The left side section view of the gravity thickness tank section drawing is given in this model. Gravity thickening involves using specially designed circular tanks that concentrate thin sludges to a more-dense sludge product. The limitation of this form of clarification water treatment is that it works mostly for the excess watery sludge derived from an activated-sludge process. The limitation of this form of clarification water treatment is that it works mostly for the excess watery sludge derived from an activated-sludge process. For more details download the AutoCAD drawing file from our website.