A belt filter press is a bio-solids
Sludge dewatering device that applies mechanical pressure to a chemically conditioned slurry, which is sandwiched between two tensioned belts, by passing those belts through a serpentine of decreasing diameter rolls. The machine can actually be divided into three zones: Gravity zone, where free draining water is drained by gravity through a porous belt; Wedge zone, where the solids are prepared for pressure application; And pressure zone, where medium, then high pressure is applied to the conditioned solids.