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Dewatering processes mechanically remove a significant proportion of the sludge water content to produce a concentrated sludge product, with a dry solids concentration generally between 15 and 45%. At this concentration the product, referred to as a cake, is not free-flowing and instead forms lumps which can only be transported by a conveyor belt, mechanical earth-moving equipment, or spade.

Dewatering related videos

Belt filter press Alfa Laval Source: Alfa Laval /

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.

Dewatering features and blogs

Blog eu biosolids disposal header

Biosolids vs sewage sludge

Biosolids are usually considered to be the useful fraction of the sewage sludge. They are generally higher in solids concentration and lower in pathogen content, having gone through a stabilisation process such as chemical dosing, digestion and/or drying.

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