次氯酸钠氧化与铁盐沉淀组合处理废水中的草甘膦

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(Fe~(3+))∶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。

Combined process of sodium hypochlorite oxidation and ferric salt precipitation for treating glyphosate in wastewater

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 re-moving rate is above 99%. It is presumed that the products of glyphosate by sodium hypochlorite oxidative degrada-tion are creatin and phosphoric acid.