[en] Transient three-dimensional finite-difference numerical modeling of flow with settling solids in a 3.7 x 10³ m³ tank was performed. The number-average diameter of the particles was 15μm and nominal volumetric concentration was 24 percent. Using dilute suspension, concentration dependent viscosity, and settling velocity assumption, modeled air lift circulators were shown to be sufficient to maintain solids in suspension during normal operation. Resuspension of solids was also shown to be accomplished by impulsive circulator startup in the absence of particle agglomeration. Settling velocity was shown to be a dominant parameter under the assumptions made