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Belt dryers

Belt dryers comprise a conveyer belt which is fed with the dewatered sludge. The sludge solids are slowly transported by the belt through a stream of heated air, generally at 80-180 °C. They permit an additional element of process control to the usual parameters of sludge feeding rate and heat input, since the belt speed can be adjusted to change the dryer residence time.

Belt 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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Belt 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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