地下水环境中PFOS和PFOA的迁移行为及活化过硫酸盐对其氧化降解研究

随着全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA）在水环境中的广泛检出及其毒性研究的发展，PFOS和PFOA已成为最受关注的两种代表性新兴持久性有机污染物。目前，国内外对修复地下水环境中PFOS和PFOA的系统研究仍属空白。本项目将利用批量实验、三维中型模拟含水层反应器和数值模型模拟相结合的研究方法，探究PFOS和PFOA在地下水环境中的迁移行为；研究不同条件下活化过硫酸盐释放自由基的种类、顺序及其相互转化过程；明确能够降解PFOS和PFOA的有效自由基及其释放的最佳条件，并阐明其对PFOS和PFOA的降解机理；通过三维中型模拟含水层反应器模拟评估地下水中PFOS和PFOA的修复效果，探究活化过硫酸盐降解地下水中PFOS和PFOA的原位高级氧化修复参数。本研究成果将完善活化过硫酸盐释控自由基理论，明确其降解PFOS和PFOA的机理，为PFOS和PFOA的修复应用提供技术支撑。

With the wide spread of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in water resources and the progress in their toxic studies, PFOS/PFOA have become two major emerging persistent organic pollutants. Therefore, it is very important to develop a cost-effective technology to remediate PFOS/PFOA. However, the research on the remediation of PFOS/PFOA in groundwater is very rudimentary, lack of systematic study for their effective remediation. In this study, an integrated numerical modeling and experimental approach will be utilized to investigate the fate and transport of PFOS/PFOA in groundwater. In addition, the degradation mechanism of PFOS/PFOA using activated persulfate will be investigated. In order to effectively remediate PFOS/PFOA, the releasing order of different radicals (sulfate radicals, hydroxyl radicals, and superoxide radicals), along with their interactions, will be explored. The target radicals that can effectively degrade PFOS/PFOA will be identified and activation conditions will be optimized to maximize the production of target radicals. Finally, the effectiveness of in-situ chemical oxidation of PFOS/PFOA in groundwater using activated persulfate will be evaluated in a three-dimensional intermediate-scale flow cell, providing scientific basis for the application of in-situ remediation of PFOS/PFOA in groundwater.