QDEVU® Dissolved Air Flotation System Sewage Treatment Plant

QDEVU Air Flotation System can effectively remove the light flocs, flocculated colloidal substances, oil substances, etc. that are difficult to precipitate in wastewater,achieve the purpose of solid-liquid separation.

QDEVU Dissolved Air Flotation (DAF) System is a process to remove grease, oil and other fine suspended matter, reduce COD BOD,TSS to achieve maximum treatment efficiency in a compact footprint. It is able to remove a variety of contaminants to meet trade waste or reuse requirements. Each system is sized based on the hydraulic loading rate, Total Suspended Solids (TSS) and Fats, Oil and Greases (FOG) levels.

The DAF separates the suspended solids and lighter liquid contaminants (eg FOG and hydrocarbons) from the water by moving them to the surface of the DAF vessel and then scraping them off the surface. A pressurised stream of airsaturated water is mixed with the flocculated water and with the release of pressure, a cloud of very fine air bubbles carries the suspended solids and lighter liquids to the tank surface. Clean water overflows from the DAF tank, via an under/over-weir to sewer or to the next stage of the treatment process. The overflow level is adjustable and controls the level in the DAF flotation section. The sludge on the surface of the DAF is scraped into a sludge hopper by a mechanical scraper. The DAF system is automated via a programmable logic controller (PLC) mounted within a control cabinet on the system.

ADVANTAGE

• Large capacity,high efficency and small footprint.
• Simple structure,easy to use and maintain.
• Sludge bulking can be eliminated.
• Remove surfactants and odors in water,increse dissolved oxygen in water,provide favorable conditions for subsquent treatment.
• Good effect on low temperature,low turbidity and algae water.

APPLICATION

The aim of dissolved air flotation is to separate the fine suspended solids in water, algae, and micro-floc. And dissolved air flotation can be used in the following industries:

• Separate or recycle waste oil or grease in: oil exploration and refining, biodiesel, machining, food production and catering, and so on.
• High concentration organic wastewater treatment: paper, printing and dyeing, textile, leather, pharmaceutical, fermentation wastewater, and so on.
• Biochemical effluent liquid separation: the anaerobic effluent solid-liquid separation, aerobic (activated sludge process, contact oxidation, filter) biochemical water solid-liquid separation, the secondary settling tank Effluent treatment and so on.
• Farm and slaughterhouse wastewater treatment: cattle, pigs, chickens farm, slaughterhouse wastewater.
• Manufacturing waste: electroplating, painting, etc.
• Purification: river, landscape, recycle water, and so on.