METHOD OF DETOXIFYING MUD, IN PARTICULAR SEA AND LAGOON SEDIMENTS, OR GROUNDS CONTAINING ORGANIC AND/OR INORGANIC TRACE POLLUTANTS Russian patent published in 2005 - IPC

FIELD: environmental pollution control.

SUBSTANCE: invention relates to industrial process of detoxifying sea and lagoon sediments or grounds polluted by stable organic trace pollutants (e.g., dioxins and furans, polychlorobiphenyls, aromatic polycyclic hydrocarbons) and inorganic trace pollutants (e.g., Hg, Cr, Cu, Zn, Pb, As, Cd, etc.). Detoxification process comprises following stages: (i) thermal desorption of organic pollutants in trace amounts from mud or ground and removal of volatile metals from furnace operated at 300 to 700єC to form first gaseous stream containing removed organic pollutants and volatile metals and stream consisting of remaining solids; and (ii) extracting heavy metals from the stream of remaining solids with the aid of inorganic acids or chelating compounds, in one or more steps, to produce chemically dissolved above-indicated heavy metals and essentially detoxified mud or ground having characteristics allowing thus treated mud or ground to be returned to their original place.

EFFECT: achieved complete detoxification with minimum environmental harm.

16 cl, 1 dwg, 3 tbl, 2 ex