次氯酸钠氧化—磷酸铵镁沉淀法处理草甘膦废水并回收磷  

Treatment of glyphosate wastewater and recovery of phosphorus by sodium hypochlorite oxidation-magnesium ammonium phosphate precipitation process

作　　者：李永峰[1] 王欢[1,2] 朱利军[2] 贺子良[2] 刘锐平 

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040 [2]中国科学院生态环境研究中心饮用水科学与技术重点实验室,北京100085

出　　处：《化工环保》2017年第6期627-631,共5页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金优秀青年基金项目(51422813);中国科学院重点部署项目课题(ZDRW-ZS-2016-5-4)

摘　　要：针对草甘膦废水处理与磷回收难题,研究了次氯酸钠氧化草甘膦与磷酸铵镁沉淀法回收磷工艺的可行性。实验结果表明,次氯酸钠氧化草甘膦的最佳工艺条件为:次氯酸钠加入量109 g/L,溶液pH为9.0,氧化时间20 min。次氯酸钠氧化草甘膦的主要降解途径为:C—N键断裂生成羟基乙酸和乙酸;C—P键断裂生成磷酸(主要反应)。正交实验得到的磷酸铵镁沉淀法回收磷的最佳工艺条件为溶液pH 9.0、镁磷摩尔比1.2、氮磷摩尔比1.4、反应时间15 min,在此条件下磷酸盐回收率达99.3%。XRD图谱证实所得固体主要成分为磷酸铵镁。This study focused on difficulties in glyphosate wastewater treatment and phosphorus recovery, and investigated the process feasibility of sodium hypochlorite oxidation and magnesium ammonium phosphate precipitation. The optimum conditions for sodium hypochlorite oxidation were as follows： sodium hypochlorite oxidation amount 109 g/L, solution pH 9.0, reaction time 20 min. The degradation approach of glyphosate oxidized by sodium hypochlofite was that the C-N bond of glyphosate was broken to form glycolic acid and acetic acid, and the C-P bond of glyphosate was broken to form phosphoric acid which was the main oxidation product. The optimum conditions for magnesium ammonium phosphate precipitationobtained by orthogonal experiments were as follows： solution pH 9.0, mole ratio of Mg^2＋ to P 1.2, mole ratio of N to P 1.4, reaction time 15 min. Under these conditions, the recovery of phosphorus reached 99.3%. The main component of the solid product was confirmed as magnesium ammonium phosphate by XRD.

关 键 词：草甘膦废水 次氯酸钠 磷酸铵镁 磷回收 

分 类 号：X786[环境科学与工程—环境工程]