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Belt filter presses

A belt filter press (BFP) combines drainage and mechanical pressure sequentially, ultimately providing sludge dewatering by pressing the sludge between two revolving permeable belts to squeeze out the water from the sludge. This produces a cake (the dewatered product) having a dry solids (DS) content of 30% or more in the case of primary sludge. This is to be distinguished from the lower-energy gravity belt thickener process which achieves a maximum DS content of ~10%.

Belt filter presses related videos

Belt filter press Alfa Laval Source: Alfa Laval / YouTube

Belt filter press Alfa Laval

Animation to demonstrate the operating process of the Alfa Laval AS-H G3 belt press for sludge dewatering. This belt press can handle high volumes, and is used in both municipal and industrial wastewater treatment.

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Belt 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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