次氯酸钠氧化与铁盐沉淀组合处理废水中的草甘膦

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

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。

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 conditions 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 phosphorus 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.