• Introduction

  • Object of Preliminary Treatment

  • Screens

  • Grit Removal

  • Sedimentation Tanks

  • Purpose of Sedimentation Tanks

  • Nature of Sewage

  • Tank Geometry, Capacity and Efficiency

  • Inlet and Outlet Design

  • Sludge Removal

  • Scum Removal

  • Sedimentation Tank Design

  • Improved Design

  • Conclusions

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