Biological nitrogen removal using the supernatant of ozonized sludge as extra carbon source

Shuo Yang, Qunhui Wang*, Tao Zhang, Peng Li, Chuanfu Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A sludge ozonation process with lab-scale anaerobic/oxic (A/O) system was used to investigate the utilization of the ozonized sludge (OS) supernatant as extra carbon source for denitrification. The optimal ozone dose for the sludge ozonation was 0.2 gO3/gSS. The concentrations of SCOD, BOD, NH3-N and TN in the supernatant increased respectively at this ozone dose. In the meantime, the sludge was significantly reduced. The OS supernatant had negative effect on nitrification because of low pH and alkalinity. After alkalinity adjustment, the A/O with the OS supernatant as the extra carbon source achieved a nitrogen removal rate of 78%, which was very close to the control experiment using glucose (79%).

Original languageEnglish (US)
Pages (from-to)410-416
Number of pages7
JournalOzone: Science and Engineering
Issue number5
StatePublished - Sep 1 2011


  • Low Carbon Source
  • Nitrogen Removal
  • Ozone
  • Sludge
  • Wastewater

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry

Cite this