text: Denitrification is commonly used to remove nitrogen from sewage and municipal wastewater. It is also an instrumental process in constructed wetlands and riparian zones for the prevention of groundwater pollution with nitrate resulting from excessive agricultural or residential fertilizer usage.
  Wood chip bioreactors have been studied since the 2000s and are effective in removing nitrate from agricultural run off and even manure.
  Reduction under anoxic conditions can also occur through process called anaerobic ammonium oxidation (anammox):
  :NH + NO → N + 2 HO
  In some wastewater treatment plants, compounds such as methanol, ethanol, acetate, glycerin, or proprietary products are added to the wastewater to provide a carbon and electron source for denitrifying bacteria. The microbial ecology of such engineered denitrification processes is determined by the nature of the electron donor and the process operating conditions.  Denitrification processes are also used in the treatment of industrial wastewater. Many denitrifying bioreactor types and designs are available commercially for the industrial applications, including Electro-Biochemical Reactors (EBRs), membrane bioreactors (MBRs), and moving bed bioreactors (MBBRs).
  Aerobic denitrification, conducted by aerobic denitrifiers, may offer the potential to eliminate the need for separate tanks and reduce sludge yield. There are less stringent alkalinity requirements because alkalinity generated during denitrification can partly compensate for the alkalinity consumption in nitrification.