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Sludge thickening

Sludge  cylindrical sedimentation tank with a galvanised metal platform and railings above it

Introduction to sludge thickening

A number of processes act purely to remove water from the sludge to reduce its volume. As a result, the suspended solids concentration of the sludge is increased, i.e. the sludge becomes consolidated.

These processes are referred to as either thickening or dewatering, depending on the amount of water removed.

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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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Gravity thickener principles (Indian School of Mines) Source: Himanshu Srivastav / YouTube

How do thickeners work?

An overview of thickeners and explanation of how they work