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Centrifugal dewatering increases the sludge concentration by encouraging the particles to migrate to the walls of a rapidly rotating cylindrical vessel under the influence of a centrifugal force. Relatively high rotation speeds are employed to produce a cake product having a substantially higher solids concentration than the thickened sludge product produced by centrifugal thickening.

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Solid bowl decanting centrifuge, Alfa Laval Source: Alfa Laval / YouTube

Solid bowl decanting centrifuge, Alfa Laval

Alfa Laval's decanter centrifuge for sludge thickening and dewatering in operation āˆ’ for use in wastewater treatment.

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Centrifuges features and blogs

Fig. 4.  SP filtrate and acidified sludge samples

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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