SLUDGE DEWATERING METHOD

摘要

A sludge-dewatering method which makes it possible to dewater even sludge little containing easily dewaterable components such as fibrous substance and sand to a water content of 60% or below through electro-osmotic dehydration, specifically, a method of dewatering sludge generated in the biological treatment of wastewater by the use of an electro-osmotic dehydration apparatus, wherein the sludge is conditioned by the addition of an iron inorganic coagulant and then dewatered in an electro-osmotic dehydration apparatus. The iron inorganic coagulant is preferably ferric sulfate and the amount thereof added is preferably 5 to 20wt% in terms of Fe based on the SS of the sludge.