DAF
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A separately identified fund or account that is maintained and operated by a non-profit organization. Once the donor makes the contribution, the organization has legal control over it.
Summary
DAF (Dissolved Air Flotation) is a water treatment process that removes suspended solids, oils, and other contaminants by dissolving air under pressure and then releasing it to create microscopic bubbles. These bubbles attach to particles, causing them to float to the surface where they can be skimmed off. It's particularly effective for removing low-density particles that don't settle well with traditional sedimentation.
Usage Context
Understanding DAF is crucial when studying physical treatment processes in water and wastewater treatment, particularly when comparing different solid-liquid separation methods and designing treatment systems for specific contaminants.
Common Confusions
- Thinking DAF works for all types of particles (it's best for low-density materials)
- Confusing DAF with air stripping (which removes volatile compounds)
- Believing bigger bubbles work better (microscopic bubbles are more effective)
- Assuming DAF replaces chemical treatment (it often works with coagulants/flocculants)
