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Flocculant

A substance that has the property of flocculating, i.e. aggregating in flake form the particles of colloids in suspension in a solvent.

Flotation

A stage in separation (by difference in density), which consists in using gas micro-bubbles to bring solid matter suspended in water to its surface. The scum produced is then removed by raking.

Fly ash

Residues from domestic waste inicneration fume cleansing.