Abstract:nitrogen in the desulfurization wastewater. The results of trial operation showed that when the influentflowrate was 95.8 m3/d,pH was 10~11 and water temperature was 35~45 ℃,the concentration of am⁃monia nitrogen in the effluent was 40.3~150.4 mg/L which met the requirements of discharge standardof wastewater from limestone-gypsum flue gas desulfurization system in fossil fuel power plants (DL/T997—2006). The removal rate of ammonia nitrogen was 90%~96.54%. The treatment cost was 14.84yuan/ton. Close-