A method of treating municipal or industrial wastewater containing undesired concentrations of ammonium or nitrate ions comprising treating the wastewater under anoxic, denitrifying conditions with denitrifying bacteria to reduce the concentration of nitrate ion and produce nitrogen gas and a denitrified...http://www.google.com.au/patents/US5651892?utm_source=gb-gplus-sharePatent US5651892 - Biodegradeable effluent nutrient removal
