The efficacy of pH-dependent leaching tests to provide a reasonable estimate of post-carbonation leaching

被引：40

作者：

Ai, Haiping ^{[1
]}

Clavier, Kyle A. ^{[1
]}

Watts, Benjamin E. ^{[2
]}

Gale, S. Adrian ^{[1
]}

Townsend, Timothy G. ^{[1
]}

机构：

[1] Univ Florida, Dept Environm Engn Sci, POB 116450, Gainesville, FL 32611 USA

[2] Univ Florida, Dept Civil & Coastal Engn, POB 116580, Gainesville, FL 32611 USA

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2019年 / 373卷

关键词：

Leaching; Bottom ash; Concrete; Carbonation; pH; MSWI BOTTOM ASH; ACCELERATED CARBONATION; TRACE-ELEMENTS; STABILIZATION; ETTRINGITE; ANTIMONY; RELEASE; COPPER; SOILS;

D O I：

10.1016/j.jhazmat.2019.03.089

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

pH is a vital factor related to the heavy metal leaching from wastes. Over time, waste materials may be naturally weathered in the presence of water and carbon dioxide, reducing their pH and altering their mineralogy. Here we evaluate whether conducting a pH-dependent leaching test on wastes expected to carbonate sufficiently reflects the leaching of these wastes upon carbonation. Certain elements, such as Al and Sb, exhibited different leaching trends for carbonated and un-carbonated samples of two different waste materials. XRD results observed different mineral phases as a result of carbonation in incineration bottom ash. The application of pH-dependent leaching tests on fresh waste samples (at neutral pH values) were found to potentially mischaracterize leaching from carbonated waste samples at similar pH values for some elements and waste materials.

引用

页码：204 / 211

页数：8

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