张俊文,马腾,冯亮,闫雅妮

• 1:中国地质大学生物地质与环境地质国家重点实验室
• 2:中国地质大学环境学院

摘要(Abstract)：

微生物活动对地下水水化学组分、氧化还原环境及砷的迁移转化有重要影响。研究高砷地下水系统的氧化还原分带性,有助于进一步理解微生物作用下地下水中砷的迁移转化规律,并为高砷地下水原位修复技术提供理论依据。在综述前人的研究成果的基础上,阐明了不同生物地球化学阶段砷的吸附、释放及固定过程,并刻画出高砷地下水系统的氧化还原分带性概念模型。在地下水环境中,微生物依次消耗(还原)溶解氧、NO-3、Fe(Ⅲ)、SO2-4和CO2等组分,氧化有机物获取能量。在溶解氧和NO-3还原阶段,地下水处于偏氧化环境,此时Fe(Ⅲ)还原受到抑制,其负载的砷不会释放到地下水中;当Fe(Ⅲ)还原时,地下水处于还原环境,会导致与之共存的砷释放,形成高砷地下水;而当SO2-4还原时,地下水处于强还原环境,产生的HS-与Fe2+形成的铁硫化物吸附或共沉淀砷,会降低地下水中的砷浓度。

关键词(KeyWords)： 砷(As);地下水;氧化还原分带性;生物地球化学

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(“863”计划)(2012AA062602);; 国家水体污染控制与治理科技重大专项(2012ZX07204-003-04);; 国家自然科学基金项目(41372252);; 国家重点基础研究发展规划“973”项目(2010CB428802);; 高等学校博士学科点专项科研基金项目(20110145110003)

作者(Author): 张俊文,马腾,冯亮,闫雅妮

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