热脱附-稳定化工序对土壤镉稳定化效率的影响

牛明芬; 陈驰; 吴波; 郭书海; 李刚; 徐丽; 闫晓峰

doi:10.13205/j.hjgc.202302022

热脱附-稳定化工序对土壤镉稳定化效率的影响

doi: 10.13205/j.hjgc.202302022

牛明芬¹,
陈驰^1,2,3,
吴波^2,3, ,,
郭书海^2,3,
李刚^2,3,
徐丽¹,
闫晓峰⁴

1. 沈阳建筑大学市政与环境工程学院, 沈阳 110168;
2. 中国科学院沈阳应用生态研究所, 沈阳 110016;
3. 污染土壤生物-物化协同修复技术国家地方联合工程实验室, 沈阳 110016;
4. 葫芦岛市生态环境服务中心, 辽宁葫芦岛 125000

基金项目:

国家重点研发计划课题"东北遗留场地重金属污染防治与安全利用技术体系构建"(2020YFC1806404)

详细信息

作者简介:
牛明芬(1967-),女,博士,教授,主要研究方向为污染控制与治理技术、固体废弃物处理。niumingfen@sina.com

通讯作者:
吴波(1982-),男,博士,研究员,主要研究方向为污染土壤修复。bowu@iae.ac.cn

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- 文章访问数: 97
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出版历程
- 收稿日期: 2021-12-26
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-02-01

INFLUENCE OF SEQUENCE OF THERMAL DESORPTION-STABILIZATION ON SOIL CADMIUM STABILIZATION EFFICIENCY

NIU Mingfen¹,
CHEN Chi^1,2,3,
WU Bo^{2,3
, ,},
GUO Shuhai^2,3,
LI Gang^2,3,
XU Li¹,
YAN Xiaofeng⁴

1. School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
2. Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
3. National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-Physicochemical Synergistic Process, Shenyang 110016, China;
4. Huludao Ecological Environment Service Center, Huludao 125000, China

摘要

摘要: 热脱附-稳定化是修复重金属-有机物复合污染土壤的主要工艺。由于热脱附对土壤重金属有"活化"和"固化"的双重作用,因此,热脱附-稳定化工序会影响重金属的稳定化效率。以含镉(Cd)的复合污染土壤为研究对象,从浸出率、形态分布、微观形貌3个层面,分析热脱附-稳定化(T-S)和稳定化-热脱附(S-T)工艺对Cd稳定化效率的影响。结果表明:S-T工艺浸出率(42.26%)低于T-S工艺(52.11%);由于Cd"活化""固化"与稳定化作用,S-T工艺处置的土壤Cd弱酸提取态和残渣态比例分别是T-S工艺的0.75,1.4倍,形态更趋于稳定分布;电镜扫描(SEM)显示,S-T工艺比T-S工艺处置后土壤颗粒结晶更为显著,说明土壤Cd的稳定化效果更好。
- 热脱附 /
- 稳定化 /
- 工艺顺序 /
- 稳定化效率 /
- 浸出率 /
- 形态分布 /
- 电镜扫描
Abstract: Thermal desorption-stabilization was the main process for repairing heavy metal-organic co-contaminated soil. Thermal desorption had the dual effect of "activation" and "solidification" on heavy metals in the soil, so the thermal desorption-stabilization sequences will affect the stabilization efficiency of heavy metals. In this study, the co-contaminated soil containing cadmium (Cd) was used as the research object to analyze the effect of thermal desorption-stabilization (T-S) and stabilization-thermal desorption (S-T) processes on Cd stabilization efficiency, from the three levels of leaching rate, morphological distribution, and micromorphology. The results showed that the leaching rate of S-T process (42.26%) was lower than that of T-S process (52.11%). Due to the activation, solidification and stabilization effect of Cd, the ratio of weak acid extraction and residue of soil Cd treated by S-T process was 0.75 and 1.4 times that of T-S process, and the morphological distribution of Cd in the soil tended to be more stable. Scanning electron microscope (SEM) showed that S-T process had more significant soil particle crystallization than T-S process, which characterizes that Cd stabilization was better.
- desorption /
- stabilization /
- process sequence /
- stabilization efficiency /
- leaching rate /
- morphological distribution /
- scanning electron microscope

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