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Wastewater - Solids Management: Dewatering

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Michigan Environmental Education Curriculum
Wastewater Treatment

Belt Press There are several different ways to remove water from sludge. One of these is called a belt filter press. Sludge is placed between two cloth belt filters that pass over a series of drums or rollers squeezing out the liquid. At the end of the press, a knife scrapes the sludge cake off of the belt filter. Liquid removed during pressing is returned to the beginning of the plant for further treatment. The sludge cake is then sent on for final disposal.

Left: Belt Press

Sludge is pumped to the belt press (brown pipe in figure above) and is delivered at the top where it is spread evenly across cloth belts by black rubber dividers (figure below).

Sludge then passes between cloth belts, squeezing water out which is returned to the beginning of the plant for further treatment.

The dewatered sludge "cake" passes over a knife edge, separating the sludge from the cloth belt and delivering through a passage (blue) to a waiting truck below.

Top of Belt Press Belt on Belt Press Belt Press Exit
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