METHOD FOR ULTRA-DEHYDRATING THICKENED OR PASTY BIOMASS PRODUCTS, AND EQUIPMENT FOR IMPLEMENTING THE METHOD

摘要

The invention relates to a method for ultra-dehydrating thickened or pasty biomass products, in particular sludge from wastewater treatment plants, according to which the products, in particular products having a dryness of 4% to 25%, are subjected to the following steps: hydrothermal carbonisation treatment, including pressurization (1, 2) and thermal conditioning (30) for a duration in a closed reactor (4); followed by dehydration of the products by a ram press (12), obtaining a dryness of more than 50%; the temperature of the product upstream from the ram press dehydration being regulated by cooling between 40° C. and 90° C., advantageously to around 70° C., in order to optimise the filterability in the piston press; the steps of the method being performed in a confined space making it possible to prevent the release of smells into the atmosphere.

主权项

1. A method for ultra-dehydrating thickened or pasty products, forming a biomass, wherein the products, in particular having a dryness of 4 to 25%, are subjected to the following steps:
hydrothermal carbonization treatment, comprising a pressurization and a thermal conditioning for a residence time in a closed reactor, followed by a decompression, then dehydration of the products by a ram press, obtaining a dryness of greater than 50%, the temperature of the product upstream of the dehydration by the ram press being regulated by cooling between 40 and 90° C., advantageously at around 70° C., in order to optimize the filterability in the ram press, the steps of the method being carried out in a confined space that makes it possible to prevent the diffusion of odors into the atmosphere.