ABSTRACT
U SUALLY employed after anaerobic digestion (see Figure 16. l), dewatering is the wastewater treatment unit process whereby various unit processes are employed to remove water fiom biosolids and alter their form fiom a liquid to a damp solid. An ideal dewatering operation would capture all of the biosolids at minimum cost, and the resultant dry biosolids or cake would be capable of being handled without causing unnecessary problems. Process reliability, ease of operation, and compatibility with the plant environment would also be optimum. Dewatering processes include sand drying beds, vacuum filters, centrifuges, and filter presses (belt and plate).
