Simultaneous nitrification and denitrification by EPSs in aerobic granular sludge enhanced nitrogen removal of ammonium-nitrogen-rich wastewater

Bioresour Technol. 2016 Feb:202:101-6. doi: 10.1016/j.biortech.2015.11.088. Epub 2015 Dec 8.

Abstract

In this study, role of extracellular polymeric substances (EPSs) in enhancing nitrogen-removal from ammonium-nitrogen-rich wastewater using aerobic granular sludge (AGS) technology were analyzed. AGS enabled ammonium oxidation and denitrification to occur simultaneously. Air stripping and simultaneous nitrification-denitrification contributed to total-nitrogen removal. Clone-library analysis revealed that close relatives of Nitrosomonas eutropha and heterotrophic denitrifiers were dominant in the AGS, whereas anammox bacteria were not detected. EPSs adsorption of ammonium, nitrite, and nitrate nitrogen results in improved removal of nitrogen in batch experiments.

Keywords: Adsorbed various nitrogen forms; EPSs in aerobic granular sludge; Enhanced nitrogen removal; Simultaneous nitrification and denitrification.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aerobiosis
  • Ammonium Compounds / isolation & purification*
  • Anaerobiosis
  • Bacteria / metabolism
  • Batch Cell Culture Techniques
  • Biodegradation, Environmental
  • Biopolymers / analysis*
  • Bioreactors / microbiology
  • Denitrification*
  • Nitrification*
  • Nitrogen / isolation & purification*
  • Oxidation-Reduction
  • Particle Size
  • Sewage / chemistry*
  • Sewage / microbiology
  • Time Factors
  • Wastewater / chemistry*
  • Water Pollutants, Chemical / isolation & purification*

Substances

  • Ammonium Compounds
  • Biopolymers
  • Sewage
  • Waste Water
  • Water Pollutants, Chemical
  • Nitrogen