Solid-liquid Separation

Wastewater and sludge are usually mixtures of solid components and liquids. The liquid phases almost always also contain solute substances.

Waste water, sludge, suspension Where as the solute components cannot be removed, at least not right away (see heading Adsorbents), small particles are also frequently difficult to remove to a sufficient degree.

Aggregate für die Fest-/Flüssigtrennung

This problem is addressed on the one hand by means of suitable technical equipment such as

  • Centrifuges
  • Chamber presses
  • Belt presses
  • Revolving screens and belt filters
  • Filters
  • Flotation

Funktionsweise chemischer Fest-/Flüssigtrennung

but in most cases a chemical conditioning of the medium to be dewatered is necessary to achieve more rapid and effective separation.

The chemical conditioning process functions according to the principle of the mutual attraction of particles with opposing charges. The surfaces of all solids in suspensions carry either a positive or a negative charge. The conditioning agents (usually high-molecular, i.e. polymers or coagulants) must optimize the polarized charge effect by creating a balance of charges within the system (isoelectric point).

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