东南大学学报（自然科学版）2016，Vol.46Issue(z1)：51-56,6.DOI:10.3969/j.issn.1001-0505.2016.S1.010
MC固化高浓度锌铅镉污染土的浸出和强度特性
Leaching and strength properties of Zn, Pb and Cd contaminated soils stabilized by MC
摘要
Abstract
To study the solidification and stabilization effect of the new binder-MC on the soil con-taminated with high level Pb, Zn and Cd, the soil pH, toxicity characteristic leaching procedure (TCLP), synthetic precipitation leaching procedure (SPLP) and unconfined compressive strength tests were carried out. The pH value, leached metal concentration and strength of stabilized soil were measured, and the relationships between these properties were also investigated. In addition, immo-bilization mechanism was also analyzed based on modified European Community Bureau of Refer-ence ( BCR) sequential extraction procedure. The results show that the pH value of stabilized soil first increases and then declines with increasing time, and ranges from 8. 93 to 9. 03 after 28 d. MC can significantly reduce leached Zn, Pb, Cd concentrations. The weak acid soluble fraction ( F1 ) contents of Zn, Pb, Cd decrease while residual fraction (F4) contents increase with increasing bind-er content. The qu increases with increasing soil pH, and is in the range of 620. 63 to 1 004. 76 kPa at day 28 and significantly higher than that of untreated soil. Strong negative correlations are ob-served between leached heavy metal concentrations and the pH values of TCLP/SPLP leachate. The heavy metal extraction ratio of F1 of BCR is significantly higher than those of TCLP/SPLP, and the differences between them increase with increasing MC content.关键词
重金属污染土/毒性浸出/无侧限抗压强度/固化稳定化Key words
heavy metal contaminated soil/leaching toxicity/unconfined compressive strength/so-lidification and stabilization分类
建筑与水利引用本文复制引用
刘松玉,夏威夷,魏明俐,陆阳,梁孝东,杜延军..MC固化高浓度锌铅镉污染土的浸出和强度特性[J].东南大学学报（自然科学版）,2016,46(z1):51-56,6.基金项目
国家自然科学基金重点资助项目(41330641)、国家高技术研究发展计划(863计划)资助项目(2013AA06A206)、国家自然科学基金资助项目(51278100,41472258)、江苏省自然科学基金资助项目(2012022) （41330641）
