亚临界水氧化技术处理草甘膦母液的应用研究

Engineering application research of subcritical water oxidation for glyphosate wastewater

以亚临界水氧化为核心,结合膜分离、蒸发结晶等技术处理草甘膦母液。与传统处理工艺相比,该工艺处理过程高效、不产生二次污染物,同时又能够回收价值副产品。某草甘膦企业以该技术处理1800 m^(3)/d的草甘膦母液,工程运行结果表明:整体工艺运行稳定,盐份均实现资源化,COD去除率达93%以上,磷回收率达99%以上,处理后废水进入生化系统最终达标排放。经核算,工程运行成本为177.3元/t,考虑磷回收价值467.2元/t,处理母液可增收289.9元/t,表明亚临界水氧化技术处理草甘膦母液具有显著的经济效益和环境效益。

Subcritical water oxidation coupled with membrane,crystallization and other technical units were used to treat glyphosate wastewater.Compared with traditional treatment processes,this new treatment process has high efficiency,produces no secondary pollutants,and recovers valuable by-products.A glyphosate enterprise used this process to treat 1800 m^(3)/d glyphosate wastewater.The operation results shows that the overall process is stable,and the salt can be recycled as a resource.The COD removal rate is over 93%,and the phosphorus recovery rate reaches 99%.The treated wastewater can enter a biochemical system to meet the relevant standards and discharged finally.The operating cost of the project is 177.3 yuan/t.Considering the phosphorus recovery value which is 467.2 yuan/t,the treatment process can increase the income by 289.9 yuan/t,which proves that treating the glyphosate wastewater with subcritical water oxidation technology has significant economic and environmental benefits.