Method for safe production while lossless in-situ remediation of moderately and mildly cadmium-polluted farmland soil

An in-situ repair and safe production technology, applied in the restoration of contaminated soil, etc., can solve problems such as unsuitable for planting paddy fields, unsuitable, tall individuals, etc.

Active Publication Date: 2021-05-14
中山市农产品质量安全检验所 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent document CN101780466A discloses a method for using leguminous shrubs to restore heavy metal cadmium-contaminated soil. The method mainly involves planting Cassia pterygium plants in heavy metal cadmium-contaminated soil, and adding EDTA as a strengthening agent to the soil, and EDTA as a Chemical complexing agents have been proved to have obvious effects, but the secondary pollution problem caused by them cannot be effectively solved; moreover, although Cassia pterygium h

Method used

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  • Method for safe production while lossless in-situ remediation of moderately and mildly cadmium-polluted farmland soil
  • Method for safe production while lossless in-situ remediation of moderately and mildly cadmium-polluted farmland soil
  • Method for safe production while lossless in-situ remediation of moderately and mildly cadmium-polluted farmland soil

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1 A kind of method utilizing paddy rice and field greens intercropping to restore middle and low concentration cadmium polluted farmland soil

[0041] In the middle and low concentration cadmium-contaminated paddy field of Tangxin Village, Wengyuan County, Shaoguan City, which is located in the subtropical region, an experiment was carried out to remediate the medium-low concentration cadmium-contaminated paddy field soil by intercropping rice and field greens. Due to the long-term impact of heavy metal sewage in the Dabaoshan mining area, this area has become cadmium-contaminated soil. After multi-point sampling and testing, the cadmium content of the soil in the test field is 0.72mg / kg. The test field was originally a paddy field. After clearing the weeds and soaking the soil in March 2019, the farmland soil was plowed 5-10 days before transplanting. The plowing depth was 15-20cm, and then the test began in April 2019. Carry out intercropping of cadmium-low...

Embodiment 2

[0058] Embodiment 2 A kind of method utilizing intercropping of paddy rice and field greens to remediate the farmland soil polluted by medium and low concentration cadmium

[0059] In the middle and low concentration cadmium-contaminated paddy field of Tangxin Village, Wengyuan County, Shaoguan City, which is located in the subtropical region, an experiment was carried out to remediate the medium-low concentration cadmium-contaminated paddy field soil by intercropping rice and field greens. Due to the long-term impact of heavy metal sewage in the Dabaoshan mining area, this area has become cadmium-contaminated soil. After multi-point sampling and testing, the cadmium content of the soil in the test field is 1.20mg / kg. The test field was originally a paddy field. After clearing the weeds and soaking the soil in March 2019, the farmland soil was plowed 7 days before transplanting. The plowing depth was 15-20 cm, and the soil moisture content was kept at 85% of the field water cap...

Embodiment 3

[0068] Example 3 A method of using intercropping of rice and field greens to remediate medium and low concentration cadmium-contaminated farmland soil

[0069] In the middle and low concentration cadmium-contaminated paddy field of Tangxin Village, Wengyuan County, Shaoguan City, which is located in the subtropical region, an experiment was carried out to remediate the medium-low concentration cadmium-contaminated paddy field soil by intercropping rice and field greens. Due to the long-term impact of heavy metal sewage in the Dabaoshan mining area, this area has become cadmium-contaminated soil. After multi-point sampling and testing, the cadmium content of the soil in the test field is 1.20mg / kg. The test field was originally a paddy field. After clearing the weeds and soaking the soil in March 2019, the farmland soil was plowed 7 days before transplanting. The plowing depth was 15-20 cm, and the soil moisture content was kept at 85% of the field water capacity. , plowing bro...

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Abstract

The invention discloses a method for safe production while lossless in-situ remediation of moderately and mildly cadmium-polluted farmland soil. According to the method, rice and sesbania are planted in an intercropping mode, and 1-2 rows of sesbania are intercropped every 3-4 rows of rice; a nitrogen-phosphorus-potassium compound fertilizer and an organic fertilizer are dressed for promoting the growth of rice and sesbania; in the remediation period, the water content of the field soil is kept at 70%-100%; and after the rice is mature, the rice and sesbania are harvested at the same time. According to the method, the yield of rice can be stable or obviously increased, the cadmium content in grains is lower than the national food safety standard, meanwhile, efficient extraction of cadmium from sesbania is promoted, and thus the purpose of safe production while lossless in-situ remediation is achieved. The method does not need additional additives, does not destroy the soil structure and composition, does not cause secondary pollution, has the advantages of wide applicability, high efficiency, small engineering quantity, short treatment period, low cost and the like, and is suitable for treating the moderately and mildly cadmium-polluted farmland soil.

Description

technical field [0001] The invention belongs to the technical field of heavy metal polluted soil treatment. Specifically, it relates to a method for safe production while non-destructive in-situ restoration of medium-light cadmium-contaminated farmland soil. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace harmful elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as zinc (Zn) and copper with certain toxicity. (Cu), nickel (Ni) and other elements. Heavy metal pollution in soil mainly comes from pesticides, wastewater, sludge and atmospheric deposition, etc. For example, mercury mainly comes from mercury-cont...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/105
Inventor 张定煌康智明叶少媚陈玮桢黎华寿龚茂健贾晓菲张益文
Owner 中山市农产品质量安全检验所
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