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首页> 外文期刊>Environmental Science & Technology >Experimentally Altered Groundwater Inflow Remobilizes Acidity from Sediments of an Iron Rich and Acidic Lake
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Experimentally Altered Groundwater Inflow Remobilizes Acidity from Sediments of an Iron Rich and Acidic Lake

机译:实验性改变的地下水流入量使富铁和酸性湖沉积物中的酸度迁移

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摘要

To study the impact of changes in groundwater flow and chemistry on acidity export from sediments in acid mine drainage (AMD)polluted lakes,a column experiment was carried out.Schwertmannite rich sediment was subjected to three different flow rates (0,5,and 20 L m~2 a~(-1)),two percolate chemistries (1/1 mmol L~(-1)vs 10/15 mmol L~(-1)sulfate/ferrous iron,pH 5),and DOC input (approx 2.5 mmol C L~(-1)).Percolation induced acidity export in all percolated treatments (8.8-40.4 mol m~(-2)a~(-1))by accelerated proton generation from schwertmannite transformation (18.0-35.9 mol m~(-2)a~(-1))and ferrous iron release (3.8-11.6 mol m~(-2)a~(-1))from the sediment matrix.Mobilization increased with flow rate and decreased with sulfate and iron concentrations.Unspecifically bound ferrous iron contents increased within the sediment (up to 40.5 mol m~(-2)a~(-1))when iron concentrations in the percolate were high.Reduced sulfur species formed following raises in pH,but acidity consumption through this process (0.3-6.6 mol m~(-2)a~(-1))and the formation of carbonates (0.11-0.45 mol m~(-2)a~(-1))remained small.The study thus suggests that increases in groundwater inflow remobilize acidity from AMD polluted sediments.
机译:为了研究地下水流量和化学变化对酸性矿山排水(AMD)污染的湖泊中沉积物酸度输出的影响,进行了柱试验。富Schwertmannite沉积物受到三种不同流速(0、5和20)的影响。 L m〜2 a〜(-1)),两种渗滤液化学物质(1/1 mmol L〜(-1)vs 10/15 mmol L〜(-1)硫酸盐/亚铁,pH 5)和DOC输入(约2.5 mmol CL〜(-1))。通过Schwertmannite转变加速质子生成(18.0-35.9 mol m),所有渗滤处理(8.8-40.4 mol m〜(-2)a〜(-1))的渗滤诱导酸度输出。 〜(-2)a〜(-1))和亚铁从沉积物基质中释放出来(3.8-11.6 mol m〜(-2)a〜(-1))。动量随流量增加而减少,硫酸盐和铁减少当渗滤液中的铁浓度较高时,沉积物中非特异性结合的亚铁含量增加(高达40.5 mol m〜(-2)a〜(-1))。pH升高后形成的硫物种减少,但酸性消耗通过这s过程(0.3-6.6 mol m〜(-2)a〜(-1))和碳酸盐的形成(0.11-0.45 mol m〜(-2)a〜(-1))仍然很小。地下水流入量的增加使AMD污染的沉积物的酸度得以迁移。

著录项

  • 来源
    《Environmental Science & Technology》 |2006年第9期|p.2944-2950|共7页
  • 作者单位

    Limnological Research Station and Department of Hydrology,University of Bayreuth,D-95440 Bayreuth,Germany;

    Limnological Research Station and Department of Hydrology,University of Bayreuth,D-95440 Bayreuth,Germany;

  • 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 环境化学;
  • 关键词

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