摘要：

采用次氯酸钠氧化与铁盐沉淀组合工艺处理草甘膦模拟废水，总磷去除率大于99%，对草甘膦废水的处理有较好的应用参考价值。实验结果表明，在次氯酸钠溶液投加量为1.5 mL/L，反应pH为7，反应时间1 h的条件下，草甘膦的降解率为96.77%，无机磷的转化率为85.66%；次氯酸钠溶液氧化后再投加n（Fe³⁺）：n （P）为1.2：1的铁盐，沉淀pH为5，可将溶液中转化的无机磷及剩余的草甘膦沉淀去除，总磷去除率大于99%。推测次氯酸钠氧化降解草甘膦的产物为肌氨酸和磷酸。

关键词: 草甘膦, 次氯酸钠氧化, 铁盐沉淀, 氧化降解机理

Abstract:

The combined process of sodium hypochlorite oxidation and ferric salt precipitation has been used for treating simulated glyphosate wastewater. Its total phosphorus removing rate is higher than 99%,having pretty good application reference value to glyphosate wastewater treatment. The experimental results show that under the condi-tions below:sodium hypochlorite solution dosage is 1.5 mL/L,reaction pH is 7 and reaction time 1 h,the glyphosate degradation rate is 96.77% and inorganic phosphorus conversion rate 85.66%. After sodium hypochlorite solution has been oxidized,adding ferric salt n(Fe³⁺):n(P)=1.2:1,and precipitation pH is 5,the converted inorganic phospho-rus and the rest of glyphosate precipitation can be removed from the solution. In this case,the total phosphorus removing rate is above 99%. It is presumed that the products of glyphosate by sodium hypochlorite oxidative degradation are creatin and phosphoric acid.

Key words: glyphosate, sodium hypochlorite oxidation, ferric salt precipitation, oxidative degradation mechanism

中图分类号: 

• X703.1