FIELD: treatment and utilization of silt sediments of sewage water.
SUBSTANCE: silt sediments are subjected to hydraulic washing of hydrolyzed alumino-silicates at pH>12 by means of alkaline suspension at suspension-to-silt sediment ratio not exceeding 4:1; then one part of alkaline suspension is introduced in pulp obtained after hydraulic washing; this part of suspension contains additionally ash after burning of sewage water silt sediments in the amount of 3-5 mass-% or at suspension-to-silt sediment ratio of 5:1. Sludge sediment and clarified water are separated. Drainage layer may be formed on surface of sludge sediment; this layer has water-permeable membrane made from non-woven water-permeable material and weighting material which is smoothly distributed; sand or stone fines may be used for the purpose.
EFFECT: removal and simultaneous decontamination of silt sediments.
6 cl, 4 dwg, 2 tbl, 2 ex
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