摘要
价廉易得且无二次污染的稳定剂开发是重金属污染土壤稳定化修复的关键。以铅蓄电池污染场地Pb污染土壤（CQ土壤样品）及铅锌冶炼厂周边Pb、zn、Cd复合污染土壤（ZZ土壤样品）为研究对象，用贝壳粉进行稳定化研究，通过毒性特征浸出测试（TCI，P）评价其稳定化效果。X射线衍射（XRD）和X射线荧光光谱（XRF）等分析结果表明，贝壳粉的主要成分为CaCO。。稳定化实验结果表明：贝壳粉在2％（质量分数，下同）～10％的添加量下，CQ土壤样品中Ph的浸出浓度降低22％～62％；ZZ土壤样品中Pb、zn、cd的浸出浓度分别降低11％～91％、26％～65％、18％～64％。贝壳粉添加后土壤pH升高可能会使重金属形成氢氧化物沉淀；部分重金属可能会通过离子交换作用形成碳酸盐沉淀。经贝壳粉稳定化后土壤中重金属浸出浓度降低，有效降低了重金属的迁移性，因此贝壳粉可作为稳定剂应用于重金属污染土壤的修复。
It is important to develop cheap and environmental friendly soil stabilizer in place of conventional sta- bilizer. In this study,sea shell powder was applied as an alternative soil stabilizer for the treatment of Pb contaminated soil（CQ soil sample） and Pb Zn-Cd co-contaminated soil （ZZ soil sample）. The toxicity characteristic leaching proce- dure （TCLP） was used to evaluate the effect of stabilization. The main component of sea shell powder was CaCOa , analyzed by Xray diffraction （XRD） and X ray fluorescence （XRF）. When 2 % （mass fraction, same below）-10% sea shell powder was added, the leaching concentration of Pb in CQ soil samples decreased by 22 % -62 %, and the leaching concentrations of Pb,Zn and Cd in ZZ soil samples decreased by 11%-91% ,26%-65% and 18%-64% ,respectively. The concentrations of Pb,Zn and Cd in soil decreased significantly as a result of increased pH,forming metal hydroxides and carbonates. As a whole,sea shell powder was an appropriate heavy metal stabilizer for contaminated soil remediation.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2016年第1期14-18,共5页
Environmental Pollution & Control
基金
国家“863计划”项目(No.2013AA06A206)
关键词
贝壳粉
稳定剂
重金属
土壤
sea shell powder
stablizer
heavy metals
soil
