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DAF Dissolved Air Flotation
Dissolved Air Flotation Machine(DAF) is a high efficiency TSS removal wastewater pretreatment equipment that clarifies wastewater by removing suspended matters such as oil, colloids or other suspended solids.
The removal is achieved by dissolving air into water under pressure and then releasing the air to atmospheric pressure in flotation tank.The feed water to DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to coagulate the colloidal particles and/or flocculants to conglomerate the particles into bigger clusters.
A portion of clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called air drum or saturator) into which compressed air is also introduced. This process saturates pressurized effluent water with air under pressure(2.5-4kg/cm2).
The air-saturated water stream is recycled to the front of the float tank and flows through a pressure reduction valve just as it enters the front of the float tank, which results in the air being released in the form of tiny bubbles(Φ5-20μm).These bubbles attach to, and form with, the solids or chemical flocculants entering the vessel, causing them to float to water surface where they are retained and forms scum layer, which is then subsequently removed by DAF skimmer.
DAF dissolved air flotation machine is an important pretreatment process, mainly used to remove SS, ie. suspended solids from wastewater, like oil, grease, fiber, colloids, SS removal rate can be >90%, even can reach 99%. The main applications are:
◆ Reduce turbidity for lake water, river water and pond water.
◆ Color removal and impurities removal for textile and dyeing wastewater.
◆ Algae removal/collection.
◆ Paper mills pulp and water recycling for paper-making wastewater.
◆ F.O.G(fat, oil, grease) removal
◆ Oil removal for oily wastewater in oil refineries, petrochemical, etc.
◆ Pretreatment to meet sewer discharge limits
◆ Pretreatment to reduce loading on downstream biological treatment systems
◆ Polishing of biological treatment effluent
◆ Other solid-liquid separation and liquid-liquid separation.
|Model||Flow Rate(m3/h)||Reflux Pump Power(kW)||Skimmer Power(kW)||Overall Size(mm)|
* The material of the DAF could be carbon steel, or stainless steel , PVC.
DAF dissolved air flotation machine is an an open style high efficiency wastewater pretreatment system that clarifies wastewater by removing suspended matters such as oil, colloid, suspended solids, etc.
The removal is achieved by dissolving air into wastewater under pressure and then releasing the air to atmospheric pressure in flotation tank.
※ Paper Mills Paper Making Wastewater Treatment
※ Oily Industrial Wastewater Treatment
※ Vehicle Washing Car Washing Wasewater Treatment
※ Textile Printing and Dyeing Wastewater Treatment
※ Tannery Wastewater Treatment
※ Food Processing Wastewater Treatment
※ Slaughterhouse Wastewater Treatment