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首页> 外文期刊>Journal of Hazardous Materials >In-situ arsenic remediation by aquifer iron coating: Field trial in the Datong basin, China
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In-situ arsenic remediation by aquifer iron coating: Field trial in the Datong basin, China

机译：含水层铁涂层原位修复砷：中国大同盆地的现场试验

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摘要

An aquifer Fe-coating technology was evaluated for in-situ As remediation. The groundwater in the aimed aquifer has low dissolved Fe(II) concentration and high As(III) concentration, which has a low affinity toward Fe-oxides/hydroxides. To overcome these challenges, dissolved Fe(II) (5.0 mM) and NaClO (2.6 mM) were injected into the studied aquifer to promote the formation of Fe oxides/hydroxides and to oxidize As(III) into As(V), thus removing aqueous As via adsorption and/or co-precipitation. During field experiment, As concentration in groundwater from the pumping well significantly decreased. Fe and As speciation calculations indicate that incorporation of negatively charged As(V) into goethite was the probable mechanism for As removal. Both chemical sequential extraction results and spectroscopic data also support that alternating injection of Fe(II) and NaClO can achieve aquifer Fe coating and immobilize As via adsorption onto Fe oxides/hydroxides. Geochemical modelling further confirms that although competition for sorption sites between As and other dissolved species is expected in the natural groundwater system, high surface area of the Fe oxides/hydroxides can provide sufficient sites for As retention. The ability to effectively decrease As concentration of in-situ aquifer Fe-coating technology indicates that this approach should have extensive applicability to similar high As groundwater occurred worldwide. (C) 2015 Elsevier B.V. All rights reserved.
机译：对含水层铁包覆技术进行了现场砷修复的评估。目标含水层中的地下水具有较低的溶解Fe（II）浓度和较高的As（III）浓度，对Fe-氧化物/氢氧化物的亲和力较低。为了克服这些挑战，将溶解的Fe（II）（5.0 mM）和NaClO（2.6 mM）注入到研究的含水层中，以促进Fe氧化物/氢氧化物的形成并将As（III）氧化为As（V），从而去除通过吸附和/或共沉淀的水溶液在野外试验中，抽水井中地下水的砷浓度显着降低。 Fe和As形态计算表明，将带负电的As（V）掺入针铁矿是去除As的可能机理。化学序贯提取结果和光谱数据均也支持交替注入Fe（II）和NaClO可以实现含水层Fe涂层并通过吸附到Fe氧化物/氢氧化物上来固定As。地球化学模型进一步证实，尽管在天然地下水系统中预计会竞争As与其他溶解物质之间的吸附位点，但高表面积的Fe氧化物/氢氧化物可以提供足够的As保留位点。有效降低原位含水层铁包衣技术的砷浓度的能力表明，该方法应广泛适用于世界范围内发生的类似高砷地下水。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2016年第25期|19-26|共8页
  • 作者

    Xie Xianjun; Pi Kunfu; Liu Yaqing; Liu Chongxuan; Li Junxia; Zhu Yapeng; Su Chunli; Ma Teng; Wang Yanxin;

  • 作者单位

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China|Pacific NW Natl Lab, Richland, WA 99354 USA;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Arsenic; In-situ remediation; Complexation; Geochemical modelling; Iron coating;

    机译：砷原位修复络合地球化学模拟铁涂层;

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