Leaching of CCBs: observations from over 25 years of research
Leaching of CCBs: observations from over 25 years of research
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DOI：
10.1016/j.fuel.2004.10.016
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发表时间：
2005-08-01
期刊：
影响因子：
7.4
通讯作者：
Heebink, LV
中科院分区：
文献类型：
--
作者：
Hassett, DJ;Pflughoeft-Hassett, DF;Heebink, LV
使用各种批量实验室方法对煤燃烧副产物（CCBs）进行沥滤已经在能源与环境研究中心进行了25年以上。在涉及沥滤的各种调查的早期，很明显，所提倡和使用的方法产生的数据在科学上是无效的，而且往往是误导性的。这一认识的产生是因为：1。经常使用错误的浸提溶液。方法采用浸提程序、毒性试验和。之后，毒性特征浸出程序使用了在任何条件下都不可能接触CCB的含乙酸溶液。研究发现，钙矾石等二次水化相的形成会对水溶液中以含氧阴离子形式存在的某些微量元素的浓度产生深远的影响。由于这些认识，开发了一种包括长期浸出（LTL）的方法，称为合成地下水浸出过程，该方法解决了现有方法中的许多问题。在过去25年中收集的数据将被提交，以证明需要使用适当的沥滤溶液和LTL。此外，目前使用的和拟议的方法将进行讨论，包括最近提出的美国环境保护署的新套件的浸出方法。(c)2004年由Elsevier Ltd.出版。
Leaching of coal combustion by-products (CCBs) using various batch laboratory methods has been ongoing at the Energy & Environmental Research Center for over 25 years. Early on in the various investigations involving leaching it became obvious that the methods being advocated and used were generating scientifically invalid and often misleading data. This realization came about because:1. The wrong leaching solutions were often being used. Methods such as the extraction procedure toxicity test and. later, the toxic characteristic leaching procedure used an acetic acid-containing, solution that could be unlikely to contact CCBs under any conditions.2. It was found that the formation of secondary hydrated phases such as ettringite could have a profound influence on concentrations of certain trace elements that exist as oxyanions in aqueous solution.Because of these realizations, a method that included long-term leaching (LTL) was developed called the synthetic groundwater leaching procedure, which addressed many of the problems with existing methods.Data collected over the last 25 years will be presented to demonstrate the need for the use of proper leaching Solutions and LTL. Additionally, currently utilized and proposed methods will be discussed, including the new suite of leaching methods recently proposed by the US Environmental Protection Agency. (c) 2004 Published by Elsevier Ltd.