NOVELTY - Water is supplied to electrolyte-containing water contained in anode chamber and cathode chamber, and wastewater containing ammonia and/or ammonium ions is supplied to intermediate chamber. Dialysis separation of cation in wastewater is carried out to cathode chamber. Dialysis separation of anion is carried out to anode chamber. The electrolyte-containing water of the cathode chamber is electrolyzed in presence of alkali, with hydrogen gas generated from cathode. Ammonia and/or ammonium ion is vaporized as ammonia gas, and ammonia gas is recovered.    USE - For recovering ammonia from wastewater containing ammonium and ammonium ion. The recovered ammonia and hydrogen gas are supplied to a fuel cell and converted into electrical energy (claimed).    ADVANTAGE - The ammonia is economically and efficiently recovered at high recovery rate using compact installation.    DETAILED DESCRIPTION - Ion exchange tank has an anode chamber (3) having anode (2), a cathode chamber (7) having cathode (6), an intermediate chamber (4), an anion exchange membrane (5) provided between anode and intermediate chamber, and a cation exchange membrane (8) provided between cathode (6) and intermediate chamber. Water is supplied to electrolyte-containing water contained in anode chamber and cathode chamber, and wastewater containing ammonia and/or ammonium ion is supplied to intermediate chamber. Dialysis separation of cation which supplies electricity between anode and cathode, in wastewater is carried out to cathode chamber. Dialysis separation of anion is carried out to anode chamber. The electrolyte-containing water of cathode chamber is electrolyzed in presence of alkali, with hydrogen gas generated from cathode. Ammonia and/or ammonium ion is vaporized as ammonia gas, and ammonia gas is recovered.    An INDEPENDENT CLAIM is included for the utilization of the liquid recovered ammonia and hydrogen gas comprising supplying them to a fuel cell and converting them into electrical energy.    DESCRIPTION OF DRAWING(S) - The figure shows the ion exchange tank used for recovery of ammonia. (Drawing includes non-English language text)    Ion exchange tank (1)    Anode (2)    Anode chamber (3)    Intermediate chamber (4)    Anion exchange membrane (5)    Cathode (6)    Cathode chamber (7)    Cation exchange membrane (8)