Belt filter presses produce mechanical pressure on the slurry by sandwiching the sludge between two monofilament wire mesh belts which squeeze the water out of the sludge. The woven wire mesh belts within these belt filter presses are on high tension and follow a specific path along various rolls with a decreasing size of diameter. When the woven wire mesh belt passes the final pair rollers at the end of its path, the filter belts are separated where the filter cake (result of the pressed sludge) is scraped off, and ends up in a receiving container.
The belt filter press can basically be divided into three main areas:
1. The gravity dewater area where sludge is draining freely from water by means of gravity on a porous filter cloth belt/woven wire mesh belt
2. The wedge area where the remaining slurry is bought together by means of rollers and filter cloth
3. The pressure area where medium to high pressure is applied on the sludge in order to drain the solids intensively