METHOD FOR ULTRA-DEHYDRATION OF THICKENED OR PASTY PRODUCTS FORMING BIOMASS AND FACILITY FOR IMPLEMENTING THE METHOD

摘要

Process for ultra-dehydration of thickened or pasty products, forming a biomass, in particular of sewage sludge, process according to which the products, in particular of dryness of 4 to 25%, are subjected to the following stages: hydrothermal carbonization type, comprising a pressurization (1,2) and a thermal conditioning (30) for a stay in a closed reactor (4); then dehydration of the products by piston press (12), obtaining a dryness greater than 50%; the product temperature upstream of the piston press dehydration being controlled by cooling at 40 ° C to 90 ° C, preferably at about 70 ° C, to optimize filterability in the piston press; the process steps being carried out in confined space to prevent the diffusion of odors into the atmosphere.