Fenton氧化—镁盐沉淀法处理草甘膦废水  

Treatment of Glyphosate Wastewater by Fenton Reagent Oxidation-Magnesium Salt Precipitation Process

作　　者：黄燕梅[1] 李启辉[1] 周锡波[1] 余在华[1] 黄庆莉[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《化工环保》2007年第2期156-159,共4页Environmental Protection of Chemical Industry

基　　金：广西大学科研基金资助项目(X022095)

摘　　要：采用Fenton氧化—镁盐沉淀法处理草甘膦废水,同时得到CaCl2产品。研究了H2O2和Fe2+的加入量对Fenton氧化阶段处理效果的影响及Mg2+的加入量、沉淀终点pH和沉降时间等因素对镁盐沉淀阶段处理效果的影响。确定了Fenton氧化—镁盐沉淀法的最佳操作条件:常温常压下,用CaCO3调节废水pH约为4.0,H2O2加入量(质量分数,下同)为3%,Fe2+加入量为6%,反应时间为2h;Mg2+加入量为5%,加入石灰乳调节体系pH为11.0,静置沉降120min后分离,用HCl调节上层清液pH为7.0,浓缩,260℃下烘干得CaCl2产品。在此条件下,草甘膦废水的COD去除率达75.8%,CaCl2产率为48.5%。The glyphosate wastewater was treated by Fenton reagent oxidation -magnesium salt precipitation process and CaCl2 product was obtained simultaneously. The effects of the dosages of H2O2 and Fe^2＋ on Fenton reagent oxidation and these of Mg^2＋ dosage, final pH and settling time on magnesium salt precipitation were researched. Under normal temperature and pressure, the pH of the wastewater is adjusted to about 4.0 with CaCO3 , the dosages of H2O2 and Fe^2＋ are 3% , 6% （mass fraction, similarly hereinafter） respectively, and the reaction time is 2 h; The dosage of Mg^2＋ is 5%, the pH is adjusted to 11.0 with lime cream; After settling for 120 min, the precipitate is separated and the supernatant pH is adjusted to about 7. 0 with HCI solution, and CaCl2 product is obtained by concentration and drying at 260 ℃. The COD removal rate of glyphosate wastewater is 75.8% and the yield of CaCl2 product with high purity is 48.5 %.

关 键 词：芬顿氧化 草甘膦 氯化钙 氯化镁 废水处理 

分 类 号：X703[环境科学与工程—环境工程]