Effluent from various sections shall be drained under gravity to a screen chamber for removal of floating materials . Effluent is further taken to underground basin called equalization tank equipped with oil free air stripping/ purging system. A twin lobe blower is provided with air diffusion system for equalization for effluent in the
equalization tank. The air induced effluent is pumped to the two stage isolated reactor where in dosing of selective flocculants is imparted. The flocculated effluent is let into primary tube settler for separation of flocks.