The traditional Municipal Sewage Treatment Solution has always been based on the Activated Sludge Process, which offers high efficiency in removing organic matter (BOD) and suspended matter (TSS).
However, the eutrophication of water at discharge sites became a serious concern due to the presence of nutrients (Nitrogen and Phosphorus) in treated sewage. As a result, the NGT prescribed new discharge norms for treated sewage, requiring removal of Nitrogen (TN < 10 ppm) and Phosphorus (TP < 2 ppm).
