Fe(Ⅲ)在地下砂质含水层介质中迁移行为模拟
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X523

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河南工程学院博士基金(D2016013);河南省科技攻关项目(172102310245)


Simulation on migration behavior of Fe(Ⅲ)in underground-sandy aquifer
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    摘要:

    以大同盆地某高砷地下水污染区为研究对象,通过室内动态模拟实验研究了Fe(Ⅲ)在砂质含水层中的迁移转化规律。结果表明:Fe盐在砂质含水层的迁移转化更符合速率常数逐渐增高的一级迁移反应动力学。实验开始阶段出水主要以Fe(Ⅱ)为主;实验进行到300 h左右,出水孔中Fe(Ⅱ)的浓度达到最高值;之后氧气逐渐进入砂柱内,Fe(Ⅱ)被氧化为Fe(Ⅲ)。Fe在砂质含水层介质中穿透达到平衡时,Fe离子的总吸附量为0.4 195 mol,相当于砂土的Fe离子吸附浓度为0.3 648 mol/kg;水中Fe离子浓度为3.929 mmol/L,固液分配系数为0.092 8 L/kg。沉积反应动力学的结果显示,FeCl3在砂质颗粒表面的累积沉积量为2.469 g,沉积率为50.01%,平均沉积速率为每孔隙体积数0.015 g,铁盐在含水介质中迁移过程,除对流-弥散作用外,沉积作用非常明显。

    Abstract:

    Taking a region with high arsenic polluted groundwater in Datong Basin as the research object, the migration and transformation of Fe(Ⅲ)in underground-sandy aquifer were studied through an indoor dynamic simulation experiment. The results showed that migration and transformation behaviors of Fe(Ⅲ)in underground-sandy aquifer match the first order migration reaction kinetics with a increasing rate constant. In the beginning of the experiment, Fe(Ⅱ)was the primary component in effluent, and Fe(Ⅱ)content reached to the highest value after 300 hours. Then, after the oxygen gradually entered the sand column, Fe(Ⅱ)was oxidized to Fe(Ⅲ). When the iron reached its balance in underground-sandy aquifer, the total adsorption of Fe was 0. 4195mol, which was equivalent to the adsorption concentration of Fe ions by sand was0. 3648 mol/kg. The Fe ion concentration in water was 3. 929 mmol/L, and the value of Kd was 0. 0928 L/kg. Deposition reaction kinetics results showed that the cumulative deposition of FeCl3 in sand was 2. 469 g, and the deposition rate was 50. 01%. The average deposition rate was 0. 015 g per number of pore volume. During the transformation of iron in underground-sandy aquifer, the sedimentation was very obvious besides the convection-dispersion effect.

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邓天天,马培,李晗晟,等. Fe(Ⅲ)在地下砂质含水层介质中迁移行为模拟[J].水资源保护,2018,34(3):75-79.(DENG Tiantian, MA Pei, LI Hansheng, et al. Simulation on migration behavior of Fe(Ⅲ)in underground-sandy aquifer[J]. Water Resources Protection,2018,34(3):75-79.(in Chinese))

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  • 收稿日期:2017-03-15
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  • 在线发布日期: 2018-05-25
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