摘要
通过吸附水体中重金属离子、去除土壤重金属浸出毒性及修复重金属形态变化等试验,进行麦饭石对水体和土壤重金属修复效果的研究。结果表明:麦饭石对模拟水体中重金属有一定吸附能力,对铬离子(Cr^(6+))、铅离子(Pb^(2+))、镉离子(Cd^(2+))、锌离子(Zn^(2+))、镍离子(Ni^(2+))、铜离子(Cu^(2+))和砷离子(As^(5+))最大吸附质量分数分别是54.45,63.84,56.22,68.41,56.87,54.78和39.57 mg/kg;对土壤重金属浸出毒性实验(TCLP)溶液中Pb^(2+),Zn^(2+),Cu^(2+)和Cd^(2+)等的最高去除率分别为34.47%,18.93%,21.81%和15.76%;麦饭石能有效去除土壤中重金属Cd的活性形态,促进土壤中重金属Cd从不稳定态向稳定态转化。在模拟条件下经过196 d的化学稳定修复,土壤中重金属Cd的可交换提取态质量分数由22.66%下降至1.63%,其活性明显降低。
In order to study Manfan Stone remediating contaminated by heavy metals in water and soil,we research on the adsorption of heavy metals in water body,leaching toxicity and changing the formation in this study.The result suggested that Manfan Stone had a capacity of adsorption on heavy metals in the simulated conditions.The adsorption of Cr^(6+),Pb^(2+),Cd^(2+),Zn^(2+),Ni^(2+),Cu^(2+)and As5+was 54.45,63.84,56.22,68.41,56.87,54.78,39.57 mg/kg repectively.Manfan Stone can dramatically decreased the leachability of heavy metal,the reduction of Pb^(2+),Zn^(2+),Cu^(2+),Cd^(2+)concentrations in TCLP extraction was34.47%,18.93%,21.81%,15.76%.Compared controlled,the percent reduction of Cd^(2+)concentrations of exchanged form was from22.66%to 1.63%after 196 th day.It was suggested that the Manfan Stone could transform Cd from instable to stable forms.
作者
金晓丹
何俊贺
黄宇钊
卢燕南
梁大成
JIN Xiao-dan;HE Jun-he;HUANG Yu-zhao;LU Yan-nan;LIANG Da-cheng(Environmental Protection Research Institute of Guangxi,Nanning 530022,China)
出处
《环境科技》
2021年第4期23-28,共6页
Environmental Science and Technology
关键词
重金属
土壤
麦饭石
形态
Heavy metals
Soil
Manfan stone
Forms
