Arsenic pollution in the water environment is one of the important environmental problems at present. High arsenic groundwater and its resulting local arsenic poisoning have caused a great threat to human life and health. The permeable reactive barrier (PRB) is an underground in-situ remediation technology, which has the advantages of high efficiency, low energy consumption, long aging, low operating and maintenance costs. By studying the arsenic removal effects of different materials, this paper selected natural manganese ore, manganese ore granulation, loaded manganese ore and mixed manganese ore as fillers for PRB. And it conducted a simulated experiment to study the feasibility of actual PRB engineering to repair arsenic-containing groundwater. The experiment proves that the removal rate of arsenic by four manganese ore materials exceeds 90%. After examining the geographical location and hydrogeological conditions of the PRB project, the Dengjiatang area of Chenzhou City, Hunan Province was selected as the construction area. Studies show that after the completion of PRB, the arsenic content of the effluent at each monitoring point is below 10 μg/L. It indicates that all four fillers achieve the purpose of removing arsenic, and can be applied to the project according to actual needs. Finally, the safety evaluation of the PRB project was carried out. And FeCl3·6H2O was selected as the base curing material and cement was as the process auxiliary stabilizer to solidify the arsenic-containing waste residue. The arsenic concentration in the leaching solution of the arsenic slag after curing is only 1 μg/L.

中文翻译：

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锰矿渗透反应屏障修复砷污染地下水的研究与应用

水环境中的砷污染是当前重要的环境问题之一。高砷地下水及其导致的局部砷中毒对人类生命健康造成极大威胁。渗透反应屏障（PRB）是一种地下原位修复技术，具有效率高、能耗低、老化时间长、运行维护成本低等优点。通过研究不同材料的除砷效果，本文选择天然锰矿、锰矿造粒、负载锰矿和混合锰矿作为PRB的填料。并通过模拟试验研究了实际PRB工程修复含砷地下水的可行性。经实验证明，四种锰矿材料对砷的去除率均超过90%。在考察PRB项目的地理位置和水文地质条件后，选择湖南省郴州市邓家塘地区作为建设区域。研究表明，PRB完成后，各监测点出水砷含量均在10μg/L以下。表明四种填料均达到了除砷的目的，可根据实际需要应用到工程中。最后，对PRB项目进行了安全评价。选取FeCl3·6H2O为基料固化剂，水泥为工艺辅助稳定剂固化含砷废渣。固化后砷渣浸出液中砷浓度仅为1μg/L。