Study of Pollutant Removal in Activated Sludge Process Using Lab Scale Plant by Intermittent Aeration

The present study was aimed at studying the removal of carboneous and nutrient pollutant from wastewater by intermittently aerating the lab scale activated sludge process. The process was conducted for varying cycle time and aeration fraction with same HRT, SRT and MLSS. The study found that the removal of COD, TKN and TP increases with increasing cycle time. COD and TKN removal decreasing with increasing non-aeration time whereas, TP removal increased with increasing non aeration time. However filamentous growth was observed with increasing non-aeration time. It can be concluded that intermittent aeration can be a good alternative for nutrient removal. By intermittently aerating the system, energy cost for aeration can also be cut-off.