Ammonia stripping device, and resource recovery type high concentration wastewater treatment system using the same

A method of recovering ammonia from wastewater, the method comprising:

• pretreating the wastewater to obtain raw water comprising an ammonia mixed gas;
• passing the raw water comprising the ammonia mixed gas to a decompression reactor to obtain a stream comprising stripped ammonia mixed gas wherein the decompression reactor is under a controlled pressure of about 0.5 to 2 bar gauge, a pH of about 9.5 to 10, a reaction temperature of about 20° C. to about 35° C., and consecutive operations of a pump;
• passing the stream comprising the stripped ammonia mixed gas through a heat exchanger to condense water wherein the heat exchanger has a heat-radiating path and is connected to a cooler that supplies water to the heat-radiating path to maintain a fixed temperature of the heat exchanger, passing the stripped ammonia mixed gas through a trap to recover condensed water, and then passing the stripped ammonia mixed gas to a stripped ammonia mixed gas collector;
• and
• passing the stripped ammonia mixed gas from the stripped ammonia mixed gas collector to a convection oven comprising a polymeric gas separation membrane wherein ammonia gas is selectively permeated, and the ammonia gas is passed through pressure adjustment, flow measurement and ingredients analysis steps to recover the ammonia gas having a purity of 99%.