Sludge Dewatering by Chamber Filter Presses

Mechanical dewatering is designed to separate sludge into liquid and solid part. The dewatering performance of the equipment is determined by cake dryness, solid recovery, and drying time. The operating costs, chemical usage, and required maintenance should be considered for design and operation of the dewatering equipment. The principle methods of mechanical dewatering of sludge are centrifuges and filter presses. The mechanical sludge dewatering with filter presses guarantees more efficient volume reduction. If the cake dryness rates of centrifuges and filter presses are compared, the dryness rate of filter press is two times higher on average (GlobalSpec, Dewatering equipment https://www.globalspec.com/learnmore/manufacturing_process_equipment/filtration_separation_products/dewatering_equipment. Accessed 26 June 2021, n.d.). Cake dryness of filter presses is around 40–60% and around 20–30% for centrifuges (GlobalSpec, Dewatering equipment https://www.globalspec.com/learnmore/manufacturing_process_equipment/filtration_separation_products/dewatering_equipment. Accessed 26 June 2021, n.d.). The process time of filter presses is faster than centrifuges and the operating cost as well as the capital cost of filter presses are higher than centrifuges (GlobalSpec, Dewatering equipment https://www.globalspec.com/learnmore/manufacturing_process_equipment/filtration_separation_products/dewatering_equipment. Accessed 26 June 2021, n.d.).