METHOD OF TREATMENT OF WASTES INCLUDING THOSE CONTAINED IN SURFACE LAYERS OF SOIL Russian patent published in 1998 - IPC

FIELD: methods of treatment of wastes. SUBSTANCE: method uses arc-plasma torch for vitrification and sanitation of waste burial containing domestic garbage and contaminated soils due to pouring of toxic materials or due to burial of contaminated objects. According to first version of invention, several holes are drilled in mass of material at definite distance from one another, after which arc-plasma torch is introduced in each hole for pyrolysis, sanitation and vitrification of wastes and making the molten materials cold down and harden. In course of this process, gaseous by-products are formed; these by-products are accumulated in hood connected to scrubber and to chemical cleaning plant. Resultant gases are commercially useful gases which may be used as fuel; vitrified sediment has lesser volume as compared with volume of starting material of wastes. Contaminated soil or underground deposits are subjected to pyrolysis, molten or hardened with the aid of plasma torch which is placed in operation on bottom of vertical well having envelope, after which it is gradually raised to surface. System of wells arranged in definite order makes it possible to sanitate all mass of contaminated material. Buried objects, such as metal containers filled with contaminants and underground reservoirs- storages may be selectively sanitized directly at point of burial. EFFECT: increased effective term of burial. 16 cl, 10 dwg