METHOD FOR DISINFECTION, DECONTAMINATION AND PROCESSING OF WASTE WATER SLUDGE INTO USEFUL PRODUCTS Russian patent published in 2013 - IPC C02F11/14 B09C1/02 B09C1/08 B09B3/00 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry and agriculture to disinfect, decontaminate and restore soil fertility, production of humic fertilisers, obtaining artificial biological soil and artificial dispersed soil. The method is realised by dehydrating waste water sludge and treating the sludge with reagents. The reagents used are a composition of 0.3-8% hydrate of potassium or sodium oxide in dry form, 3-15% zinc sulphate salt and 15-30% lowland peat with respect to the weight of the obtained mixture. The obtained mixture is treated in a high-speed dissolver to obtain humic fertilisers. Before treatment with reagents, the dehydrated sludge is subjected to high-speed disintegration with impeller-type heads which are fitted with discharge electrodes of electro-plasma apparatus with voltage of 3-7 kV and discharge frequency of 0.2-2 Hz. In the preferred version, the obtained humic fertilisers are mixed with soil from stripping works, which is contaminated with heavy metals and oil-products, in ratio ranging from 1:3 to 1:10 to form artificial biological soil, which is then mixed with ground construction and demolition wastes in ratio ranging from 1:1 to 1:5 to form artificial dispersed soil.

EFFECT: method enables disinfection of waste water sludge, decontamination thereof from oil products and heavy metals, obtaining water-insoluble humic fertilisers, artificial biological soil and artificial dispersed soil.

3 cl, 3 ex