A method is disclosed for nitrogen recovery from an ammonium including fluid and a bio-electrochemical system for the same. In an embodiment, the method includes providing an anode compartment including an anode; providing a cathode compartment including a cathode, wherein the compartments are separated by at least one ion exchange membrane; providing the ammonium comprising fluid in the anode compartment and a second fluid in the cathode compartment; applying a voltage between the anode and the cathode; and extracting nitrogen from the cathode compartment.