环糊精对疏水性有机物Aroclor1242污染土壤修复的影响因素探讨  

Influencing Factors on Aroclor1242 Contaminated Soil Remediation Using Hydroxypropyl-β-cyclodextrin(HPCD)

作　　者：刘宏 耿进强 

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215000 [2]河北地质大学管理科学与工程学院,河北石家庄050031

出　　处：《河北地质大学学报》2017年第5期20-24,共5页Journal of Hebei Geo University

基　　金：国家自然科学青年基金项目(51708381);江苏省苏州市苏州科技大学高层次人才引进科研启动基金(331711203;331711105)

摘　　要：论文通过小试实验和中试淋洗-洗脱试验,探讨了影响羟丙基-β-环糊精溶液(HPCD)对污染土壤中多氯联苯(Aroclor1242)洗脱效果的因素,并分析了各影响因素下土壤中污染物的洗脱效果,包括HPCD浓度,接触时间,洗脱次数,以及土壤有机质腐殖酸含量。研究结果表明,HPCD对土壤中的多氯联苯污染物有很好的增溶洗脱作用,5 g/L HPCD、10 g/L HPCD以及50 g/L HPCD分别比双蒸水的洗脱效果提高了13、20和77倍;HPCD对污染土壤中PCBs的洗脱可以在15 min内就达到平衡;而重复洗脱对于提高HPCD溶液对多氯联苯污染土壤的修复程度有明显的促进作用。对于浓度50 g/L的HPCD,五次洗脱比初次洗脱的洗脱率提高了25%。研究表明利用HPCD的疏水空腔,土壤中的弱极性有机污染物可以得到较好的处理效果,HPCD可望为污染土壤治理提供一种更具有广泛应用前景的新思路。The present research studied the influencing factors that might affect the PCBs contaminants soil remediation efficiency by hydroxypropyl-β-cyclodextrin（HPCD）. Through batch scale washing experiment, factors including different HPCD concentration, contact time, repeated washing times, and soil organic humid acid content were addressed and their impacts on soil washing efficiency were evaluated. Results showed that soil washing efficiency can be greatly improved by higher HPCD concentration（50 g/L）, repeated washing times（five）, short contact time（15 min）, and lower organic content or non-humic soil. On the basis of these research, it is believed that HPCD could be a promising chemical for pretreatment of hydrophobic organic compounds contaminated soil remediation.

关 键 词：羟丙基-Β-环糊精 疏水性有机物 土壤 修复 

分 类 号：X53[环境科学与工程—环境工程]