| We have treated many of this type of plant with great success in reducing the BOD’s, COD’s, suspended solids, oils grease and fats, sludge and balance the pH. The best results are the reduction of sludge by 40% to 60%. Prior to the above DAF there is usually a large holding tank, which is were we dose the product. Illustrated above is a typical DAF plant.
DAF stands for Dissolved Air Floatation
Dissolved Air Floatation and How it Works
A coagulant added to the raw water precipitates dissolved contaminants and encourages particles to form "floccs". Gentle agitation in the flocculator encourages these to grow before they pass into the flotation zone. Here, microscopic air bubbles are injected which rapidly float the floccs to the surface. The accumulated float is skimmed off. Clarified water passes to the filter for final polishing and the filter is periodically cleaned by water or air/water back washing. The 50 micron bubbles used for flotation are formed by recycling a small stream of filtered water through an air pressuriseded, packed tower saturator to specially designed nozzles at the DAF cell inlet. Here, a rapid pressure drop causes the air to come out of solution and the generation of millions of small bubbles.
Another graphic of a Dissolved Air Floatation system
Plants will differ from company to company but the basic principle is the same.
The whole point of this is to give an idea of were Enzymatic can help as mentioned above.
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