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Sludge drying

Brown sewage sludge powder with coarser lumps

Sludge drying properties

Sludges of different origins and characteristics exhibit different behaviours when drying. These are most readily observed by correlating the mass water flux – the mass of water evaporated per unit surface area of solids per unit time (kg m-2 s-1) – against the moisture content of the sludge. This correlation normally reveals the three different drying phases:

  1. the adaptation/preliminary phase
  2. the constant drying rate phase, and
  3. the falling drying rate phase.
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Fig. 4.  SP filtrate and acidified sludge samples

Phosphorus recovery by sludge acidification and dewatering

A pilot-scale Danish study of phosphorus extraction from acidified anaerobic and aerobic sludge samples has revealed removal to be more effective from anaerobic sludges, even though the digested sludge alkalinity increases the total acid demand.

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Example of a flash dryer for drying slurries Source: Hosokawa Micron B.V. / YouTube

How does a flash dryer work?

Animation of the Drymeister (DMR-H) flash drying system − a flash drying system from Hosokawa Micron

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