OPTIMIZED PROCESSING AND ENERGY RECOVERY OF SLUDGE FROM URBAN AND INDUSTRIAL PURIFICATION PLANTS

摘要

The invention concerns an optimised method for the treatment and energetic upgrading of urban and industrial sludge purifying plants. 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 matter, a gas turbine installation (3) burning the biogas into "total energy", thermal drying (4) of the sludge up to 92 % of dry matter consisting of a thin-layer drier and a vibrated drier/cooler with fluid bed (4b), condensation of the vapours (5) for heating the digester and the premises, and optimised energetic upgrading (6) of the dried sludge as booster fuel capable of being stored and fed into the refuse incinerating boiler-furnaces. The method is also applicable to the treatment and transformation of liquid manure into granulated and bagged fertiliser.