CWEA Maintenance Technologist Practice Test

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A DAFT is an acronym meaning?

  1. Dissolved Air Filtration Tank

  2. Dissolved Air Flotation Technology

  3. Dissolved Air Foaming Tank

  4. Dissolved Air Flotation Thickener

The correct answer is: Dissolved Air Filtration Tank

The term DAFT stands for Dissolved Air Flotation Technology. This technology is commonly used in water treatment processes to remove suspended solids, grease, and oils from liquids through the introduction of microbubbles which attach to the particles, causing them to float to the surface for removal. Understanding the components of this technology is crucial for wastewater treatment. It involves the dissolution of air in water under pressure, followed by the release of this pressure, which allows tiny air bubbles to form that adhere to the particles in the liquid, facilitating their rise to the surface. The other choices either misrepresent the acronym or combine elements of technology that are not standard terminologies in this field. For example, a filtration tank involves different processes compared to flotation technology, which focuses on buoyancy rather than filtration. The key element here is the flotation aspect, which is integral to the separation process utilizing dissolved air.

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