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A passivating agent for repairing heavy metal polluted farmland soil and its application method

An application method and technology of passivating agent, applied in the field of soil remediation, can solve problems such as abnormally complex remediation work of heavy metals, and achieve the effect of reducing bioavailability and migration ability, long-lasting and stable passivation effect, and strong stability

Active Publication Date: 2021-08-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The complexity of heavy metal substances in soil and the differences in soil space make heavy metal remediation extremely complicated

Method used

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  • A passivating agent for repairing heavy metal polluted farmland soil and its application method
  • A passivating agent for repairing heavy metal polluted farmland soil and its application method
  • A passivating agent for repairing heavy metal polluted farmland soil and its application method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: pot experiment

[0044] 1.1 Experimental design

[0045] There are 14 treatment groups in this pot experiment, as shown in Table 1. Specific experimental steps: First, weigh the passivating agent montmorillonite and humic acid in proportion, then add montmorillonite to the cadmium-contaminated farmland soil, mix well with the soil, and after 24 hours, add humic acid to the farmland soil in proportion acid sensitive. Pay attention to the use of weighing method to maintain the water content of 60-80% of the soil, take samples after 7 days of cultivation, air-dry and grind them through 100 mesh for later use, measure the soil pH, the content of available cadmium, and calculate the reduction rate of available cadmium. The addition levels of passivators are shown in Table 1. The total cadmium content was 0.959mg / kg, the initial effective cadmium content in Cd-polluted soil was 0.381mg / kg, and the pH was 7.05. At the same time, the treatment groups without a...

Embodiment 2

[0063] Embodiment 2: field experiment

[0064] 2.1 Experimental design

[0065] This kind of passivating agent addition method is applied in the field test, and several groups of treatment (being respectively: 0.3% montmorillonite+0.3% humic acid; 0.3% montmorillonite+0.3% montmorillonite+ 0.6% humic acid; 3% montmorillonite + 8% humic acid; 5% montmorillonite + 5% humic acid; 5% montmorillonite + 8% humic acid), the addition level of passivating agent is shown in the table 3. First add montmorillonite to the soil, make it fully mixed with the soil, wait for it to react with the soil for 24 hours, then add humic acid to the soil, sprinkle the soil passivation agent evenly on the surface soil, and fully mix with the soil Evenly, then plow, then add water so as not to cover the soil surface, water in good time to ensure that the soil is in a moist state, and the humidity is controlled at 60-80%. After equilibrating for 5 days, take samples, measure soil pH and available cadmi...

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Abstract

The invention discloses a passivating agent for repairing heavy metal-contaminated farmland soil and an application method thereof. The passivating agent is montmorillonite and humic acid, and discloses an application method of the passivating agent for repairing heavy metal-contaminated farmland soil. It is only necessary to apply montmorillonite to the remediation soil in proportion, mix it well with the soil, react for a period of time, then add humic acid to the soil in proportion, fully mix it with the soil and keep it for a period of time, then you can Effectively reduce the effective state Cd concentration of heavy metal-contaminated farmland soil, and adopt the passivator of the present invention to be applied to repair farmland soil polluted by heavy metals, especially neutral and slightly alkaline farmland soil, which can effectively reduce the bioavailability and Migration ability, good repair effect, strong stability, simple and controllable operation, good economic benefits, and the content of effective heavy metals in the soil after repair is lower than the national standard, with industrial production conditions and broad application prospects.

Description

technical field [0001] The invention relates to a novel passivator for repairing heavy metal polluted farmland soil and an application method thereof, belonging to the field of soil repair. Background technique [0002] Soil quality is an important material basis for the sustainable development of society and economy. With the acceleration of China's industrialization process and the rapid development of society and economy, the problems of farmland soil pollution and quality decline have become increasingly prominent. Heavy metal pollution in farmland is an environmental problem of great concern at home and abroad. When heavy metals accumulate in the soil to a certain extent, they will not only cause ecological problems with the loss of soil fertility, but also affect the quality and quality of crop products, enter the human body through the food chain, and affect human health. The situation of heavy metal pollution in farmland is severe, and the control of heavy metal pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 缪璐薇牟海燕陈文清黄武吴晨炜万娟薛哲
Owner SICHUAN UNIV
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