Ammonia nitrogen recovery equipment, multi-stage ammonia wastewater treatment system

An ammonia nitrogen recovery apparatus includes a pH control unit for containing ammonia nitrogen wastewater to be treated and adjusting a pH value of the ammonia nitrogen wastewater to be treated to 10 to 13, a thin film distillation unit connected to the pH value control unit Unit and receives the adjusted pH value of the ammonia nitrogen waste water to be treated to separate the ammonia and the waste liquid; and an electrodialysis unit in communication with the thin film distillation unit and the pH value control unit to receive the waste liquid separated from the thin film distillation unit And electrodialyzing the waste liquid to recover a liquid base to feed the recovered liquid base to the pH control unit. The invention also discloses a multi-stage ammonia nitrogen wastewater treatment system. 本发明公开了种氨氮回收设备，其包括：pH值控制单元，容纳待处理的氨氮废水，并调整该待处理的氨氮废水的pH值至10至13；薄膜蒸馏单元，连通该pH值控制单元，并接收经调整pH值的待处理的氨氮废水，以分离氨和废液；以及电透析单元，连通该薄膜蒸馏单元和该pH值控制单元，以接收分离自该薄膜蒸馏单元的废液，并电透析该废液以回收液碱，以馈送经回收的液碱至该pH值控制单元中。本发明还公开了种多段式氨氮废水处理系统。