Leaching behavior of heavy metals in solidified/stabilized fly ash under diversified leaching scenarios

被引：0

作者：

Gu K. ^{[1
]}

Wu Y. ^{[1
]}

Yin J. ^{[1
]}

Li W. ^{[1
]}

Sun Y. ^{[1
]}

Zhang Q. ^{[1
]}

Ge Y. ^{[1
]}

He Y. ^{[1
]}

Zhao L. ^{[1
]}

Wang H. ^{[1
]}

机构：

[1] Qingdao Solid Waste Pollution Control and Resource Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Shandong, Qingdao

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 11期

关键词：

acid rain corrosion; carbonation; heavy metal leaching; landfill leachate; MSW incineration fly ash; multiple extraction procedure (MEP);

D O I：

10.16085/j.issn.1000-6613.2023-0012

中图分类号：

学科分类号：

摘要：

The leaching pattern of Pb, Zn, Cu, Cd, Cr, and Ni from three typical solidified/stabilized fly ash samples under variable leaching scenarios (landfill leachate invasion + acid rain corrosion, carbonation + acid rain corrosion) was investigated using multiple extraction procedure (MEP) leaching tests. The results showed that solidified fly ash with Portland cement and stabilized fly ash with chelating agent or phosphoric acid showed different degree of resistance in short-term leaching in the face of different leaching scenarios. However, from a long-term perspective, they also failed to avoid the risk of increasing the leaching level of toxic metals due to the extension of leaching time or the change of leaching scenario, especially in the face of alternative leaching scenarios. In particular, the early leaching stage with landfill leachate or CO2-saturated water and the replacement of simulated acid rain were all unfavorable factors for increasing the leaching level of toxic metals. Moreover, the prolongation of cumulative extraction time re-increased the leaching level of most toxic metals, but the trend varied with different fly ash samples. Pb and Cd were the two toxic metals with the most frequent over their corresponding standard limits. For example, when cement solidified FA was exposed to acid rain corrosion scenarios after landfill leachate invasion and carbonation, the maximum leaching concentrations of Pb and Cd were as high as 0.36 (>0.25)mg/L and 0.28 (>0.15)mg/L, respectively. Therefore, assessing the leaching level of heavy metals according to the actual disposal scenario of fly ash is of great practical significance for characterizing the actual disposal risk of fly ash in the landfill. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：6113 / 6125

页数：12

共 43 条

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