METHOD OF PROCESSING OF THE REDUNDANT ACTIVE SILT CONTAINING HEAVY METALS Russian patent published in 2004 - IPC

FIELD: purification of sewage; decontamination of the redundant active silt. SUBSTANCE: the invention presents a method of processing of the redundant active silt containing heavy metals and may be used in purification of sewage, in Particular for decontamination of a redundant active silt and the stabilized sediments formed in the process of a biological purification of sewage of industrial enterprises and public and domestic economies and the sediments utilization in agriculture. The active silt and-or the stabilized sediments of the preliminary sedimentation tanks is added with 10-25 kg / m cu of a calcium-containing material and the mass is mixed using aeration within 1-4 hours. After that the phases are separated by settling and the heavy metals are extracted from the aqueous phase. The calcium-containing material is fed batchwise for 30 minutes from the beginning of aeration. After aeration the mix is exposed to treatment by ultraviolet radiation within 10-60 seconds. EFFECT: decrease of the reactants consumption, provision of conditions for the subsequent utilization of the sediments in agriculture as fertilizers. 3 cl, 1 tbl, 21 ex