Recovery apparatus for sewage treatment and sewage treatment system

The present disclosure provides an ammonia-nitrogen recovery apparatus for sewage treatment comprising a pH controller which contains ammonia-nitrogen wastewater to be treated and adjusts the ammonia-nitrogen wastewater to pH 10 to 13, a membrane distillation (MD) element which communicates with the pH controller and receives the ammonia-nitrogen wastewater to be treated by adjusting pH value to separate ammonia-nitrogen and wasted liquids, and an electro-dialysis (ED) element which communicates with the membrane distillation element and the pH controller to receive the wasted liquids discharged from the membrane distillation element and electro-dialyze the wasted liquids to recover alkaline liquids, and thereby deliver the recovered alkaline liquids to the pH controller for pH adjustment. The present disclosure further provides a sewage treatment system.