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Dissolved Air Flotation System
700,000 - 2,500,000 Per Set
01 Piece(s) (MOQ)
NeoTech DAF process consists of super saturation of discharge water from the effluent end of the system tank with air. The super saturated water stream is then mixed with the waste stream and pressurized in pressure tube. A sudden release of pressure from the saturated stream millions of microscopic bubbles form and attach themselves to the contaminants of oil and solids in the wastewater, thereby changing their buoyancy and floating them to the water surface where they can be skimmed and removed from the water. NeoTech also offer a combined chemical pretreatment to improve DAF solids removal efficiencies. Features : The use of chemical flocculants with DAF is based on system efficiency, application contaminant characteristics and cost. Chemical pretreatment often improves DAF solids removal efficiencies. The use of chemical flocculants with DAF is based on system efficiency, application (use of DAF) contaminant characteristics and cost. Commonly used chemicals include trivalent metallic salts of iron, such as FeCI2 or FeSO4 or aluminum, such as AISO4. Organic and inorganic polymers (cationic or anionic) are often used to enhance the flotation process. The most commonly used inorganic polymers are the polyacrylamides. Attachment of most of the bubbles to solid particles can be effected through surface energies while others are trapped by the solids or by hydrous oxide flocs as the floc spreads out in the water column. Colloidal solids are normally too small to allow formation of sufficient air-particle bonding. They must first be coagulated by a chemical such as the aluminum or iron compounds mentioned above and then absorbed by the hydrous metal oxide floc generated by these compounds. Frequently the coagulant is required in combination with the flocculant. Optional Facility : 304/316 Stainless Construction Emulsion Breaking System Chemical Pretreatment Sludge Pump out Float Pump out Effluent Pump out Influent Feed pH Adjustment System
Dissolved Air Floatation System
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Dissolved Air Flotation (DAF) is a clarification process for the separation of solids, grease and oils. It works by producing a stream of micro-fine air bubbles that attach to solids and float them to the surface where they can be removed by a surface scraping mechanism. DAF is ideally suited to particles and flocs that are slow settling, neutral density or buoyant. This is particularly relevant to food and other industries where solids are light and voluminous and so not suited to settling. DAF also takes up considerably less space than settling methods, generally less than 25% equivalent surface area needed. Dissolved air flotation is very widely used in treating the industrial wastewater effluents from oil refineries, petrochemical and chemical plants, natural gas processing plants, paper mills, general water treatment and similar industrial facilities. A very similar process known as induced gas flotation is also used for wastewater treatment. Froth flotation is commonly used in the processing of mineral ores. Mechanism of Dissolved Air Flotation: Solid particles in liquid suspension become attached to microscopic air bubbles. Waste flow or a portion of clarified effluent is pressurized to 3.4 – 4.8 bar in the presence of sufficient air to approach saturation. When pressurized air-liquid mixture is released to atmospheric pressure, minute air bubbles are released from the solution.Agglomerate rise to the surface to join other particles and form a blanket that can be removed mechanically. Flotation is used primarily to remove light suspended solids. Sludge flocs, suspended solids, oil globules are floated by the air bubbles which: Attach to floc particles Become enmeshed in floc particles. Further air-solid mixture is skimmed off from the surface. Clarified liquid is removed from the bottom. A portion of the effluent is recycled back to the pressure chamber. Benefits Simple in operation Less startup time Easily relocated One man inspection is sufficient Very compact, occupies very less space Less maintenance, low capital & operation cost
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