Optimised method for the treatment and energetic upgrading of urban and industrial sludge purifying plants

摘要

The invention concerns an optimized method for the treatment and energetic upgrading of urban and industrial sewage sludge. It consists of a novel combination of known and tested equipment, forming a compact assembly with six functions which are: anaerobic sludge digestion (1) and biogas production, mechanical dehydration (2) up to 22-24% of dry solid, a gas turbine installation (3) burning the biogas into total energy, thermal drying (4) of the sludge up to 92% of dry solid consisting of a thin-layer dryer and a vibrated dryer/cooler with fluid bed (4b), condensation of the vapors (5) for heating the digester and the premises, and optimized energetic upgrading (6) of the dried sludge as booster fuel capable of being stored and fed into the household refuse incinerating boiler-furnaces.;The method according to the invention is also applicable to the treatment and transformation of liquid manure into granulated and bagged fertilizer.