Operation Process1. Solid Separation Zone:First stage transforms the effluent solids to settled solids while allowing scum tofloat on the surface; it is a primary sedimentation zone in which settled sludge is stabilized by anaerobic digestion.The treatment efficiency of the chamber is in the range of 30% BOD removal. Aeration Zone:Second stage is the aerobic zone along with fab media inside the tank which in turn increases the surface area and retains microorganisms long enough to digest the organic substance. clear water overflows to the next treatment chamber. Air is provided through blowers and higher contacting time with the slime on the fab media facilitates efficient digestion. bod removal is around 60%Final sedimentation Zone:Final stage involves the sedimentation where organic wastes are settled in the sedimentation zone. the settled waste in the bottom of the tank is pumped back to the solid separation zone as a return sludge having active biomass MLSS to increase the efficiency of the system and to ensure that the effluent quality meets the stipulated PCB standards.