It is experimentally established that at disintegration of organic part of sediments processes of a nitridenitrification
in parallel proceed. The induced balance in all forms of nitrogen allowed to establish the average
specific speed of removal of the total nitrogen which made 0.15 mg/g hour. Thus, at a deep
mineralization of aerobic heterotrophic denitrifying microorganisms and removal of nitrogen consumed 1 mg 8-
11 mg of the organic part fo the activated sludge. Active reaction of the environment practically remained invariable
during all experiment and made 6.0-7.3. The effect of destruction of ashless part of a sludge made 65%.
A temporary increase in the concentration of dissolved oxygen in the bottom zone of up to
2.5 mg/dm3 promoted the inhibition of the denitrification process, and as a result, increase in the concentration of
nitrates. The effect is the destruction of organic sludge was reduced to 25%.
It is noted that the ash content in the mineralization of sludge at the end of the experiment increased from 20% to
29%, with an average ash content of initial sludge 22% (Fig. 3).
Average value of an ash-content of sludge in the clarified water after flotation makes 35%.