Abstract: The high concentration ammonia nitrogen wastewater from Fushun Catalyst Plant was treated by single factor experiment and orthogonal experiment with magnesium ammonium phosphate method. The results were fitted and optimized by penalty function method and Gauss Newton method. The results of orthogonal experiments show that n(Mg)/n(N) has the greatest influence on the removal rate of ammonia nitrogen, followed by pH, while n(P)/n(N) has the least influence. The fitting curve was obtained by Gauss Newton method, and the optimal reaction conditions were determined by penalty function method: n(Mg)/n(N)=1.30,n(P)/n(N)=1.26, pH=9.59. Under the process condition, the removal rate of ammonia nitrogen is 99.79%, and the mass concentration of residual ammonia nitrogen is 28.33 mg/L, which meets the secondary standard of sewage discharge.

Key words: Nitrogen wastewater, Orthogonal experiment, Gauss Newton method, Penalty function method, Magnesium ammonium phosphate

摘要： 采用磷酸铵镁法单因素实验及正交实验处理抚顺催化剂厂的高质量浓度氨氮废水，并用罚函数法和高斯牛顿法对结果进行拟合优化。正交实验结果表明，n(Mg)/n(N)对氨氮的脱除率影响最大，其次是pH，而n(P)/n(N)影响最小；应用高斯牛顿法得出拟合曲线，再用罚函数法求出最优反应条件：n(Mg)/n(N）=1.30、n(P)/n(N)=1.26、pH=9.59。在该工艺条件下，氨氮的脱除率为99.79%，剩余氨氮质量浓度为28.33 mg/L，符合污水排放二级标准。

关键词: 高浓度氨氮废水, 正交实验, 高斯牛顿法, 罚函数法, 磷酸铵镁