Dissolved Air Flotation (DAF) is becoming the choice for trade waste water treatment due to its ease of use and high performance. DAF is a proven and effective filtration system used for treating wastewater across a variety of industrial and municipal processes. Many industries still use grease arrestors that prove to be inadequate pre-treatment for activities with discharges that have high oil and grease, or suspended solids (SS) concentrations like food manufacturing companies, food courts, shopping complexes and any place where periodic caustic discharges inhibit simple gravity separation. The Enviro Concepts DAFs are engineered to efficiently remove suspended solids, fats and oils, BOD, COD, and heavy metals from a wide variety of trade waste water sources. Due to its high efficiency, the treated water becomes suitable for low cost discharge. It can also be taken further into a recycling process so that the water can be made ready for reuse.
Why Do I Need A Dissolved Air Flotation System?
Any industrial site that has multiple trade waste activities, a need for high volume wastewater treatment with substantial grease arresting capabilities, a Dissolved Air Flotation (DAF) unit will be required to treat the trade waste high in grease, solid waste and BOD. In fact, DAF is the best practice trade waste management option.
For any site where there is a possibility of multiple trade waste activities choking the sewer or having any negative impacts on the downstream sewer due to the site’s discharge and compliance, pre-treatment devices like the DAF is a practical option. The DAF is widely used in treating wastewater in various industries like vehicle and truck wash stations, transport container wash down facilities, heavy equipment and machinery wash downs, oil refineries, petrochemical and chemical plants, natural gas processing plants, general water treatment, food processing, meat and fish processing, abbattoirs, dairies and even tanneries.
The Heart of the Dissolved Air Flotation (DAF) System
At the heart of the Dissolved Air Flotation (DAF) is the mixing tank performing the air dissolution process that is fundamental to its high performance. In the Air Water Contact Mixing Tank, air bubbles are generated when a recycled stream of treated effluent is taken from the discharge end of the DAF and pressurized. This pressurized flow is introduced into the mixing tank and air is added and gets dissolved into the recycle stream. The pressure is then released, allowing the precipitation of the microscopic bubbles in the vessel. The water looks like milk.
The fine micro bubbles of air are generated in the DAF vessel and combines with the insoluble contaminants in the wastewater, lifting them to the surface. Mechanical scrapers remove the floating sludge layer and the purified wastewater discharges to sewer.