Method for recovering ammonia nitrogen in ammonia nitrogen-containing wastewater

The invention provides a method for recovering ammonia nitrogen in ammonia nitrogen-containing wastewater. The recovery method comprises the following steps: S1, adjusting the pH value of ammonia-nitrogen-containing wastewater to 10 or above, and then carrying out solid-liquid separation to obtain pretreated wastewater; s2, performing low-temperature evaporation on the pretreated wastewater to obtain first concentrated water and first condensed ammonia water; s3, performing medium-temperature concentration on the first condensed ammonia water to obtain second concentrated water and second condensed ammonia water; wherein the temperature of low-temperature evaporation is 60-95 DEG C, and the temperature of medium-temperature concentration is 100-110 DEG C. According to the method, the problem of scaling of deamination evaporation equipment is solved, ammonia nitrogen resources are effectively recycled while efficient treatment of the ammonia nitrogen wastewater is achieved, the burden of a water system is prev