氯盐侵蚀作用对水泥固化铅污染土化学稳定性的影响

发布时间：2018-01-13 00:00

本文关键词：氯盐侵蚀作用对水泥固化铅污染土化学稳定性的影响　出处：《东南大学学报(自然科学版)》2016年S1期 　论文类型：期刊论文

【摘要】：含侵蚀性盐离子(SO_4~(2-)、Cl-等)的地下水环境可能会改变水泥固化污染土中重金属离子的溶出特性.通过毒性浸出试验模拟研究了遭受NaCl溶液侵蚀的水泥固化铅污染土的化学稳定性.试验结果表明,遭受NaCl溶液侵蚀后,随着NaCl浓度的增加,浸出液pH值略有减小,浸出液中Pb~(2+)质量浓度亦有所降低.短期浸泡,浸出液pH值最低,Pb~(2+)质量浓度最大;随后,pH值随浸泡时间增加而增大,Pb~(2+)质量浓度随浸泡时间增加而减小.当Pb~(2+)含量≤5 000 mg/kg时,浸出液中Pb~(2+)质量浓度均小于5 mg/L,满足环境要求;而Pb~(2+)含量为10 000 mg/kg的固化土体,滤出的Pb~(2+)质量浓度均超过5 mg/L,不能满足环境要求.
[Abstract]:Containing corrosive salt ions so _ 4 ~ (~ (2)). Cl- et al.). The leaching characteristics of heavy metal ions in cement-solidified contaminated soil may be changed by groundwater environment of NaCl. The chemical stability of cement-cured lead-contaminated soil corroded by NaCl solution was simulated by toxic leaching test. The test results show that. After being eroded by NaCl solution, with the increase of NaCl concentration, the pH value of the leachate decreased slightly, and the mass concentration of Pb~(2 in the leachate decreased, and the pH value of the leachate was the lowest after short-term soaking. The mass concentration of Pb~(2 was the highest. Subsequently, the pH value increased with the increase of soaking time. The mass concentration of PbPbn2) decreased with the increase of soaking time. When the content of Pb~(2) was less than 5 000 mg/kg, the pH value increased with the increase of soaking time. The concentration of Pb~(2 in the leachate was less than 5 mg / L, which met the environmental requirements. However, when the content of Pb~(2 is 10 000 mg/kg, the mass concentration of Pb~(2 is more than 5 mg / L, which can not meet the requirement of environment.
【作者单位】：合肥工业大学资源与环境工程学院;
【基金】：国家自然科学基金资助项目(41172273,41372281)
【分类号】：X505
【正文快照】： 工矿企业在冶炼、制造和使用铅制品的过程中,往往会向自然环境中排放大量含铅废水、废渣,引发严重的土壤铅污染问题[1].而固化/稳定法是处治重金属污染土最常用的修复技术之一,该方法不仅能效降低重金属离子的迁移性,还能显著提高土体强度[2].然而,在复杂的环境作用下,尤其是

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