Biological Nitrogen Removal Using the Supernatant of Ozonized Sludge as Extra Carbon Source

Operation performance of an A/A/O process coupled with excess sludge ozonation and phosphorus recovery: A pilot-scale study

“…The effluent concentrations of chemical oxygen demand (COD) and total nitrogen (TN) could increase to some extent, whereas that of total phosphorus (TP) could increase significantly, as a result of the reduced discharge of excess sludge [14][15][16]. In addition, the organic substances released upon sludge solubilization could be used as an internal carbon source for denitrification [17,18], thus reducing wastewater treatment costs.…”