摘要：

采用鸟粪石法对氧化铁红厂高氨氮废水进行处理, 以pH、n(N):n(Mg)和n(N):n(P)为主要影响因素, 通过响应面法对处理过程进行了优化设计, 得到拟合程度高的二次响应曲面模型。预测的最佳实验条件:pH=9.40,n(N):n(Mg):n(P)=0.8:1:1,此条件下氨氮去除率为99.77%.通过对镁盐和磷酸盐投加量的分析得到, 当n(N):n(Mg):n(P)=0.9:1.25:1时, 出水氨氮能够达到排放标准的要求, 且出水正磷酸盐浓度较低。SEM和XRD表征结果显示, 所得沉淀物大部分为磷酸铵镁。

关键词: 响应面法, 氧化铁红, 高氨氮废水, 磷酸铵镁

Abstract:

MAP method has been used for treating the high ammonia-nitrogen wastewater from an iron oxide red factory. The three main influencing factors are as follows:pH, n(N):n(Mg)和n(N):n(P). The treatment course is optimized by response surface method(RSM), so as to obtain the quadratic response curved model with high fitting degree. Under the forecast optimum experiment conditions:pH=9.40, n(N):n(Mg):n(P) = 0.8:1:1, the removing rate of ammonia-nitrogen could be 99.77%. By analyzing the dosages of Mg2+ and PO43-, it is found that when n(N): n(Mg):n(P)=0.9:1.25:1, the effluent concentration of ammonia-nitrogen could meet the requirements for the emis- sion standard, and the concentration of orthophosphate could stay at a low level. The results of SEM and XRD chara- cterization show that the sediments obtained are mostly magnesium ammonium phosphate.

Key words: response surface method, iron oxide red, high ammonia-nitrogen wastewater, magnesium ammonium phosphate

中图分类号: 

• X703