Compared to conventional sedimentation, dissolved air flotation achieves what with cryptosporidium removal?

Compared to conventional sedimentation, dissolved air flotation achieves what with cryptosporidium removal?

• A. Lower removal
• B. Equal removal
• C. Higher removal
• D. Much higher removal

Answer: (D)

DAF boosts removal of small and buoyant particles by using micro-air bubbles that attach to solids and lift them to the surface for removal. Conventional sedimentation relies on gravity to settle particles, and that is less effective for very small or lightly settling organisms like Cryptosporidium oocysts, especially when they’re attached to colloids. By removing a larger fraction of these solids before filtration, dissolved air flotation achieves substantially higher removal of Cryptosporidium than conventional sedimentation, hence the “much higher removal.”

DAF boosts removal of small and buoyant particles by using micro-air bubbles that attach to solids and lift them to the surface for removal. Conventional sedimentation relies on gravity to settle particles, and that is less effective for very small or lightly settling organisms like Cryptosporidium oocysts, especially when they’re attached to colloids. By removing a larger fraction of these solids before filtration, dissolved air flotation achieves substantially higher removal of Cryptosporidium than conventional sedimentation, hence the “much higher removal.”