Emulsion breaking, flotation and skimming are techniques used primarily to remove which substance?

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Multiple Choice

Emulsion breaking, flotation and skimming are techniques used primarily to remove which substance?

Explanation:
These methods are aimed at removing oils and grease from water. Emulsion breaking destabilizes oil–water mixtures so tiny oil droplets coalesce into larger droplets. Flotation uses air bubbles to lift those oil droplets to the surface, and skimming physically removes that surface layer. Oils are less dense than water and form surface films, so these techniques excel at removing them rather than dissolved ions, metals, or suspended solids. Suspended solids are typically handled by sedimentation or filtration, metals by precipitation or ion exchange, and nitrates by biological denitrification or chemical reduction.

These methods are aimed at removing oils and grease from water. Emulsion breaking destabilizes oil–water mixtures so tiny oil droplets coalesce into larger droplets. Flotation uses air bubbles to lift those oil droplets to the surface, and skimming physically removes that surface layer. Oils are less dense than water and form surface films, so these techniques excel at removing them rather than dissolved ions, metals, or suspended solids. Suspended solids are typically handled by sedimentation or filtration, metals by precipitation or ion exchange, and nitrates by biological denitrification or chemical reduction.

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