Method for converting ammonia in a gas stream to nitrogen

A process for converting ammonia in a gas stream to nitrogen, which process comprises contacting the said gas stream with an electrolyte containing bromide and hypobromite ions to dissolve ammonia and to cause oxidation of the dissolved ammonia to produce nitrogen by oxidations with hypobromite ions, and thereafter passing the said electrolyte through an electrochemical cell containing an anode and a cathode so that hypobromite ions are regenerated by the action of the electric current flowing across the cell, wherein said current is switched on or off, according to whether the potential difference between a standard reference electrode and a sensing electrode, which is immersed in the electrolyte at the exit to the cell or an electrolyte holding tank, is greater than or less than a fixed value so that ammonium or hypobromite ions are present in only a slight excess of up to 1 millimolar and 5 millimolar respectively.