Grit chamber is the part of which of the following Sewage Treatment process?

NCERT Biotechnology XII, section 11.1.3 and Figure 11.1 explicitly place screening, the grit chamber and sedimentation within primary physical treatment. The offered Primary Treatment is therefore directly supported by the applicable Indian educational classification. EPA's finer preliminary-stage terminology is a valid presentation qualification, but does not create another offered treatment-stage answer.