微生物作用下土壤中水溶态Cr(Ⅵ)的迁移转化

王雯璇; 陈晓彤; 章雨晨; 吴广毅; 廖瑜亮; 杨金燕

doi:10.13205/j.hjgc.202006007

微生物作用下土壤中水溶态Cr(Ⅵ)的迁移转化

doi: 10.13205/j.hjgc.202006007

四川大学建筑与环境学院, 成都 610227

详细信息

作者简介:
王雯璇(1999-),女,本科,主要研究方向为土壤中铬污染修复治理。325088818@qq.com

通讯作者:
杨金燕(1977-),女,博士,教授,主要研究方向为土壤中重金属的迁移转化。yanyang@scu.edu.cn

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出版历程
- 收稿日期: 2020-03-21

SIMULATION EXPERIMENT OF TRANSPORT AND TRANSFORMATION OF WATER-SOLUBLE Cr(Ⅵ) IN SOIL UNDER THE ACTION OF MICROORGANISM

College of Architecture and Environment, Sichuan University, Chengdu 610227, China

摘要

摘要: 现代工业的发展使Cr(Ⅵ)土壤污染问题日益突出,针对Cr(Ⅵ)土壤污染防治的相关研究逐渐引起广泛重视。选取低风险地块土壤为实验材料,以土柱淋滤实验为基础,探究在混合芽孢杆菌的作用下,土壤中水溶态Cr(Ⅵ)的迁移和转化。结果表明:水溶态Cr(Ⅵ)在土壤中的迁移动力来源于土壤中水分的迁移。在对照组中,土壤中水溶态Cr(Ⅵ)的迁移呈现出随着土壤深度增加浓度下降的趋势;在混合芽孢杆菌处理组中,芽孢杆菌在前期(0~10 d)会阻碍Cr(Ⅵ)的迁移,在中后期(10~30 d)阻碍作用减弱。在迁移的过程中,混合芽孢杆菌的作用使土壤中水溶态Cr(Ⅵ)的浓度降低,例如土柱淋滤30 d后,175-H土柱相比于175-D土柱在5,10,15,20 cm深度处土壤的水溶态Cr(Ⅵ)浓度分别降低了3.55,2.03,1.87,1.31 mg/kg。同时,淋滤含Cr(Ⅵ)溶液使土壤中铬耐性菌的相对丰度有所增加,例如芽孢杆菌。
- 土壤 /
- 水溶态六价铬 /
- 混合芽孢杆菌 /
- 迁移 /
- 转化
Abstract: The development of modern industry caused Cr(Ⅵ) soil pollution increasingly prominent. The researches on the prevention and control of soil pollution with Cr(Ⅵ) attracted more and more attention. This study selected the low-risk plot soil as the experiment material. Based on soil column leaching experiments, the migration and transformation of water-soluble Cr(Ⅵ) in the soil under the action of mixed Bacillus were investigated. The results showed that the water-soluble Cr(Ⅵ) migration in soil was motivated by the migration of water in soil. In the control group, the migration of water-soluble Cr(Ⅵ) in the soil showed a trend of decreasing concentration with increasing soil depth; in the mixed Bacillus treatment group, Bacillus hindered water-soluble Cr(Ⅵ) migration in the early stage(0~10 days), but had little effect in the middle and later stage(10~30 days). During the migration process, the effect of mixing Bacillus made soil water soluble Cr(Ⅵ) concentration reduced. For example, after 30 days of soil column leaching, the water-soluble Cr(Ⅵ) concentration of the 175-H soil column compared with the 175-D soil column at the depths of 5, 10, 15, 20 cm were decreased by 3.55, 2.03, 1.87, 1.31 mg/kg. At the same time, the leaching of Cr(Ⅵ)-containing solution increased the relative abundance of chromium-resistant bacteria in the soil, such as Bacillus.
- soil /
- water-soluble hexavalent chromium /
- mixed Bacillus Cohn /
- migration /
- transformation

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