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首页> 外文期刊>Environmental Science & Technology >Evaluating the Fate of Metals in Air Pollution Control Residues from Coal-Fired Power Plants
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Evaluating the Fate of Metals in Air Pollution Control Residues from Coal-Fired Power Plants

机译：评估燃煤电厂空气污染控制残留物中金属的命运

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摘要

Changes in emissions control at U.S. coal-fired power plants will shift metals content from the flue gas to the air pollution control (APC) residues. To determine the potential fate of metals that are captured through use of enhanced APC practices, the leaching behavior of 73 APC residues was characterized following the approach of the Leaching Environmental Assessment Framework. Materials were tested over pH conditions and liquid-solid ratios expected during management via land disposal or beneficial use. Leachate concentrations for most metals were highly variable over a range of coal rank, facility configurations, and APC residue types. Liquid-solid partitioning (equilibrium) as a function of pH showed significantly different leaching behavior for similar residue types and facility configurations. Within a facility, the leaching behavior of blended residues was shown to follow one of four characteristic patterns. Variability in metals leaching was greater than the variability in totals concentrations by several orders of magnitude, inferring that total content is not predictive of leaching behavior. The complex leaching behavior and lack of correlation to total contents indicates that release evaluation under likely field conditions is a better descriptor of environmental performance than totals content or linear partitioning approaches.
机译：美国燃煤电厂排放控制的变化将使金属含量从烟道气转移到空气污染控制（APC）残留物上。为了确定通过使用增强的APC做法捕获的金属的潜在结局，采用浸出环境评估框架的方法对73种APC残留物的浸出行为进行了表征。通过在土地处置或有益使用的管理过程中，在pH条件和预期的液固比条件下对材料进行了测试。在煤级，设施配置和APC残渣类型的范围内，大多数金属的渗滤液浓度变化很大。液-固分配（平衡）与pH的关系表明，对于相似的残留物类型和设施配置，浸出行为显着不同。在一个设施内，混合残留物的浸出行为显示为遵循四种特征模式之一。金属浸出的变异性比总浓度的变异性大几个数量级，这表明总含量不能预测浸出行为。复杂的浸出行为和与总含量的相关性缺乏表明，与总含量或线性分配方法相比，在可能的田间条件下的释放评估是环境性能的更好描述。

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  • 来源
    《Environmental Science & Technology》 |2010年第19期|p.7351-7356|共6页
  • 作者

    SUSAN A. THORNELOE; DAVID S. KOSSON; FLORENCE SANCHEZ; ANDREW C. GARRABRANTS; GREGORY HELMS;

  • 作者单位

    National Risk Management Research Laboratory, U.S.Environmental Protection Agency, Research Triangle Park,North Carolina 27711;

    rnDepartment of Civil Environmental Engineering, Vanderbilt University, Nashville,Tennessee 37235;

    rnDepartment of Civil Environmental Engineering, Vanderbilt University, Nashville,Tennessee 37235;

    rnDepartment of Civil Environmental Engineering, Vanderbilt University, Nashville,Tennessee 37235;

    rnOffice of Resource Conservation and Recovery, U.S. Environmental Protection Agency,Washington, D.C. 20460;

  • 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
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