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Disc dryers

Disc dryers operate in a manner similar to paddle dryers. A series of vertical discs or rings mounted on a single shaft within a cylindrical vessel rotate in a mass of sludge passing through the vessel. The shaft and discs are externally heated by steam or hot oil. For disc dryers, unlike paddle dryers, a proportion of the dried product sludge is often recycled to avoid the formation of the sticky phase.

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Disc dryers features and blogs

Fig. 4.  SP filtrate and acidified sludge samples
Feature

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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