METHOD OF COMPOSTING OF SEWAGE WATER SLUDGES Russian patent published in 2000 - IPC

FIELD: agriculture; applicable in preparation of fertilizers from sewage sludges polluted with heavy metals. SUBSTANCE: sewage water sludges are mixed with additives of high moisture capacity and gas absorption and obtained mixture is formed into compost heap round perforated pipeline. Static aerated heap is coated from top and sides with layer of additives providing oxidizing conditions. Arranged in heap base is layer of additives producing reducing conditions. Located under heap base are filtering and watertight layers. Heap inside is periodically blown with air from perforated pipeline. Method provides for reduction of compost toxicity with preserved material capacity, Acceleration of compost aging due to preliminary heating of compost mixture and obtaining heavy metals concentrate by localization and evaporation of settled metal-bearing compounds. EFFECT: higher efficiency. 3 cl, 1 dwg