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Drying

In sludge drying the moisture from sludge is removed as water vapour by heating, rather than being removed as a liquid via mechanical means such as in thickening or dewatering. The sludge is normally dried to solid concentrations above 65% to produce pellets or, at the highest solids concentrations of 90% or more, a powder. Pelleted or powdered sludge is more readily conveyed than the dewatered sludge of higher water content, which exists as large lumps.

Drying related videos

Paddle dryer for sludge treatment Source: Klooth Alex / YouTube

Paddle dryer for sludge treatment

A video to demonstrate a paddle dryer for sludge in operation.

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Drying features and blogs

Blog sludge worth shutterstock 16047946
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?

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