For food processors, dealing with wastewater high in fats, oils, and grease is a major operational challenge. These substances can clog pipes, disrupt municipal sewer systems, and overwhelm biological treatment plants. Among various technologies, the Dissolved Air Flotation (DAF) machine has proven to be the most efficient and reliable primary treatment solution for this specific problem.
The core principle of a Dissolved Air Flotation machine is to use microfine air bubbles to separate contaminants that are too light to settle by gravity. The process begins by partially recycling treated effluent and saturating it with air under high pressure. This supersaturated stream is then injected into the main wastewater flow as it enters the flotation tank. Upon release to atmospheric pressure, countless microscopic bubbles form instantaneously.
These bubbles attach themselves to the FOG droplets and other fine suspended solids, drastically increasing their buoyancy. Within minutes, a thick, stable layer of "float" or scum forms on the surface of the tank. This layer is continuously and automatically removed by a slow-moving scraper. Meanwhile, the clarified water, now free of the majority of its FOG and suspended solids, exits from the bottom of the tank for further treatment or discharge.
The effectiveness of the Dissolved Air Flotation machine in the food industry lies in its high removal efficiency, often exceeding 95% for FOG. This not only prevents costly blockages and surcharges but also protects downstream biological systems, ensuring stable, compliant, and cost-effective wastewater management for facilities like dairy plants, slaughterhouses, and commercial kitchens.
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