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Mechanical sludge thickening to reduce sludge volume

Before sludge with a very high water content is subjected to further treatment, it makes sense and is often necessary to reduce its volume by thickening. This also increases the solids content of the sludge. If sludge with a solids content of 1% is thickened to 6% solids, this gives a volume reduction of more than 80%.

The thickening of the sludge is effected by separating sludge water; thin sludge becomes thick sludge, which is viscous but still pumpable.

HUBER Disc Thickener S-DISC
HUBER products for sludge thickening - disc thickener
HUBER Belt Thickener DrainBelt
HUBER products for sludge thickening - belt thickener
HUBER Rotary Screw Thickener S-DRUM
HUBER products for sludge thickening - screw thickener
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Sludge Volume Reduction

Excess Sludge Thickening

Sludge settles in gravity thickeners and is compressed by the weight of its own solids. Primary sludge from the primary clarifier of wastewater treatment plants and digested sludge from anaerobic sludge treatment thicken better statically than secondary sludge because of the higher density of their solids.

Secondary sludge (excess sludge) from the secondary clarifier is preferably thickened mechanically separate from the primary sludge. Polymers are mixed into the thin sludge for flocculation before the sludge is added to the thickening machine. The sludge water released by flocculation drains by gravity through a filter medium (cloth or fine screen) while flocs are retained thereon.

Mechanical excess sludge thickening is a prerequisite for the economic operation of anaerobic sludge stabilisation in a digester.

HUBER offers various machines for sludge thickening differing in design, size and throughput capacity. We offer best-performing equipment for every application.

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FAQ

Frequently Asked Questions

The following criteria can be used to assess a thickening process:

  • Throughput capacity
  • Flocculant requirement
  • Energy consumption
  • Rinsing water requirement
  • Odour and aerosol encapsulation
  • Operability
  • Automation options
  • Space requirements
  • Accessibility

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We are always open to your enquiries and want to offer you the best possible support for your projects.

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