METHOD OF BIOLOGICAL RECLAMATION OF CONTAMINATED LANDS IN MAPS OF SLUDGE RESERVOIRS OF CHEMICAL INDUSTRY WASTES Russian patent published in 2011 - IPC A01B79/02 B09C1/00 

FIELD: agriculture.

SUBSTANCE: invention relates to agriculture and, in particular, to biological reclamation of lands contaminated with chemical industry wastes. The method includes development of a screening layer, which is represented by wastes of chemical industry - neutralised phosphogypsum, which is dried until moisture of 25-30% for 2.5-3 months and is levelled with a slope of dried surface of not more than 1.5 degrees. Then in layers of identical thickness of 0.3-0.4 m a potentially fertile soil is applied, for instance, clayey and dry phosphogypsum-improver, mixed with cultivator, levelled and compacted to 1.35-1.40 t/m³. Then layers of fertile soil and phosphogypsum-improver are applied with the thickness taken at the ratio of 4:1, mixed with cultivator, levelled, compacted. Surface disking and harrowing are carried out. Holes are made to plant trees, where a mixture of phosphogypsum, soil and manure is added, at the ratio that ensures the required pH of the mixture.

EFFECT: invention assists in efficient utilisation of the main waste of phosphorus fertilisers production - phosphogypsum, and also in development of protective plantations on the territory of chemical industry enterprises.

1 ex