超声辅助复合淋洗对污染黏土的工程性质影响
Impact of Ultrasound-assisted Complex Leaching on Engineering Properties of Contaminated Clay
邵俐 1倪逸斐 1王帅 1邬昉瑾 1迟琳1
作者信息
- 1. 上海理工大学环境与建筑学院,上海 200093
- 折叠
摘要
研究采用超声辅助复合淋洗剂(酒石酸、乙二胺四乙酸二钠(Na2EDTA)),对人工配制的Cu2+、Ni2+、Pb2+重金属污染黏土开展试验,分析了在不同重金属离子浓度下,超声辅助复合淋洗前后土体pH值、液塑限、强度特性、压缩特性等工程性质的变化规律.试验结果表明:(1)超声淋洗修复后,污染黏土pH值显著降低,酸性淋洗剂会带来较严重的土壤酸化;(2)修复后土体液性指数增加,塑性指数降低;(3)超声淋洗修复后,土体抗剪强度降低,内摩擦角整体降低 2°～3°;(4)孔隙比随固结压力增大而减小,重金属浓度越大,降低幅度越大;(5)修复后土体的压缩性增大,压缩系数增加,压缩模量降低.
Abstract
The ultrasonic-assisted complex leaching agents(tartaric acid and ethylenediaminetetraacetic acid disodium salt(Na2EDTA))were employed to carry out experiments on contaminated clay containing heavy metals Cu2+,Ni2+,and Pb2+.The variation laws of engineering properties such as soil pH,liquid plastic limit,strength characteristics,and compression characteristics before and after ultrasonic-assisted complex leaching were scrutinized under different heavy metal ion concentrations.The results revealed:(1)Post ultrasonic-assisted complex leaching remediation,the pH value of the contaminated clay reduces significantly,with the acidic leaching agent inducing severe soil acidification.(2)Upon remediation,the soil's liquidity index increases while the plasticity index de-creases.(3)After ultrasonic leaching remediation,the shear strength of the soil body reduces,with the overall internal friction angle de-creasing by 2°～3°.(4)The porosity ratio decreases as consolidation pressure increases,with the reduction being more substantial the higher the heavy metal concentration.(5)Post-remediation,the compressibility of the soil body increases,as does the compression coefficient,while the modulus of compressibility diminishes.
关键词
超声辅助/复合淋洗/污染黏土/工程性质Key words
ultrasonic-assisted/complex leaching/contaminated clay/engineering property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据