An advantage of gravity settling over pressure flotation is that it requires less what?

• A. Lower energy
• B. Less equipment
• C. Faster operation
• D. Easier maintenance

Answer: (B)

Gravity settling works by letting dense particles gradually fall out of suspension under the pull of gravity in a clarifier, so the system relies on relatively simple, stationary hardware. Because there’s no need to generate air bubbles, mix vigorously, or circulate large volumes with specialized flotation equipment, the overall equipment footprint is smaller. In contrast, pressure flotation requires additional components such as an air supply system, diffusers or flotation cells, mixers, chemical dosing equipment, skimmers, and related controls. That combination adds to capital cost and maintenance needs. So the clear advantage is needing less equipment. Other aspects like energy use, speed, or maintenance aren’t as universally simplified and depend on specific designs, making equipment count the strongest differentiator.