stationsInstrumentation and controlsRemovable covers with gasketsIntegral mechanical sludge thickenerOn board reagent storage (day tanks)Pilot size units for on-site testingPotable water designSpecial coatingsSludge handling and dewatering
Dissolved Air Flotation Applications
Enhance primary treatment performancewithout adding chemicalsSolids separation upstream of secondary processes such as:Oxidation DitchesSequencing Batch ReactorsBiological Aerated FiltersDissolved Air Flotation -Moving Bed Bio Reactors -Membrane Bio Reactors Primary treatment for new plants Grit removal after a coarse screenIncrease primary or secondary process capacityPlant expansion where land is expensive or unavailableDig-free, concrete-free solution for mountainous or earthquake-prone areasCombined sewer overflow (CSO) treatmentStormwater treatment
Shadow Chen
Wuxi Dajiang Environmental Technology Co., Ltd.
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