Patent ID: 6978725
Filing Date: 2005-12-27
Classification: F23G,F23J,F26B,Y02E,Y02P

Abstract:
1. Process for treating biogenic residues, particularly sludges, preferably in the area of a sewage treatment plant, characterized by the following process steps: (a) Collecting biogenic residues with variable dry substance content followed by aerobic drying in a temperature range up to a maximum of 60–70° C.; (b) Maintaining the drying step until reaching a level of drying of the biogenic residues which permits energy-independent utilization; (c) Discharging with the moist stream of air only the amount of water evaporated during drying without the release of freely volatizing compounds; (d) storing the dried material in primary intermediate storage, particularly for equalization of different drying stages; (e) storing the dried material in a secondary intermediate storage as a buffer; (f) thermally treating the material in a number of successive thermal treatment steps; (g) discharging residues of the treatment from each of the thermal treatment steps; (h) Cleaning the streams of material arising during thermal treatment in primary and secondary cleaning steps, the material stream being filtered in the primary step, especially by means of dust collection, and by adsorption of the stream in the secondary cleaning step; and (i) recovering energy from all material streams brought out of the process by conducting the energy to a heat transfer medium.