Chamber type filter press for de-watering sludges and similar substances

Abstract From the Canadian patent

A filter apparatus comprising a gravitional extraction section l and a high pressure section 3. In the high pressure section 3 there is a rotatable drum 35 around which a pair of filter bands 4,5 on carrier belts 6,7 are advanced with means for applying pressure to the belts to squeeze the bands and belts together to expel water from the sludge 13 through open-topped channels formed in the carrier belts. An intermediate section 2 for applying medium pressure to the sludge may be provided and the bands and belts are continuous. Various special features like cleaning different, pressure loading systems, and driving means and other modifications are described but the principle is to …