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Sludge treatment − conductive sludge dryers
Conductive drying indirectly heats sludge by bringing the sludge particles into contact with an externally-heated surface
Sludge drying
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:
- the adaptation/preliminary phase
- the constant drying rate phase, and
- the falling drying rate phase.
More on sludge drying
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Introduction to sludge drying
Processes where moisture is removed from sludge as water vapour are known as 'sludge drying'
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Sludge treatment − sludge drying operation
Sludge drying processes operate at solids temperatures of 60-93 °C to encourage water to evaporate and leave a solid residue
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Sludge treatment − sludge dryer configurations
Sludge drying processes are generally configured as convective, conductive, or as solar dryers
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Sludge treatment − solar dryers
Solar dryers make use of renewable solar energy to dry sludge and need a larger footprint to allow for increased drying times
Latest features and blogs
Blog
How much is sludge worth?
The UK regulator OFWAT has introduced legislation based on the notion of sludge as a resource. Its value is often expressed in terms of calorific content, and the phosphate is also potentially recoverable. But how exactly should sludge value be quantified? Read article
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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