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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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Latest features and blogs

Schematic of intensification of AD by thermal hydrolysis, showing thickening, TH, AD and post-AD DW. Coversion of biogas be CHP engine included.

Pretty intense: the intensification of sewage sludge processes

Sludge intensification processes increase the sewage sludge solids concentration through thickening/dewatering or the biogas generation by digestion. But at what point do you stop extracting more water from the sludge or enhancing biogas production?

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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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