磷矿开采加工过程会导致环境有害元素氟、磷的大量流失，通过渗漏、淋滤等作用污染地下水乃至整个水生生态系统，但目前国内外尚缺乏对磷矿区地下水中氟、磷复合污染原位修复技术的基础理论研究。针对这一问题，本课题拟在前期研究工作基础之上，融合稳定型纳米铁高反应活性的特点和CaO2缓慢释氧的特性，尝试开发适合于磷矿区地下水中氟、磷复合污染的原位修复技术。本研究采用批实验与模拟柱实验相结合的方法，首先制备稳定型纳米铁，对稳定剂进行筛选，优化制备参数，并考察其对氟、磷的去除效果；其次，针对地下水贫氧环境，引入CaO2为反应体系供氧，研究不同反应条件下的氧释放特性，并考察CaO2在释氧的同时，对氟、磷的去除效果；最后，将稳定型纳米铁和释氧体系进行组合，阐明组合体系对氟、磷的作用过程和作用机理，以期为稳定型纳米铁/释氧体系新技术原位修复氟、磷复合污染提供较系统的理论基础和科学依据。

Through leakage and leaching, large number of fluoride and phosphate could release to environment during the phosphate rock exploiting process, resulting in groundwater contamination. But, there is lack of basic theoretical research on the situ remediation of fluoride and phosphate in groundwater. Stable nano-iron, as a new technique, can remove kinds of pollutants in groundwater efficiently. And CaO2 can release oxygen gently. Based on the previous achievements, stable nano-iron is tested to combine with CaO2 to remove fluoride and phosphate from groundwater of phosphate rock areas in suit. Batch and column experiments were conducted in this research. Firstly, stable nano-iron is prepared. Through comparison, the excellent dispersant is selected and the preparation parameters are investigated. Otherwise, the removal efficiency for fluoride and phosphate by stable nano-iron are studied. Secondly, CaO2 is adopted to provide dissolving oxygen (DO) for groundwater environment. The oxygen release feature will be studied by considering the different CaO2 dosages and temperatures. Meanwhile, the removal efficiency for fluoride and phosphate by oxygen release system are also determined. Lastly, the combination system of stable nano-iron and CaO2 is used to remove fluoride and phosphate from groundwater. The impact factors, removal efficiency and reaction mechanism are investigated in detail. This study provides a novel technology for fluoride and phosphate removal from groundwater in suit.