What is Air Flotation and How Does It Work?
One of the oldest ways for removing sediments, oil & grease, and fibrous debris from wastewater is air flotation. These techniques can remove 99 percent of suspended particles and 99 percent of oil and grease. Air flotation is essentially the creation of small air bubbles that improve the natural tendency of some materials to float by transporting wastewater impurities to the tank's surface for mechanical skimming removal.
Many commercially available units are rectangular steel tank flotation systems that are delivered fully constructed and ready for simple piping and wiring on-site.For raw wastewater flows of over 1000 gallons per minute, models typically vary from 10 to over 1000 square feet of effective flotation area. Chemical treatment techniques are frequently included in whole systems. In some applications, a dissolved air flotation (DAF) system can create clean water in wash operations, with oil and grease reduction down to 2 mg/l.
Applications of DAF units
DA?F has found a home in commercial vehicle washing, industrial laundries, and food processing, in addition to municipal and heavy industry uses. Vehicle washes don't have to be limited to cars and trucks; they may also be used on buses, tank cars, and a variety of other vehicles. DAF has a sizable and diverse market.High amounts of suspended particles and metals, as well as excessive oil and grease (particularly emulsified oils), are suitable candidates for our DAF systems. Another example is an industrial laundry, where good waste treatment technologies are required. Vegetable oils, animal and seafood fats, red meat butchering, poultry processing, and kitchen and equipment washing are just a few of the applications for a DAF system.
The USEPA has placed restrictions on onshore and offshore oil drilling. It is impossible to discharge the oils from the unclean water that emerges when drilling wells. In this area, DAF technology has shown to be quite beneficial.Oily bilge water and solids containing copper and other heavy metals used in marine paints are examples of waste streams found in shipyards and onboard ships. In these cases, too, DAF is a tried and true strategy.
DAF will eliminate cadmium, chromium, lead, zinc, and other harmful heavy metals from a waste stream during metal finishing processes. Finally, DAF can be used upstream of big water treatment systems to manage contaminated water before it mingles with the rest of the waste stream when paired with other treatment techniques.
Types of air flotation
1: Pressure type floating unit
A section of the subnatant is compressed to 3 to 5 kg/cm2 and then saturated with air pressure tank in a pressure type floatation unit.
Before being released into the flotation tank, the effluent from the pressure tank is mixed with influent sludge. Excess dissolving air rushes up in the form of tiny small air bubbles once the pressure is released, attaching themselves to the sludge particles. This gives the sludge particles buoyancy and causes a sludge blanket to build on the surface, which is skimmed off and the un-recycled subnatant is returned to the wastewater treatment plant. When it comes to thickening, light sludge like activated sludge, Dissolved Air Flotation (DAF) has a number of advantages.
2: Vacuum type floatation
In a vacuum type floatation unit, air is added until the unit is saturated, then vacuum is used to release the air bubbles, which floats the solids to the surface. The sediments that have accumulated on the surface are scraped away.
How can Netsol Water help?
Netsol Water is a significant water and wastewater treatment firm in India, offering WTP, WWTP, STP, and ETP manufacture, among other services. We've made it our mission to save the planet. The company creates equipment’s and is committed to providing practical solutions that help businesses flourish. We are committed to providing our valued customers with hands-on service, expert counselling, and training.
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