中文摘要：

为了探究基于过氧化钙(CaO2)的类芬顿氧化技术(Modified Fenton,MF)修复污染地下水的可行性,本研究利用系列静态批次试验和动态模拟柱试验探讨了制备的纳米CaO2的沉降特性和在含水层中的迁移性,并分析了pH,Fe2+浓度和CaO2投加量对其降解2,4-二氯苯酚(2,4-DCP)的影响.结果表明:制备的纳米CaO2颗粒粒径在30~50nm,外包覆聚乙二醇(PEG)薄膜,在水中以稳定的胶体体系存在,悬浮性能好,不易团聚.纳米CaO2在含水层介质中具有良好的迁移性.特别是渗透性较小的细砂介质对其的阻滞作用也较弱.纳米CaO2的MF体系对2,4-DCP具有良好的降解效果:在试验条件下,当pH为5,Fe2+与2,4-DCP物质的量比为8:1,纳米CaO2与2,4-DCP物质的量比为96:1时降解效果最好.这说明纳米CaO2在场地修复中具有较好的应用前景.

英文摘要：

In order to explore the feasibility of CaO2used in Modified Fenton(MF)technology for remediation of contaminated groundwater,series static batch test and dynamic simulation column experiments were carried out to characterize the deposition and migration of nano CaO2in water and aquifer respectively.The effect of pH,Fe2+concentration and CaO2dosage on the degradation of2,4-dichlorophenol(2,4-DCP)using nano CaO2was also evaluated.The results show that the nano CaO2particles,coated with polyethylene glycol(PEG),were in the size of30~50nm.The surface modified nano CaO2particles were well dispersed in the solution,then a stable colloidal system was formed.Good migration performance was observed for nano CaO2in aquifer,even in fine sand porous media with a low permeability.2,4-DCP was effectively removed by the nano CaO2MF system.The optimal condition for the degradation of2,4-DCP in this experiment was at pH value as5,the molar ratio of Fe2+to2,4-DCP as8:1,and the molar ratio of CaO2to2,4-DCP as96:1.These results show that nano CaO2has a good application prospect in site remediation.