Remediation of Farmland Soil Contained Cd and As Based on Plant Rotation Pattern with Compound Passivator Application

ZHANG Hongjuan; WU Lan; MENG Xiangmin; XU Duo; YIN Xianqiang

doi:10.13870/j.cnki.stbcxb.2022.05.046

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Remediation of Farmland Soil Contained Cd and As Based on Plant Rotation Pattern with Compound Passivator Application

更新时间：2025-03-12

- Remediation of Farmland Soil Contained Cd and As Based on Plant Rotation Pattern with Compound Passivator Application
- Vol. 36, Issue 5, Pages: 377-386(2022)
- 作者机构：
  
  1. 杨凌职业技术学院生物工程分院, 陕西杨凌,712100
  2. 西北农林科技大学资源环境学院, 陕西杨凌,712100
  3. 山东省菏泽市成武县委政法委员会,山东,菏泽,274200
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.05.046
  CLC： X53
- Published：2022
- 稿件说明：
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ZHANG Hongjuan, WU Lan, MENG Xiangmin, et al. Remediation of Farmland Soil Contained Cd and As Based on Plant Rotation Pattern with Compound Passivator Application[J]. 2022, 36(5): 377-386.
DOI：

ZHANG Hongjuan, WU Lan, MENG Xiangmin, et al. Remediation of Farmland Soil Contained Cd and As Based on Plant Rotation Pattern with Compound Passivator Application[J]. 2022, 36(5): 377-386. DOI： 10.13870/j.cnki.stbcxb.2022.05.046.

摘要

镉(Cd)和砷(As)是土壤环境中广泛存在的重金属污染物

具有不可降解性和生物累积性的特点

应及时开展Cd和As污染的修复工作。研究以湖南中、轻度Cd和As污染农田土壤为对象

选取当地优势植物。通过田间试验

添加生物炭与纳米零价铁的复合钝化剂

利用不同植物(油菜-蚕豆、玉米-苎麻)配套种植模式

探讨基于复合钝化剂施用植物轮作模式对土壤中Cd和As污染的修复效果。结果表明:(1)间作种植模式(蚕豆-油菜、玉米-苎麻)更有利于土壤中Cd和As的固定

试验土壤中Cd和As的最佳固定效果依次为原供试土壤的45.19%和19.00%。(2)复合钝化剂可显著提升农田土壤中Cd和As的固定效果

当生物炭和纳米零价铁以53∶1的比例混合配施时

Cd和As的钝化效果最为明显。(3)在间作模式下施加复合钝化剂

可以有效促进Cd和As污染土壤的修复。研究认为此类方式更适合中、轻度Cd和As复合污染土壤的修复工程应用。复合钝化剂最佳配比及植物间作模式的使用为Cd和As复合污染土壤的修复与治理工作提供试验依据和理论支撑。

Abstract

Cadmium (Cd) and arsenic (As) are the dominant heavy metal pollutants widely existing in the soil environment

which have the characteristics of non-degradability and bioaccumulation. Therefore

remediation of Cd and As pollution should be carried out in time. The study took the farmland soil polluted by medium and light Cd and As in Hunan Province as the object

and selected the local dominant plants. In the field experiment

the compound passivator of biochar and nano-zero-valent iron were added

and the matching planting modes of different plants (rape-broad bean and corn-ramie) were used

and the through the field experiment

the remediation effect of plant rotation and the application of compound passivator on Cd and As pollution in soil was explored. The results showed that: (1) The plant rotation models (fava bean-rapeseed

corn-ramie) were more favorable to the fixation of Cd and As in the soil

and the best fixation effect of Cd and As in the test soil was 45.19% and 19.00% of the original soil

respectively. (2) The compound passivator significantly enhanced the fixation of Cd and As in agricultural soil. The passivation effects on Cd and As were the most obvious when biochar and nano-zero-valent iron were applied in the ratio of 53∶1. (3) Applying compound passivators in intercropping mode could effectively promote the remediation effect of Cd and As contaminated soil. This method was more suitable for the application of remediation engineering of moderate and light Cd and As contaminated soil. The optimal ratio of compound passivators and the use of intercropping pattern provide an experimental basis and theoretical support for the remediation and treatment of Cd and As contaminated soil.

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