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农学学报

农学学报 ›› 2023, Vol. 13 ›› Issue (3): 65-70.doi: 10.11923/j.issn.2095-4050.cjas2021-0206

• 土壤肥料/资源环境/生态 • 上一篇    下一篇

基于MSC-IDA的土壤重金属镉污染移除净化技术研究

刘倩1,2(), 李爱霞1,2, 张艳青1   

  1. 1 济源市环境科学研究所，河南济源 459000
    2 河南省土壤重金属污染监测与修复重点实验室，河南济源 459000
  • 收稿日期:2021-12-01 修回日期:2021-12-22 出版日期:2023-03-20 发布日期:2023-04-04
  • 作者简介:

    刘倩，女，1983年出生，河南济源人，工程师，本科，研究方向：环境科研、土壤重金属污染治理及修复。通信地址：459000 河南省济源市汤帝南路868号 济源市环境科学研究所，Tel：0391-6961875，E-mail：。

Study on Removal and Purification Technology of Soil Cadmium Based on MSC-IDA

LIU Qian1,2(), LI Aixia1,2, ZHANG Yanqing1   

  1. 1 Jiyuan Environmental Science Research Institute, Jiyuan 459000, Henan, China
    2 Henan Key Laboratory of Monitoring and Remediation in Heavy Metal Polluted Soil, Jiyuan 459000, Henan, China
  • Received:2021-12-01 Revised:2021-12-22 Online:2023-03-20 Published:2023-04-04

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摘要：

受到各种条件的限制，土壤重金属镉污染采用统一净化方案并不能取得最佳治理效果。针对上述问题，提出基于MSC-IDA（磁性固体螯合剂）的土壤重金属镉污染移除净化技术。设计了4种不同的净化方案，设定不同的土壤样本（重金属镉元素含量：0.925、0.642、0.61 mg）、MSC-IDA浓度（0.01、0.05、0.1、0.20 mol/L)、净化时间（时间：0~120 min）、土壤粒径不同（50、100、200目），研究这些方案下的MSC-IDA对土壤重金属镉污染的移除净化效果。结果表明：方案1条件下，在添加MSC-IDA后，3种土壤样本中镉含量均明显减少，其中样本1的去除率最高，为5.22%；方案2发现，在MSC-IDA添加量小于0.1 mol/L时，土壤中镉的去除率随MSC-IDA浓度的增加而增加，但当MSC-IDA含量超过0.1 mol/L之后，上升幅度逐渐趋于平缓，样本1 (Cd: 0.925 mg/kg)去除率>样本2 (Cd: 0.642 mg/kg)>样本3 (Cd: 0.61 mg/kg)。方案3发现，震荡时间与镉的去除率成正比，但是90 min后，镉去除率增长趋于平缓，最后开始下降。方案4发现土壤粒径越大，MSC-IDA的净化效果越好，3种不同样本中，MSC-IDA对样本2(0.642mg/kg)的净化效果最好。

关键词: MSC-IDA, 土壤污染, 镉, 移除效率, 净化

Abstract:

Constrained by various conditions, the unified purification program for removing soil cadmium (Cd) can not achieve the best effect. A novel soil Cd pollution removal and purification technology based on magnetic solid chelator (MSC-IDA) was proposed. We collected three Cd-polluted soil samples (0.925, 0.642 and 0.61 mg/kg), set MSC-IDA concentrations (0.01, 0.05, 0.1 and 0.20 mol/L), purification time (0-120 min) and different soil particle size conditions (50, 100 and 200 mesh), and designed 4 programs to study the removal and purification efficiency of MSC-IDA on soil Cd. The results showed that under program 1, by adding MSC-IDA, the Cd content in the three Cd polluted soil samples decreased significantly, and the Cd removal rate of the first soil sample was the highest of 5.22%. The results of program 2 showed that when the addition amount of MSC-IDA was less than 0.1 mol/L, the removal rate of Cd in soil increased with the increase of MSC-IDA concentration, but when the concentration exceeded 0.1 mol/L, the increase gradually tended to be flat. The Cd removal rate of the first soil sample (Cd: 0.925 mg/kg) was higher than that of the second soil sample (Cd: 0.642 mg/kg) and the third soil sample (Cd: 0.61 mg/kg). The results of program 3 indicated that the shaking time was positively proportional to the removal rate of Cd, but after 90min, the enhancement of Cd removal rate tended to be flat and declining. Program 4 found that the larger the soil particle size, the better the purification effect of MSC-IDA was. To the three Cd-polluted soil samples, MSC-IDA had the best purification effect on the second one (Cd: 0.642mg/kg).

Key words: MSC-IDA, soil pollution, cadmium, removal efficiency, purification