铁细菌A生物修复铅铜污染土壤  

Bioremediation of soil contaminated by Pb^(2+) or Cu^(2+) using iron bacteria A

作　　者：许朝阳[1] 柏庭春 孟涛[1] 周锋[1] 吕惠[1] 庞一山 

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225009

出　　处：《河海大学学报（自然科学版）》2015年第6期569-573,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51278446)

摘　　要：为改善生物修复重金属污染土壤的方法,利用铁细菌A代谢作用形成的铁基络合物对Pb^(2+)、Cu^(2+)污染土进行生物修复。采用不同灌浆方式研究修复效果;借助扫描电镜(SEM)、X射线衍射(XRD)、傅里叶转换红外光谱(FTIR)等方法对铁基络合物的组成和结构进行分析与表征,分析重金属的沉积机理。结果表明:1次生物灌浆后有效态Pb^(2+)、Cu^(2+)含量分别减少64.6%~70.4%和47.6%~49.2%,2次灌浆后分别减少75.1%~85.5%和73.3%~78.9%;微区分析显示,铁基络合物晶形较差,但含有具有优异絮凝效能、较大比表面积的施氏矿物及碱式磷酸铁等物质。铁基络合物通过吸附和共沉作用实现了对污染环境中重金属的固定。In order to improve the method for bioremediation of soil contaminated by heavy metals,iron-based complexes produced by the metabolism of iron bacteria A were used to remediate soil contaminated by Pb^（2＋）or Cu^（2＋）. The effects of bioremediation through different grouting methods were investigated. Methods including scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）,and Fourier transform infrared spectroscopy（ FTIR） were used to identify the composition and structure of iron-based complexes and to analyze the deposition mechanism of heavy metals. Results showed that the concentrations of available Pb^（2＋）and Cu^（2＋）in soil decreased by64. 6% to 70. 4% and 47. 6% to 49. 2%,respectively,after one round of bio-grouting,and decreased by 75. 1%to 85. 5% and 73. 3% to 78. 9%,respectively,after two rounds of bio-grouting. Microscopy analyses showed that the iron-based complexes,which contained schwertmannite and Ferrum oxydatum phosphate,as well as other substances with excellent flocculation efficiency and large specific surface area,had poor crystalline form,but could fix heavy metals in a contaminated environment through adsorption and co-precipitation.

关 键 词：铁细菌A 重金属污染 Pb2+污染土 Cu2+污染土 生物修复 铁基络合物 吸附作用 共沉作用 

分 类 号：X53[环境科学与工程—环境工程]