What is flotation in must clarification?

• A. Sedimentation (settling) method
• B. Flotation (bubbling gas through must; bubbles bring particles; expensive but effective and quick)
• C. Centrifugation (expensive, good for large V)
• D. Clarifying agents (pectolyc enzymes)

Answer: (B)

Flotation uses gas bubbles to lift solids out of the must. The bubbles attach to suspended particles and colloids, including pectins and debris, making them less dense so they rise to the surface as a foam that can be skimmed off. This speeds up clarification compared with waiting for natural sedimentation and is especially useful when there’s a lot of solids or a quick pre-fermentation clarifying step is needed. The trade-off is cost: it requires gas and specialized equipment, which makes it more expensive than simple settling. Other methods rely on gravity, high-speed separation, or chemical enzymes rather than lifting particles with bubbles, so flotation is the best description of this process.