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Solar dryers

Solar dryers take the form of large greenhouses into which the sludge is fed either continuously or in batches. Solar drying provides the lowest energy demand of all dryers, as low as 50 kWh/t, but incurs a large footprint due to the constraints on the available thermal energy. Although heating is provided at zero or minimal cost, energy is demanded by both the mechanical agitation of the sludge solids and deodorisation of the exhaust air. Supplementary heating, often using a waste heat source, is often needed to sustain a reasonable drying rate.

Solar dryers related videos

Solar dryer, OTEX Source: David Fang / YouTube

Solar dryer, OTEX

A video to demonstrate the principles of the OTEX solar sludge dryer.

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Solar 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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