The investigation of the behavior of the waste-water sludge of various chemical enterprises during thermal processing shows that effective carbon-mineral sorbents may be obtained by the pyrolysis. The conditions for the preparation of the raw material and the thermal treatment regime are regulated by the type of the reagent used for the conditioning of the sludge. The introduction of sorbents into the biological waste-water treatment system makes it possible to decrease sufficiently waste-water pollution with a simultaneous decrease in the amount of hardly oxidizable substances. The results of experiments in the biosorption regime have shown an improvement in the sedimentation properties of activated sludge and an increase in the degree of its compression.