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Drying beds

Sludge drying beds provide sludge dewatering by allowing the liquid to both drain under gravity through a permeable medium on which the sludge sits, and to evaporate under ambient conditions. The sludge is spread as a thin (up to 300 mm) layer over a porous bed made up of layers of sand and gravel.

Drying beds related videos

Sludge solids separation theory Source: Judd Water & Wastewater Consultants / YouTube

Sludge solids separation theory

Sludge solids separation theory āˆ’ a brief introduction to the theories around sludge sedimentation, cake filtration and cake compression.

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Drying beds 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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