Gravabelt Gravity Belt Thickeners reduce sludge volume of biosolids and waste activated sludge and produce a pumpable concentrate for dewatering, treatment, or transport. The K-S Gravabelt uses only gravity and a porous drainage belt along with our Roto-Kone High Rate Drainage system to enhance thickening performance at a reduced operating cost.

A Gravity Belt Thickener employs gravity drainage through a filter belt to thicken polymer conditioned sludge prior to digestion, mechanical dewatering, or trucking to a land application site or disposal site.

Dilute sludge (typically 0.5% to 1.0%) is introduced at the feed end of a horizontal filter belt. As the slurry makes its way down the moving belt free water drains through the porous belt. The solids are continuously turned, encouraging the drainage of more waterSludge is discharged at the end of the horizontal filter belt as a pumpable thickened sludge.

http://www.komline.com/docs/gravity_belt_thickener.html