地球化学工程技术修复江西某Pb超标耕地的应用

发布时间：2019-06-20 09:52

【摘要】：为了判别地球化学材料在土壤改良与重金属修复中的作用,本研究以江西龙南某地被稀土采矿废水污染而废弃的农耕地为对象,用黏土矿物等材料组成的三种修复方案对249 km2的废弃地进行修复。一周期后,比较修复前后土壤中重金属生物易迁移态的变化来评价该技术的有效性。结果表明,该地Pb超标程度最重,达101.50 mg·kg-1。Cd、Hg、As次之,分别为0.13 mg·kg-1、0.13 mg·kg-1、2.98 mg·kg-1,均超赣州市土壤背景值含量,超龙南地区土壤Pb的均值,修复目标为Pb。该地土壤中Pb的易迁移态含量与总量不显著相关。经地球化学工程技术修复后,Pb易迁移态降低了3.25%,修复效果明显。一周期后,Pb的易迁移态平均降幅为1.40%,修复效果稳定。修复效果最佳的方案C能使Pb降低幅度达到3.38 mg·kg-1,在经济上体现为最廉价,体现了地球化学工程技术的优势。
[Abstract]:In order to distinguish the role of geochemical materials in soil improvement and heavy metal remediation, the abandoned agricultural farmland polluted by rare earth mining wastewater in Longnan, Jiangxi Province was taken as the object, and three remediation schemes composed of clay minerals were used to repair the abandoned land of 249 km2. After one cycle, the changes of migration state of heavy metals in soil before and after remediation were compared to evaluate the effectiveness of the technique. The results showed that the degree of Pb exceeding the standard was the heaviest, the second was 101.50 mg kg-1.Cd,Hg,As, and the content of soil background value in Ganzhou City was 0.13 mg kg-1,0.13 mg kg-1,2.98 mg kg-1,. The mean value of soil Pb in Chaolongnan area was higher than that in Ganzhou City, and the remediation target was Pb.. There was no significant correlation between the transferable content of Pb in the soil and the total amount. After remediation by geochemical engineering technology, the migration state of Pb decreased by 3.25%, and the repair effect was obvious. After one cycle, the average migration state of Pb decreased by 1.40%, and the repair effect was stable. Scheme C with the best repair effect can reduce Pb by 3.38 mg kg-1, economically, which reflects the advantages of geochemical engineering technology.
【作者单位】：中国地质科学院国家地质实验测试中心;中国地质大学(北京);浙江省地质矿产研究所;北京工业大学;
【基金】：国家公益性行业科研专项(编号:201211078) 中国地质科学院基本科研业务费项目(编号:YYWF201722;YYWF201617)联合资助~~
【分类号】：X53

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