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Filter presses

A filter press provides sludge dewatering by pressing the sludge between a series of 20-80 porous plates, forcing water from the sludge by applying high pressures to the sludge layers. It is the only mechanical thickening or dewatering technology that is limited to batchwise (rather than continuous) operation, and can routinely achieve cake product dry solids concentrations of 35-45%.

Filter presses 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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Filter presses 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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