The paper deals with selection of mixing equipment for sludge suspensions. The concentrated sludge suspensions exhibit significant non-Newtonian flow behaviour and tend to create well mixed cavern around rotating impeller and stagnant unmixed liquid in the rest of vessel. The aim of the paper was to determine agitator speed at which all vessel content is well mixed (no stagnant zones exist) and to compare power consumption needed by different agitators to reach this state. The scale-up rule of mixing equipment was also proposed in the work.

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