镁渣对污染土壤中Cd、Pb的稳定化效果研究  

Stabilizing effect of magnesium slag on Cd and Pb in polluted soil

作　　者：王金航 刘家豪 谭笑[1] 张傑[1] 魏文侠 王斌[3] 李曙光 林爱军[1,3] WANG JinHang;LIU JiaHao;TAN Xiao;ZHANG Jie;WEI WenXia;WANG Bin;LI ShuGuang;LIN AiJun(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029;Beijing Key Laboratory of Industrial Land Contamination and Remediation,Environmental Protection Research Institute of Light Industry,Beijing 100089;Qinhuangdao Bohai Biological Research Institute of Beijing University of Chemical Technology,Beijing University of Chemical Technology,Qinhuangdao 066000;Qinhuangdao Jingke Environmental Protection Equipment Co.,Ltd,Qinhuangdao 066004,China)

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]轻工业环境保护研究所工业场地污染与修复北京市重点实验室,北京100089 [3]北京化工大学秦皇岛环渤海生物产业研究院,秦皇岛066000 [4]秦皇岛晶科环保设备有限公司,秦皇岛066004

出　　处：《北京化工大学学报（自然科学版）》2020年第2期8-16,共9页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家重点研发计划(2017YFD0801503);中央高校基本科研业务费(PT1906);秦皇岛海洋经济创新发展示范项目。

摘　　要：以外源添加重金属污染物镉(Cd)、铅(Pb)的酸性黄棕壤为研究对象,考察镁渣对污染土壤中Cd、Pb的稳定化效果。镁渣采用硫酸和磷酸二氢钾两种改性手段进行处理,运用X射线衍射分析仪(XRD)、傅里叶变换红外光谱仪(F T-IR)、比表面积分析仪(BET)、扫描电子显微镜(SEM)等表征手段对改性前后的镁渣进行分析。将镁渣以1%、3%、5%的添加量(质量分数)加入到Cd、Pb污染的土壤中,采用二乙三胺五乙酸(DTPA)浸提法和改进的Community Bureau of Reference(BCR)连续提取法研究镁渣对土壤Cd、Pb生物有效态和赋存形态的影响,为镁渣应用于土壤Cd、Pb的稳定化修复提供理论依据。结果表明:通过改性处理可以显著提高镁渣的比表面积,其中盐改性镁渣比表面积最大为80.65 m^2/g。在稳定化实验中,未改性镁渣、酸改性镁渣、盐改性镁渣均可提升土壤pH值,并显著降低土壤中生物有效态Cd、Pb含量。对土壤中Cd、Pb赋存形态进行分析,发现添加未改性镁渣、盐改性镁渣可显著降低酸提取态Cd含量,将酸提取态Cd向可还原态和可氧化态转化;添加盐改性镁渣可显著降低酸提取态和可还原态Pb含量,将酸提取态和可还原态Pb向可氧化态和残渣态转化。添加1%未改性镁渣时,污染土壤中Cd稳定化效果最好,Cd迁移能力最低;添加5%盐改性镁渣时,污染土壤中Pb稳定化效果最好,Pb迁移能力最低。Soil contaminated by heavy metals can cause phytotoxicity and risks to humans through the food chain.In this work the stabilizing effects of magnesium slag on Cd and Pb in acidic yellow brown soil with the exogenous heavy metal pollutants cadmium(Cd)and lead(Pb)were investigated.X-ray diffraction analysis(XRD),Fourier transform infrared spectroscopy(FT-IR),specific surface area analysis(BET),scanning electron microscopy(SEM)and other methods were used to characterize the magnesium slag before and after modification.Mass fractions of magnesium slag of 1%,3%,and 5%were added to soil samples contaminated by Cd and Pb.The diethylenetriamine pentaacetic acid(DTPA)extraction method and the continuous extraction method from the enhanced Community Bureau of Reference(BCR)were used to study the effect of magnesium slag on the bioavailability and form of soil Cd and Pb,so as to provide a theoretical basis for the application of magnesium slag in the stabilization and remediation of soil Cd and Pb.The results show that the specific surface area of magnesium slag can be significantly increased by modification,and the maximum specific surface area of salt-modified magnesium slag was 80.65 m^2/g.In the stabilization experiments,unmodified magnesium slag,acid-modified magnesium slag and salt-modified magnesium slag were found to increase soil pH and significantly reduce the content of bioavailable Cd and Pb in the soil.By analyzing the forms of Cd and Pb in the soil,it was found that the addition of unmodified magnesium slag and salt-modified magnesium slag significantly reduced the content of acid-extracted Cd and transformed acid-extracted Cd into reducible and oxidizable states,while salt-modified magnesium slag significantly reduced the content of acid-extracted and reducible Pb,and transformed acid-extracted and reducible Pb into oxidizable and residual states.Stabilization of Cd in the contaminated soil was maximized when 1%unmodified magnesium slag was added,and the migration capacity of Cd was the lowest.Stabilization o

关 键 词：镁渣 污染土壤 CD污染 PB污染 稳定化 

分 类 号：X53[环境科学与工程—环境工程]