In Beicheng Sewage Treatment Co., Ltd., Binzhou City, Shandong Province, the reporter recently saw that 8 autotrophic denitrification filters were neatly arranged, and sewage treatment facilities were operating normally. According to the data of the central control system, the total nitrogen in the inlet water is 48.68mg/L, and the total nitrogen in the outlet is 7.91mg/L.Jiang Guangzhu, general manager of Binzhou Beicheng Sewage Treatment Co., Ltd., told reporters: "We invested more than 1,200