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Convective dryers

Convective (or direct) dryers are the most commonly used type of dryer for removing moisture from sewage sludge using heat. The sludge particles are in direct contact with hot gas – air or steam – which provides the heat needed to evaporate the water. They can be configured as conveyer belts (belt dyers), fluidised beds, rotating drums, or flash (pneumatic) dryers. Belt, fluidised bed, rotating drum dryers are the most often used configurations in sewage sludge drying. Since these dryers demand a significant air volume, the air is often recirculated prior to venting to conserve energy.

Convective dryers related videos

Belt dryer in use at Innsbruck WwTW in Austria, Huber Source: HUBER SE / YouTube

Belt dryer in use at Innsbruck WwTW in Austria, Huber

Huber's animation of sewage sludge drying using a belt dryer at Innsbruck wastewater treatment works.

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Convective 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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