Dissolved air flotation is very widely used in treating the industrial waste water 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 waste water treatment. Froth flotation is commonly used in the processing of mineral ores.
The vibrating equipment is efficient new, multi-layer vibration equipment for stone quarries and sand filters can also be used as classification processing, building materials, electricity, coal, the role of chemical industry products, with the sound vibration of a small, reliable structure, high efficiency, durable, safe and convenient features.
The feed water to the DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to flocculate the suspended matter.
Vibrating feeder can feed block or granule materials from the material storage to charging device evenly and continuously. It can realize even feeding for crushers in sand stone production line and make rough screening for materials. Widely applied in combined operation of crushing and screening in the industries like metallurgy, mine, mine ion, building materials, chemicals, etc.
A portion of the clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called the air drum) into which compressed air is also introduced. This results in saturating the pressurized effluent water with air. 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.
The bubbles adhere to the suspended matter, causing the suspended matter to float to the surface and form a froth layer which is then removed by a skimmer. The froth-free water exits the float tank as the clarified effluent from the DAF unit. Some DAF unit designs utilize parallel plate packing material, lamellas, to provide more separation surface and therefore to enhance the separation efficiency of the unit.
DAF can be categorized by Circular (more efficient) and Rectangular (more residence time). The former type requires just 3 minutes and the example is Wockoliver DAF system, whereas Rectangular requires 20 to 30 minutes the typical example can be syskill DAF system. One of the bigger advantage of Circular is its Spiral Scoop.
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