Leaching Characteristics of Arsenic from Aged Alkaline Coal Fly Ash Using Column and Sequential Batch Leaching
Leaching Characteristics of Arsenic from Aged Alkaline Coal Fly Ash Using Column and Sequential Batch Leaching
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DOI：
10.1021/ie100909n
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发表时间：
2011-01
影响因子：
4.2
通讯作者：
A. Khodadoust;P. Naithani;T. Theis;I. Murarka
中科院分区：
文献类型：
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作者：
A. Khodadoust;P. Naithani;T. Theis;I. Murarka
由于可能污染地下水，煤飞灰处理设施中的灰中砷的浸出引起人们的关注。进行了连续批式和柱式浸出实验，以确定从燃煤电厂附近退役灰蓄水池发现的灰中砷的浸出情况。本研究评估了老化碱性煤粉煤灰中砷的浸出特性，作为灰特性和灰深度的函数。浸出 14 天（7 个阶段）后，柱浸（10.5%）和连续分批浸出（11.1%）中砷从灰中浸出的水平相当，而在浸出 42 天（21 个阶段）后，柱浸的砷浸出量（17.8%）低于顺序浸出（22.0%）。柱浸和序批浸出砷的浸出特性相似，一半以上的砷浸出发生在浸出的14 d内，最大的砷浸出发生在浸出的第二和第三阶段。
Leaching of arsenic from ash in coal fly ash disposal facilities is a cause for concern due to possible contamination of groundwater. Sequential batch and column leaching experiments were carried out to determine the leaching of arsenic from ash found at a retired ash impoundment basin near a coal-fired power plant. This study assessed the leaching characteristics of arsenic from aged alkaline coal fly ash as a function of ash properties and ash depth. Comparable levels of arsenic leached from the ash in column leaching (10.5%) and sequential batch leaching (11.1%) after 14 days (7 stages) of leaching, while less arsenic (17.8%) leached for column leaching than for sequential leaching (22.0%) after 42 days (21 stages) of leaching. The leaching characteristics of arsenic in column leaching and sequential batch leaching were similar, where more than half of the leaching of arsenic occurred within 14 days of leaching with the maximum leaching of arsenic occurring during the second and third stages of leachin...