Influence of pH on the leaching behavior of a solidified arsenic contaminated soil

被引:0
|
作者
Zhang, Wenjie [1 ]
Yu, Haisheng [2 ]
Huang, Jinxiang [3 ]
Jiao, Weiguo [4 ]
机构
[1] Taizhou Univ, Coll Civil & Architectural Engn, Taizhou, Peoples R China
[2] Shanghai Construct Grp Co Ltd, Shanghai, Peoples R China
[3] Shanghai Univ, Sch Mech & Engn Sci, Shanghai, Peoples R China
[4] Guizhou Inst Technol, Dept Civil Engn, Guiyang 550003, Peoples R China
基金
中国国家自然科学基金;
关键词
Arsenic; pH; semi-dynamic leaching test; stabilization; solidification; potential mobile risk; HEAVY-METALS; FLY-ASH; CEMENT; IMMOBILIZATION; WASTE; SPECIATION; STABILIZATION; BIOACCESSIBILITY; MOBILIZATION; SOLUBILITY;
D O I
10.1080/09593330.2023.2243392
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Stabilization/solidification is widely used for treatment of arsenic (As)-contaminated soils. The stability of the soil may deteriorate significantly when exposed to acid or alkaline leachate. In this study, semi-dynamic leaching tests under different pH were carried out to investigate the leaching behavior of As from the solidified soils. Spectroscopic and microscopic analyses were performed to reveal the related mechanisms. The results showed that the leaching of As was closely correlated with the pH of the leachate, because the encapsulation effect of the cementitious matrix and the chemical speciation and valence of As were all significantly influenced by pH. In the strongly acidic leachant (pH 3.0), the leached As concentration increased by an order of magnitude, and the effective diffusion coefficient of As reached 3.71 x 10(-13) m(2)/s. This is because that pores and cracks increased owing to the acidic corrosion of CSH, such that the physical encapsulation effect was reduced and the mobility of As increased. The leachability index showed that the solidified soil was unsuitable for 'controlled utilization' under strongly acidic conditions. The leached As concentration was the lowest in the weakly alkaline leachant (pH 9.0) because under weakly alkaline conditions the hydration process of the cement was facilitated, and more CSH gels were attached to the surface of the soil particles, forming a tighter structure for As encapsulation. However, as pH increased from 9.0-11.0 the leached As concentration increased due to an increased content of As(III)-O in the solidified soil.
引用
收藏
页码:4169 / 4180
页数:12
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