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Dissolved air flotation, or DAF, is a water treatment process that removes suspended solids from water using air. This separation is achieved by dissolving air into water under pressure and then releasing the air at atmospheric pressure in a flotation tank. The released air forms tiny bubbles which adhere to the suspended solids in the water causing the solids to float to the surface where they can be removed by a skimming mechanism. Chemicals can be added to the feed water to improve solids removal. The DAF process can be used to clarify fresh water, processed water, and waste water so that it is suitable for use or discharge. In some cases, the solids are collected for reuse. Common applications include clarification of municipal water and waste water and process water in paper making operations.