| 热脱附-稳定化工序对土壤镉稳定化效率的影响 |
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| 引用本文： | 牛明芬,陈驰,吴波,郭书海,李刚,徐丽,闫晓峰.热脱附-稳定化工序对土壤镉稳定化效率的影响[J].环境工程,2023,41(2):166-172. |
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| 作者姓名： | 牛明芬 陈驰 吴波 郭书海 李刚 徐丽 闫晓峰 |
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| 作者单位： | 1. 沈阳建筑大学 市政与环境工程学院, 沈阳 110168; |
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| 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) |
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| 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。
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| 关 键 词： | 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 |
| 收稿时间： | 2021-12-26 |
INFLUENCE OF SEQUENCE OF THERMAL DESORPTION-STABILIZATION ON SOIL CADMIUM STABILIZATION EFFICIENCY |
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| Affiliation: | 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 |
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| 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. |
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