PRODUCT RESULTING FROM OXIDATIVE-HYDROLYTIC DESTRUCTION OF SEWAGE SEDIMENTS AND METHOD FOR PRODUCING SAME Russian patent published in 1997 - IPC

FIELD: environmental control. SUBSTANCE: proposed product represents water-soluble carboxylic acid salts. Product is obtained by proposed method, according to which sewage sediments are first converted to slurry, latter is thickened by evaporation to moisture content of 85-90% and subjected to heat treatment at 150-220 C and pressure 0.5-3.0 mPa for 10-120 minutes, slurry is maintained at 150-220 C and treated first with alkaline agent up to pH above 10 and next with oxygen-containing gas at pressure 1.5-5.0 mPa for 20-180 minutes, followed by reducing pressure down to atmospheric one. Finally, slurry is cooled down to temperature below 100 C and desired product is separated in form of organomineral complex from solid residue containing insoluble salts of heavy metals. Resulting product of oxidative-hydrolytic destruction comprises water-soluble carboxylic acids, possesses valuable properties of humus-like substances and can be extensively used in various fields of engineering and agriculture. EFFECT: effective approach for converting harmful sewage into valuable products. 2 cl, 4 tbl