Abstract: An ammonium wastewater treatment technology in the production of hydrazine hydrate is introduced. The BH-type high efficiency packing was used in revamping an existing ammonium wastewater treatment system. The results indicated that organic material could be stripped from waste water at the stripping section and concentrated at the rectification section to meet the recovery requirement. The mass concentration of ammonia in the overhead reached 4%—8% and could be recovered. At the same time; the waste water could be recycled since the mass concentration of ammonia in the bottom was reduced to 20—50 mg/L，much lower than discharge standard.