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Paddle dryers

Paddle dryers are based on externally-heated paddles (or blades) rotating in the mass of sludge solids. There are normally either two or four sets of blades which rotate together to continuously cut into and stir the sludge solid lumps into smaller particles to continuously replenish the drying surface. Paddle dryers can operate without back-mixing since the agitation provided by the rotating paddles is sufficient to avoid the formation of sticky sludge.

Paddle dryers 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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Paddle 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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