Underground Packaged STP

1. Primary Collection First stage transforms the solids in raw sewage to settled solids while allowing scum to Float on the surface. It is a primary sedimentation zone in which settled sludge is stabilized by anaerobic digestion.

2. MBBR Zone: The sewage from solid separation zone flows to the aeration zone. Air is diffused with help of air blowers which will encourage the growth of bacteria cultures in and around the Floating plastic media inside the aeration zone. The PP media provides extended surface Area for growth of microorganisms.

3. Sedimentation Zone: The next step of treatment 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 as a return sludge, to ensure that quality of effluent would pass the stipulated sewage parameters. Chlorine is offered before discharging the effluent into the Main drainage line.