text: Significant developments in belt press filter technology include: cloth developments, using three belts and, the V-fold belt. Cloth developments include the double weave which incorporates different yarn types to combine the specific advantages of each. A double weave woven wire belt is also available which has a better life span and durability than a conventional wire belt.
  A belt press filter using three belts can achieve independent speeds and have different belt types for the pressure and gravity zones. This allows the filter system to accommodate higher hydraulic loadings occurring with dilute feed sludge (feed solid concentration below 1.5%).  The three belt system is more efficient with both a higher production rate and cake solid concentration at the expense of mechanical complexity.
  The V-fold belt is similar to the belt filter press with the main difference being that only a single belt, folded along the centreline is used. The technology has not been widely proven. A final dry weight solids content of 9-13% can usually be achieved; this is smaller than competing technologies. Currently this technology is suited to small-scale applications (up to approximately 3000 L of slurry per hour as the maximum belt size is 0.75 m). V-fold belts have a small footprint, low energy and wash water consumption and low capital and operating costs. They are self-tracking and can process sludge of varying composition, reducing operator involvement.