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Flash dryers

Flash dryers are employed for industrial process slurries which have a relatively easily-removed moisture content, and are not currently applied to sewage sludge.The sludge is dried using a rising hot air stream, flowing at 20–30 m/s, to both suspend and dry the particles, and the dried product is separated using cyclones and/or bag filters. They operate at very short residence times, and so have a relatively small footprint.

Flash dryers related videos

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

Example of a flash dryer for drying slurries

Animation demonstrating the workings of the flash dryer for drying slurries, from Hosokawa Micron B.V.

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Flash 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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